CN117165162A - Preparation method of environment-friendly oily wind power blade coating - Google Patents

Abstract

The invention discloses a preparation method of environmentally friendly oily wind turbine blade coating, which includes the following steps: S1. Add polyaspartate resin A and siloxane oligomer into a reactor, and raise the temperature to 100-120°C. React for 5-6 hours, cool to room temperature, continue to add polyaspartate resin B, pigments, fillers and additives, and disperse at high speed for 1-1.5 hours to prepare component A; S2. Prepare isocyanate curing agent, recorded as B Component; S3. Before use, mix component A and component B to prepare an environmentally friendly oily wind turbine blade coating. All index requirements of the oil-based wind power blade coating prepared by the method of the present invention meet the use requirements of wind power blades, and have extremely low VOC when used, meeting environmental protection requirements.

Description

Preparation method of environmentally friendly oily wind turbine blade coating

Technical field

The invention relates to the technical field of coatings, and in particular to a preparation method of environmentally friendly oily wind turbine blade coatings.

Background technique

Wind energy is a renewable, pollution-free green energy with a very wide range of application fields and huge development potential. As the pace of global energy transformation accelerates, wind energy will become an important part of the future clean energy system. The development of wind energy can not only reduce dependence on fossil fuels and reduce carbon emissions, but also promote the sustainable development of energy. Wind energy can be converted into electrical energy using wind turbines. Wind turbine blades are one of the key core parts of wind turbines. Wind turbine blades have high linear speeds when running, especially at the leading edge. The linear speed can be higher than 100m/s, and they are prone to wear in windy and sandy environments. Therefore, the protection of wind turbine blade surface coatings is extremely important.

At present, the most commonly used blade coatings are solvent-based polyurethane primers and polyurethane topcoats. This type of coating often has a low solid content and uses a lot of organic solvents. Not only does the VOC approach or even exceed the starting point for the consumption tax on coatings, but it also requires multiple coatings. To achieve the required paint film thickness, it dries slowly and the construction cycle is long. The emergence of water-based coatings solves the non-environmental protection problem of solvent-based polyurethane coatings. However, in practical applications, since water-based coatings are more sensitive to the temperature and humidity of the process environment, an open coating environment is not conducive to the drying of water-based coatings and will seriously affect the painting process. Efficiency and coating performance require additional ventilation and baking equipment in the paint shop when used.

Therefore, there is an urgent need to develop a wind turbine blade coating that is environmentally friendly, easy to apply and has excellent performance.

Contents of the invention

Based on the problems existing in the background technology, the present invention provides an environmentally friendly oily wind turbine blade coating preparation method. The various index requirements of the oily wind turbine blade coating prepared by the method of the present invention meet the use requirements of wind turbine blades, and have the characteristics of Extremely low VOC, meeting environmental protection requirements.

The present invention is implemented through the following technical solutions:

A preparation method for environmentally friendly oily wind turbine blade coating, including the following steps:

S1. Add polyaspartate resin A and siloxane oligomer into the reactor, raise the temperature to 100-120°C, react for 5-6 hours, cool to room temperature, and continue to add polyaspartate resin B and Pigments, fillers and additives are dispersed at high speed for 1-1.5 hours to prepare component A;

S2. Prepare isocyanate curing agent, recorded as component B;

S3. Before use, mix component A and component B to prepare an environmentally friendly oily wind turbine blade coating.

Further, in step S1, polyaspartic acid ester resin A is prepared by reacting isophorone diamine and diethyl maleate; the specific operation is: adding isophorone diamine to a reaction kettle with protective gas. in, stir and raise the temperature to 65-80°C, add diethyl maleate dropwise into the reaction kettle, react for 8-25 hours, cool, and obtain polyaspartate resin A.

