High-performance single-component coating type polyurea and preparation method thereof

Abstract

The invention discloses a high-performance single-component coating type polyurea and a preparation method thereof. The high-performance single-component scraping type polyurea coating is prepared from the following main components in parts by weight: 20 to 60 parts of polyol, 10 to 40 parts of isocyanate monomer, 0.01 to 0.15 part of catalyst, 1 to 15 parts of plasticizer, 10 to 20 parts of latent curing agent, 0.3 to 1 part of accelerant, 3 to 6 parts of color paste, 0.3 to 1 part of antioxidant, 2 to 5 parts of ultraviolet light absorber, 0.1 to 0.3 part of defoaming agent and 4 to 6 parts of thixotropic agent. The prepared coating does not contain any solvent, and is high in strength and convenient to construct.

Description

Technical Field

[0001] The present invention relates to the technical field of polyurea waterproof coatings, and more particularly to a high-performance single-component polyurea waterproof coating and a preparation method thereof. Background Art

[0002] Since its invention in the 1980s, polyurea elastomer technology has become a novel, solvent-free, pollution-free, green and environmentally friendly technology, widely used in anti-corrosion, waterproof coatings, and wear-resistant technologies. Polyurea coatings are divided into one-component and two-component polyureas. Two-component polyurea requires expensive spray equipment for on-site application, and water and electricity availability are significantly limited when working in remote areas or at high altitudes. One-component polyurea, on the other hand, is ready to use out of the bucket, offers more stable performance, and is easy to use. Consequently, demand has been increasing in recent years.

[0003] At present, the performance of single-component polyurea in the domestic market is relatively low. In order to reduce viscosity and facilitate construction, diluents such as organic solvents are often added to single-component polyurea coatings. The addition of solvents will not only cause varying degrees of harm to human health, but also significantly reduce the strength of the material. With the increasingly rapid development of large-scale underground projects, subways and tunnels, the demand for high-performance polyurea coatings is also increasing.

[0004] The high-performance one-component scraping-off polyurea of ​​the present invention does not require any solvent to be added, is easy to construct, and has excellent physical properties. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-performance one-component scraping-off polyurea and a preparation method thereof.

[0006] The technical solution adopted by the present invention is: a high-performance one-component scraping polyurea and a preparation method thereof, which is characterized by comprising the synthesis of a one-component polyurea prepolymer and the mixing of a latent curing agent, a catalyst, an ultraviolet absorber, an antioxidant and a thixotropic agent.

[0007] Furthermore, the high-performance one-component scraping polyurea and its preparation method are characterized in that: the synthesis method of the one-component polyurea prepolymer is characterized in that: the isocyanate monomer is 11-40 parts, the polyol is 20-60 parts, the catalyst is 0.01-0.15 parts, the plasticizer is 1-15 parts, the latent curing agent is 10-20 parts, the accelerator is 0.3-1 parts, the color paste is 3-6 parts, the antioxidant is 0.3-1 parts, the ultraviolet absorber is 2-5 parts, the defoaming agent is 0.1-0.3 parts, the leveling agent is 0.1-0.3, and the thixotropic agent is 4-6 parts.

[0008] Most preferably, the high-performance one-component scraping polyurea and its preparation method include the following components in parts by weight: 28 parts of isocyanate monomer, 48 parts of polyol, 0.04 parts of catalyst, 4 parts of plasticizer, 13 parts of latent curing agent, 0.4 parts of accelerator, 4 parts of color paste, 0.4 parts of antioxidant, 2 parts of ultraviolet absorber, 0.1 parts of defoaming agent, and 0.1 parts of leveling agent.

[0009] The diisocyanate is selected from at least one of dicyclohexylmethane diisocyanate and isophorone diisocyanate.

[0010] The polyol is selected from at least one of polytetramethylene glycol, polycaprolactone triol and polyether polyol.

[0011] The present invention also provides a method for preparing the above-mentioned high-performance one-component scraping-off polyurea, comprising the following steps: a. First, vacuum dehydrate the polyol, plasticizer, and color paste, maintaining the temperature between 105-120℃ and the vacuum degree of 0.01-0.05MPa for 2.5 hours, and then cool to 80℃.

[0012] b. Add isocyanate to a, raise the temperature to 80-85°C, keep warm for 1 hour, then reduce to 60°C, add catalyst, raise the temperature to 80-85°C, keep warm for 1.5 hours, then reduce to 80°C, then add accelerator, add latent curing agent after 10 minutes, and react at 80°C for 1 hour.

