Bi-component high-strength high-toughness polyaspartic acid ester polyurea coating and preparation method thereof

Abstract

The invention relates to the technical field of organic synthesis, in particular to a bi-component high-strength and high-toughness polyaspartic acid ester polyurea coating and a preparation method thereof. According to the bi-component high-strength high-toughness polyaspartic acid ester polyurea coating disclosed by the invention, adipic acid polyester polyol and polyisocyanate synthesized prepolymer are used as a curing agent component, and polyaspartic acid ester resin and an organic solvent are used as a component B to prepare bi-component high-strength high-toughness resin; by changing the types and proportions of the polyisocyanate, the polyaspartic acid ester resin and the organic solvent and adjusting the pot life, the surface drying time, the hard drying time and other properties of the material, the material can be suitable for different use conditions, use parts and use places.

Description

Technical Field

[0001] The invention relates to the technical field of organic synthesis, and in particular to a two-component high-strength and high-toughness polyaspartic acid ester polyurea coating and a preparation method thereof. Background Art

[0002] Polyurea is a urea-rich elastomer, which is produced by the reaction of isocyanate components and amino compounds. The coating of this material has the characteristics of continuous and dense, can firmly adhere to the surface of the protected object, and effectively isolate the penetration of water vapor and oxygen, thus providing excellent waterproof and anti-corrosion effects.

[0003] Following aromatic polyurea and aliphatic polyurea, polyaspartic acid ester polyurea is a new type of aliphatic, slow-reacting, controllable polyurea material developed in recent years. Its special molecular structure makes the gel time controllable, and it can be applied by spraying, scraping, and rolling, with good substrate adhesion; it can be cured at low temperatures and is suitable for thick coating construction. It is called the third generation of polyurea. Compared with the first two generations of polyurea, it has the characteristics of adjustable curing time, good coating appearance, sufficient wetting of the substrate, excellent color retention and UV resistance.

[0004] However, the gel time of traditional polyurea reaction is short, which is prone to the following problems:

[0005] 1. Orange peel phenomenon: Due to the rapid reaction speed, the surface of the coating may have an uneven texture;

[0006] 2. Poor interlayer adhesion: Rapid reaction leads to unstable interlayer adhesion of coatings, which may cause peeling and cracking of the coating;

[0007] 3. Short construction interval: Due to the short gel time, the construction interval between coatings is limited;

[0008] 4. Poor wettability: Rapid reaction may cause the polyurea material to be unable to fully wet the substrate surface, thus affecting adhesion;

[0009] 5. High cost: The cost is high because high temperature, high pressure and impact mixing equipment are needed to control the reaction rate.

[0010] Moreover, the service life is too short in complex environments, and while the tensile strength of the film is improved, the elongation at break will decrease, thereby limiting the use of the material.

[0011] In view of this, the present invention provides a two-component high-strength and high-toughness polyurea coating with adjustable application period, good adhesion, high strength and high toughness, and convenient operation, and a preparation method thereof. Summary of the invention

[0012] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a two-component high-strength and high-toughness polyaspartic acid ester polyurea coating and a preparation method thereof.

[0013] To achieve the above object, the technical solution adopted by the present invention is as follows: a two-component high-strength and high-toughness polyaspartic acid ester polyurea coating is composed of the following raw materials in percentage by weight:

[0014] Prepolymer components:

[0015] Adipic acid polyester polyol 20-50 parts;

[0016] Polyisocyanate 10-30 parts

[0017] Resin components:

[0018] Polyaspartic acid resin 10-30 parts

[0019] 10 to 30 parts of organic solvent.

[0020] Furthermore, the adipic acid polyester polyol includes one or more of polyethylene adipate glycol (PEA), polybutylene adipate-1,4-diol (PBA), polyhexanediol adipate-1,6-diol (PHA), polyneopentyl adipate glycol (PNA), polyethylene adipate glycol (PE-BA), polybutylene adipate glycol (PBHA), polybutylene adipate neopentyl glycol (PBNA), and polyhexanediol adipate neopentyl glycol (PHNA).