Further, in step S1, polyaspartate resin B is prepared by the reaction of polyetheramine D230 and diethyl maleate; the specific operation is: add polyetheramine D230 into a reaction kettle with protective gas, stir and Raise the temperature to 65-80°C, add diethyl maleate dropwise into the reaction kettle, react for 8-25 hours, and cool to obtain polyaspartate resin B.

Further, the preparation method of siloxane oligomer in step S1 is as follows: after polysiloxane and deionized water are subjected to a polycondensation reaction at 70-80°C for 5-8 hours, propylene glycol carbonate and 5A molecular sieve are added, and the mixture is heated in vacuum. The temperature is raised to 80-90°C, the by-product alcohol of the condensation polymerization is evaporated, and the 5A molecular sieve is separated to obtain the siloxane oligomer.

Further, the solid content of the siloxane oligomer in step S1 is ≥75%.

Further, the pigment and filler in step S1 is a mixture of titanium dioxide, bentonite and talc powder, wherein the weight ratio of titanium dioxide, bentonite and talc powder is 1:1: (1-2).

Further, the auxiliary agents in step S1 are dispersant, defoaming agent, leveling agent and thixotropic agent; wherein, the weight ratio of dispersing agent, defoaming agent, leveling agent and thixotropic agent is 1: (0.5- 1): (0.5-1): (1-2);

The dispersant is at least one of BYK-110, BYK-9076, SurfynolCT-136, and ECO-2111;

The defoaming agent is at least one of BYK-052N, EFKA 2722, Defom5400, Defom5500 and SF808;

The leveling agent is at least one of BYK390, BYK354, BYK306, Sago 3277, and JH-9565;

The thixotropic agent is at least one of R972, VK, KMT-40, and BYK-40;

Further, in step S1, include 40-60 parts by weight of polyaspartate resin A, 10-15 parts of siloxane oligomer, 40-60 parts of polyaspartate resin B, 20-30 parts of pigments and fillers and 10-20 parts of additives.

Further, in step S2, the isocyanate curing agent is a mixture of HD I trimer and isocyanate curing agent, wherein the weight ratio of HD I trimer and isocyanate curing agent is (2-3): (6-8).

Further, the weight ratio of component A and component B in step S3 is (1-5):1.

Beneficial effects of the present invention:

1. The present invention uses polyaspartate resin as the matrix resin of the coating and high-solid and low-viscosity polyisocyanate as the curing agent to achieve a truly high solid content. The prepared oil-based wind turbine blade coating has extremely low VOC. The VOC content is less than 60g/L, which reduces the emission pressure of construction companies and improves the working environment of workers.

2. The oil-based wind turbine blade coating prepared by the method of the present invention is combined with polyaspartate resin A and polyaspartate resin B to improve the flexibility and impact resistance of the paint film, and is oligomerized by adding siloxane The modification of polyaspartate resin A improves the adhesion, impact resistance and salt spray resistance of the paint film, making the oil-based wind turbine blade coating prepared by the present invention both environmentally friendly and meeting various index requirements. All meet the requirements for the use of wind power blades and can effectively protect the stable operation of wind power blades for a long time.

Detailed ways

The technical solution of the present invention will be further described in detail below with reference to specific examples, but the protection scope of the present invention is not limited to the following examples.

In the examples and comparative examples of the present invention, the polysiloxane is methylpolysiloxane resin, purchased from Hubei New Sihai Chemical Co., Ltd.

Preparation of polyaspartic acid ester resin A: Weigh the raw materials according to the molar ratio of isophorone diamine and diethyl maleate to 0.8:3, and add isophorone diamine to the reactor with protective gas. in, stir and raise the temperature to 80°C, add diethyl maleate dropwise into the reaction kettle, react for 12 hours, evaporate the unreacted diethyl maleate in a thin film, and cool to obtain polyaspartate resin A.

Preparation of polyaspartic acid ester resin B: Weigh the raw materials according to the molar ratio of polyetheramine D230 and diethyl maleate to be 1:3, add polyetheramine D230 into the reaction kettle with protective gas, stir and Raise the temperature to 80°C, add diethyl maleate dropwise into the reaction kettle, react for 12 hours, evaporate the unreacted diethyl maleate in a thin film, and cool to obtain polyaspartate resin B.