[0013] c. Add defoamer, ultraviolet absorber and antioxidant to b, stir and mix well.

[0014] d. Pour the evenly mixed material in step c into a suitable container, add thixotropic agent, increase the stirring speed, and stir for 10-15 minutes before discharging the material.

[0015] The present invention provides a high-performance, one-component scraping-off polyurea and a method for preparing the same. The one-component polyurea is solvent-free, high in solids, and exhibits excellent physical and chemical properties. It is also easy to apply, requiring no spraying equipment and ensuring ease of operation. Furthermore, the one-component polyurea exhibits no discoloration or chalking during long-term outdoor use. DETAILED DESCRIPTION

[0016] The present invention will be further described in detail below with reference to specific embodiments. Example

[0017] A high-performance one-component scraping-off polyurea and a preparation method thereof, comprising the following components in parts by weight: 25 parts of 4,4'-dicyclohexylmethane diisocyanate (HMDI), 25 parts of polytetramethylene glycol PTMG1000, 20 parts of polytetramethylene glycol PTMG1000, 0.04 parts of environmentally friendly catalyst WP01, 4 parts of plasticizer PC, 14 parts of latent curing agent 366B, 0.5 parts of accelerator 002, 4 parts of color paste, 0.4 parts of antioxidant B-215, 2 parts of ultraviolet absorber UV-329, 0.1 parts of defoamer A530, 3 parts of thixotropic agent fumed silica, and 2 parts of bentonite.

[0018] A method for preparing a high-performance one-component scraping-off polyurea is as follows: a. First, vacuum dehydrate 45 parts of polytetramethylene glycol, 4 parts of PC, and 4 parts of color paste. Maintain the temperature between 105-120℃ and the vacuum degree of 0.01-0.05MPa for 2.5 hours, then cool to 80℃.

[0019] b. Add 25 parts of HMDI to a, raise the temperature to 80-85°C, keep warm for 1 hour, then reduce to 60°C, add catalyst, raise the temperature to 80-85°C, keep warm for 1.5 hours, then reduce to 80°C, then add 0.5 parts of accelerator, add 14 parts of 366B after 10 minutes, and react at 80°C for 1 hour.

[0020] c. Add 0.1 parts of A530, 2 parts of UV-329 and 0.4 parts of B-215 to b, stir and mix well.

[0021] d. Pour the evenly mixed material in c into a suitable container, add a thixotropic agent, increase the stirring speed, stir for 10-15 minutes and then discharge the material to obtain a high-performance one-component polyurea coating.

[0022] The product of this embodiment was tested by sample preparation: The liquid sample of Example 1 was taken out and coated on a flat release paper to a wet film thickness of about 1.5-2.5 mm. The sample was cured at room temperature for about 7 days and then removed for sample cutting and testing.

[0023] After testing, its mechanical properties are: tensile strength 13MPa, elongation at break 450%, tear strength 58KN / m, and hardness 85A. Example

[0024] A high-performance one-component scraping-off polyurea and a preparation method thereof, comprising the following components in parts by weight: 28 parts of 4,4'-dicyclohexylmethane diisocyanate (HMDI), 48 parts of polytetramethylene glycol PTMG2000, 0.04 parts of environmentally friendly catalyst WP01, 4 parts of plasticizer PC, 13 parts of latent curing agent 366B, 0.4 parts of accelerator 002, 4 parts of color paste, 0.4 parts of antioxidant B-215, 2 parts of ultraviolet absorber UV-329, 0.1 parts of defoamer A530, and 0.1 parts of leveling agent 1484.

[0025] A method for preparing a high-performance one-component scraping-off polyurea is as follows: a. First, vacuum dehydrate 48 parts of polytetramethylene glycol, 4 parts of PC, and 4 parts of color paste. Maintain the temperature between 105-120℃ and the vacuum degree of 0.01-0.05MPa for 2.5 hours, then cool to 80℃.

[0026] b. Add 28 parts of HMDI to a, raise the temperature to 80-85°C, keep warm for 1 hour, then reduce to 60°C, add catalyst, raise the temperature to 80-85°C, keep warm for 1.5 hours, then reduce to 80°C, then add 0.4 parts of accelerator, add 13 parts of 366B after 10 minutes, and react at 80°C for 1 hour.