[0021] Furthermore, the polyisocyanate is an aliphatic isocyanate without a benzene ring structure.

[0022] Further, polyaspartic acid ester resins include F220, F420, F421, F520, 1220, 1420, 1422, One or more of 1520.

[0023] Furthermore, the organic solvent includes any one of ester solvents, ether solvents, ketone solvents, and aromatic hydrocarbon solvents, or a combination of at least two of them.

[0024] A method for preparing a two-component high-strength and high-toughness polyaspartic acid ester polyurea coating. The method for preparing the above-mentioned two-component high-strength and high-toughness polyaspartic acid ester polyurea coating is as follows:

[0025] S1. Preparation of prepolymer components

[0026] Add adipic acid polyester polyol to a reaction kettle equipped with a stirrer, a thermometer and a vacuum device, start stirring, heat to 110-140°C, and remove water by vacuum for 2-3 hours, with a vacuum degree of less than -0.09MPa; cool to below 60°C, add polyisocyanate in multiple times under stirring, and control the reaction temperature to be maintained at 55-65°C; after the addition is completed, heat to 60-90°C, react for 2-5 hours, and obtain a prepolymer component;

[0027] S2. Preparation of resin components

[0028] Adding polyaspartic acid ester resin and organic solvent into a reaction kettle equipped with a stirrer, a thermometer and a vacuum device, stirring and mixing uniformly to obtain a resin component;

[0029] The prepared prepolymer component and resin component are mixed in proportion and cured at room temperature to obtain a high-strength and high-toughness polyurethane resin.

[0030] Furthermore, the weight ratio of the prepolymer component to the resin component is 3-5:2-4.

[0031] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0032] 1. The present invention synthesizes a prepolymer with adipic acid polyester polyol and polyisocyanate, changes the crystallinity of the prepolymer, thereby improving the tensile strength of the material while maintaining the original elongation at break.

[0033] 2. The present invention uses adipic acid polyester polyol and polyisocyanate synthetic prepolymer as curing agent components, and polyaspartic acid ester resin and organic solvent as component B to prepare a two-component high-strength and high-toughness resin. By changing the types and ratios of polyisocyanate, polyaspartic acid ester resin and organic solvent, the material's applicable period, surface drying time, actual drying time and other properties are adjusted, so that it can be suitable for different usage conditions, usage parts and locations.

[0034] 3. Compared with the traditional spray polyurea material, the present invention simplifies the operation process, prolongs the operation time, and reduces the use and labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The present invention is a flow chart of a method for preparing a two-component high-strength and high-toughness polyaspartic acid ester polyurea coating in a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0036] The technical solutions in the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] Embodiment 1

[0038] The two-component high-strength and high-toughness polyaspartic acid ester polyurea coating of the present invention is composed of the following raw materials in percentage by weight:

[0039] Prepolymer components: 30 parts of polyethylene adipate glycol butylene glycol ester diol, 10 parts of hexamethylene diisocyanate

[0040] Resin components: 15 parts of F420 polyaspartic acid resin, 15 parts of butyl acetate

[0041] The two-component high-strength and high-toughness polyaspartic acid ester polyurea coating is prepared according to the following steps:

[0042] S1. Add polyethylene glycol adipate diol to a reaction kettle equipped with a stirrer, a thermometer, and a vacuum pump, heat to 120°C, and remove water in vacuo for 2 hours; cool to 50°C, add hexamethylene diisocyanate in five portions while stirring, and control the reaction temperature to 60°C; after the addition is completed, heat at 60°C for 1 hour and 80°C for 2 hours to obtain a prepolymer component;

[0043] S2, adding polyaspartic acid ester resin and butyl acetate to a reaction kettle equipped with a stirrer, a thermometer, and a vacuum pump, stirring and mixing to obtain a resin component;

[0044] S3. The prepared prepolymer component and resin component are mixed in a weight ratio of 4:3 to obtain a high-strength and high-toughness polyurea material.