[0027] c. Add 0.1 parts of A530, 2 parts of UV-329 and 0.4 parts of B-215 to the mixture of b, stir for 30 minutes and then discharge the mixture to obtain a high-performance one-component polyurea coating.

[0028] The product of this embodiment was tested by sample preparation: The liquid sample of Example 2 was taken out and coated on a flat release paper to a wet film thickness of about 1.5-2.5 mm. It was cured at room temperature for about 7 days and then removed for sample cutting and testing.

[0029] After testing, its mechanical properties are: tensile strength 17MPa, elongation at break 410%, tear strength 90KN / m, and hardness 92A. Example

[0030] A high-performance one-component scraping-off polyurea and a preparation method thereof, comprising the following components in parts by weight: 30.8 parts of 4,4'-dicyclohexylmethane diisocyanate (HMDI), 26 parts of polyether polyol 2000, 26 parts of polyether polyol 1000, 3 parts of polyether polyol DV-125, 0.04 parts of catalyst WP01, 10 parts of latent curing agent 2142, 4 parts of chain extender FT-6270, 0.1 parts of defoaming agent A530, and 0.1 parts of leveling agent 1484.

[0031] A method for preparing a high-performance one-component scraping-off polyurea is as follows: a. First, vacuum dehydrate 55 parts of polyether polyols, maintain the temperature between 105-120℃, the vacuum degree is 0.01-0.05MPa, the time is 2.5 hours, and then cool to 80℃.

[0032] b. Add 30.8 parts of HMDI to a, raise the temperature to 80-85°C, keep warm for 1 hour, then reduce the temperature to 60°C, add the catalyst, raise the temperature to 80-85°C, keep warm for 1.5 hours, then reduce the temperature to 80°C, then add 10 parts of 2142, and react at 80°C for 1 hour.

[0033] c. Add 0.1 parts of A530, 0.1 parts of 1484, and 4 parts of FT-6270 to the mixture of b, stir for 30 minutes, and then discharge the mixture to obtain a high-performance one-component polyurea coating.

[0034] The product of this embodiment was tested by sample preparation: The liquid sample of Example 3 was taken out and coated on a flat release paper to a wet film thickness of about 1.5-2.5 mm. It was cured at room temperature for about 7 days and then removed for sample cutting and testing.

[0035] After testing, its mechanical properties are: tensile strength 16MPa, elongation at break 390%, tear strength 80KN / m, and hardness 92A.

Claims

1. A high performance one-component scraping polyurea coating, characterized in that The quality components include the following: 20-60 parts of polyol; 10-40 parts of isocyanate monomer; 0.01-0.15 parts of catalyst; 1-15 parts of plasticizer; 10-20 parts of latent curing agent; Accelerator 0.3-1 part; 3-6 parts of color paste; 0.3-1 part of antioxidant; 2-5 parts of ultraviolet absorber; Defoaming agent 0.1-0.3 parts; 4-6 parts of thixotropic agent.

2. The high-performance one-component scraping polyurea coating according to claim 1, characterized in that: The isocyanate monomer is at least one of 4,4'-dicyclohexylmethane diisocyanate and isophorone diisocyanate.

3. The high-performance one-component scraping polyurea coating according to claim 1, characterized in that: The polyol is at least one of polytetramethylene ether glycol, polycaprolactone polyol and polyether polyol.

4. The high-performance one-component scraping polyurea coating according to claim 1, characterized in that: The catalyst is an environmentally friendly catalyst.

5. The high-performance one-component scraping-off polyurea coating according to claim 1, characterized in that: The accelerator is a binary complex organic acid, which is mainly used as a catalyst in combination with a latent curing agent.

6. A method for preparing a high-performance one-component scraping-off polyurea, characterized in that: The following steps are involved: ① First, vacuum dehydrate the polyol, plasticizer, and color paste, maintain the temperature between 105-120℃, the vacuum degree of 0.01-0.05MPa, and the time for 2.5 hours, and then cool to 60℃. ② Add isocyanate to a, raise the temperature to 80-85℃, keep warm for 2.5h, then reduce the temperature to 80℃, then add accelerator, add latent curing agent after 10 minutes, and react at 80℃ for 1 hour. ③ Add defoamer, ultraviolet absorber and antioxidant to b, stir and mix evenly. ④ Pour the evenly mixed material in c into a suitable container, add thixotropic agent, increase the stirring speed, stir for 10-15 minutes and then discharge the material.