[0045] According to the present invention, the high-strength and high-toughness polyurea material prepared according to the embodiment can have a tensile strength of more than 30 MPa and an elongation at break of more than 360%.

[0046] The polyester polyol and polyisocyanate selected in the present invention are both aliphatic compounds, and have better weather resistance and medium resistance than aromatic compounds.

[0047] The curing time of the material of the present invention is related to the specific type and content of the raw materials, and the curing time can be adjusted from a few minutes to tens of minutes. The type or content of polyisocyanate, polyaspartic acid ester resin, and organic solvent is adjusted according to different usage conditions and site requirements to achieve applicability in different situations.

[0048] Embodiment 2

[0049] The two-component high-strength and high-toughness polyaspartic acid ester polyurea coating of the present invention is composed of the following raw materials in percentage by weight:

[0050] Prepolymer components: 30 parts of polyethylene adipate glycol butylene glycol ester diol, 10 parts of hexamethylene diisocyanate;

[0051] 1# resin component: 15 parts of F420 polyaspartic acid resin and 10 parts of butyl acetate.

[0052] 2# resin component: 15 parts of F420 polyaspartic acid resin and 15 parts of butyl acetate.

[0053] 3# resin component: 15 parts of F420 polyaspartic acid resin and 20 parts of butyl acetate.

[0054] The two-component high-strength and high-toughness polyaspartic acid ester polyurea coating is prepared according to the following steps:

[0055] S1. Add polyethylene glycol adipate diol to a reaction kettle equipped with a stirrer, a thermometer, and a vacuum pump, heat to 120°C, and remove water in vacuo for 2 hours; cool to 50°C, add hexamethylene diisocyanate in five portions while stirring, and control the reaction temperature to 60°C; after the addition is completed, heat at 60°C for 1 hour and 80°C for 2 hours to obtain a prepolymer component;

[0056] S2, adding polyaspartic acid ester resin and butyl acetate to a reaction kettle equipped with a stirrer, a thermometer, and a vacuum pump, stirring and mixing to obtain a resin component;

[0057] S3. Mixing the prepared prepolymer component and resin component to obtain a high-strength and high-toughness polyurea material.

[0058] According to the present invention, the high-strength and high-toughness polyurea material prepared in accordance with the embodiment can be prepared by selecting a suitable amount of butyl acetate according to different usage conditions. The specific values ​​are shown in Table 1:

[0059] Table 1 Gel time and surface drying time of high strength and high toughness polyurea materials with different butyl acetate contents

[0060] Polyurea Type Gel time (25℃) / min Surface drying time (25℃) / min 1# 5～15 20～40 2# 15～30 40～60 3# 30～50 70～100

[0061] Embodiment 3

[0062] The two-component high-strength and high-toughness polyaspartic acid ester polyurea coating of the present invention is composed of the following raw materials in percentage by weight:

[0063] Prepolymer components: 30 parts of polyethylene adipate glycol butylene glycol ester diol, 10 parts of hexamethylene diisocyanate;

[0064] 1# resin component: 12.5 parts of 1220 polyaspartic acid resin and 17.5 parts of butyl acetate.

[0065] 2# resin component: 15 parts of F420 polyaspartic acid resin and 15 parts of butyl acetate.

[0066] 3# resin component: 20.5 parts of F221 polyaspartic acid resin and 19.5 parts of butyl acetate.

[0067] The two-component high-strength and high-toughness polyaspartic acid ester polyurea coating is prepared according to the following steps:

[0068] S1. Add polyethylene glycol adipate diol to a reaction kettle equipped with a stirrer, a thermometer, and a vacuum pump, heat to 120°C, and remove water in vacuo for 2 hours; cool to 50°C, add hexamethylene diisocyanate in five portions while stirring, and control the reaction temperature to 60°C; after the addition is completed, heat at 60°C for 1 hour and 80°C for 2 hours to obtain a prepolymer component;

[0069] S2, adding polyaspartic acid ester resin and butyl acetate to a reaction kettle equipped with a stirrer, a thermometer, and a vacuum pump, stirring and mixing to obtain a resin component;

[0070] S3. Mixing the prepared prepolymer component and resin component to obtain a high-strength and high-toughness polyurea material.

[0071] According to the present invention, the high-strength and high-toughness polyurea material prepared in accordance with the embodiment can be prepared by selecting a suitable polyaspartic acid ester resin according to different usage conditions. The specific values ​​are shown in Table 2:

[0072] Table 2 Gel time and surface dry time of different types of high-strength and high-toughness polyurea materials of polyaspartic acid resin

[0073] Polyurea Type Gel time (25℃) / min Surface drying time (25℃) / min 1# 5～15 10～30 2# 15～30 40～60 3# 30～60 80～120

[0074] Under the premise that no conflict occurs, those skilled in the art may freely combine and superimpose the above-mentioned additional technical features.

[0075] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. Two-component high-strength and high-toughness polyaspartic acid ester polyurea coating, characterized in that: It is composed of the following raw materials in percentage by weight: Prepolymer components: Adipic acid polyester polyol 20-50 parts; Polyisocyanate 10-30 parts Resin components: Polyaspartic acid resin 10-30 parts 10 to 30 parts of organic solvent.

2. The two-component high-strength and high-toughness polyaspartic acid ester polyurea coating according to claim 1, characterized in that: The adipic acid polyester polyol includes one or more of polyethylene adipate glycol (PEA), polybutylene adipate-1,4-diol (PBA), polyhexanediol adipate-1,6-diol (PHA), polyneopentyl adipate glycol (PNA), polyethylene adipate glycol (PE-BA), polybutylene adipate glycol (PBHA), polybutylene adipate neopentyl glycol (PBNA), and polyhexanediol adipate neopentyl glycol (PHNA).

3. The two-component high-strength and high-toughness polyaspartic acid ester polyurea coating according to claim 1, characterized in that: The polyisocyanate is an aliphatic isocyanate without a benzene ring structure.

4. The two-component high-strength and high-toughness polyaspartic acid ester polyurea coating according to claim 1, characterized in that: The polyaspartic acid ester resin includes F220, F420, F421, F520, NH 1220, NH1420, NH 1422, One or more of NH 1520.

5. The two-component high-strength and high-toughness polyaspartic acid ester polyurea coating according to claim 1, characterized in that: The organic solvent includes any one of ester solvents, ether solvents, ketone solvents, and aromatic hydrocarbon solvents, or a combination of at least two of them.

6. A method for preparing a two-component high-strength and high-toughness polyaspartic acid ester polyurea coating, characterized in that: The method for preparing the two-component high-strength and high-toughness polyaspartic acid ester polyurea coating according to any one of claims 1 to 5 is as follows: S1. Preparation of prepolymer components Add adipic acid polyester polyol to a reaction kettle equipped with a stirrer, a thermometer and a vacuum device, start stirring, heat to 110-140°C, and remove water by vacuum for 2-3 hours, with a vacuum degree of less than -0.09MPa; cool to below 60°C, add polyisocyanate in multiple times under stirring, and control the reaction temperature to be maintained at 55-65°C; after the addition is completed, heat to 60-90°C, react for 2-5 hours, and obtain a prepolymer component; S2. Preparation of resin components Adding polyaspartic acid ester resin and organic solvent into a reaction kettle equipped with a stirrer, a thermometer and a vacuum device, stirring and mixing uniformly to obtain a resin component; The prepared prepolymer component and resin component are mixed and cured in proportion to obtain a high-strength and high-toughness polyurethane resin.

7. The method for preparing the two-component high-strength and high-toughness polyaspartic acid ester polyurea coating according to claim 6, characterized in that: The weight ratio of the prepolymer component to the resin component is 3-5:2-4.

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