Preparation of siloxane oligomer: In parts by weight, 89 parts of polysiloxane and 12 parts of deionized water were subjected to a polycondensation reaction at 80°C for 8 hours, then 20 parts of propylene glycol carbonate and 50 parts of 5A molecular sieve were added. Raise the temperature to 90°C under vacuum, evaporate the condensation polymerization by-product alcohol, and separate out the 5A molecular sieve to obtain siloxane oligomer. The solid content of the siloxane oligomer is 78±2%.

Example 1

The preparation of oily wind turbine blade coating includes the following steps:

S1. Add 50 parts of polyaspartate resin A and 15 parts of siloxane oligomer into the reactor, raise the temperature to 120°C, react for 5 hours, cool to room temperature, and continue to add 50 parts of polyaspartate resin. B. 25 parts of pigments and fillers and 15 parts of additives are dispersed at high speed for 1.5 hours to prepare component A;

Among them, the pigments and fillers are a mixture of titanium dioxide, bentonite and talc powder, and the weight ratio of titanium dioxide, bentonite and talc powder is 1:1:1; the additives include dispersant BYK-110, defoaming agent BYK-052N, leveling Agent BYK390 and thixotropic agent R972, the weight ratio of dispersant, defoaming agent, leveling agent and thixotropic agent is 1:0.8:0.8:1.5;

S2. Mix HD I trimer and isocyanate curing agent evenly. The weight ratio of HD I trimer and isocyanate curing agent is 3:8, which is recorded as component B;

S3. Before use, mix component A and component B according to a weight ratio of 4:1 to prepare an environmentally friendly oil-based wind turbine blade coating.

Example 2

The preparation of oily wind turbine blade coating includes the following steps:

S1. Add 40 parts of polyaspartate resin A and 15 parts of siloxane oligomer into the reactor, raise the temperature to 120°C, react for 5 hours, cool to room temperature, and continue to add 60 parts of polyaspartate resin. B. 25 parts of pigments and fillers and 15 parts of additives are dispersed at high speed for 1.5 hours to prepare component A;

Among them, the pigments and fillers are a mixture of titanium dioxide, bentonite and talc powder, and the weight ratio of titanium dioxide, bentonite and talc powder is 1:1:1; the additives include dispersant BYK-110, defoaming agent BYK-052N, leveling Agent BYK390 and thixotropic agent R972, the weight ratio of dispersant, defoaming agent, leveling agent and thixotropic agent is 1:0.8:0.8:1.5;

S2. Mix HD I trimer and isocyanate curing agent evenly. The weight ratio of HD I trimer and isocyanate curing agent is 3:8, which is recorded as component B;

S3. Before use, mix component A and component B according to a weight ratio of 4:1 to prepare an environmentally friendly oil-based wind turbine blade coating.

Example 3

The preparation of oily wind turbine blade coating includes the following steps:

S1. Add 60 parts of polyaspartate resin A and 15 parts of siloxane oligomer into the reactor, raise the temperature to 120°C, react for 5 hours, cool to room temperature, and continue to add 40 parts of polyaspartate resin. B. 25 parts of pigments and fillers and 15 parts of additives are dispersed at high speed for 1.5 hours to prepare component A;

Among them, the pigments and fillers are a mixture of titanium dioxide, bentonite and talc powder, and the weight ratio of titanium dioxide, bentonite and talc powder is 1:1:1; the additives include dispersant BYK-110, defoaming agent BYK-052N, leveling Agent BYK390 and thixotropic agent R972, the weight ratio of dispersant, defoaming agent, leveling agent and thixotropic agent is 1:0.8:0.8:1.5;

S2. Mix HD I trimer and isocyanate curing agent evenly. The weight ratio of HD I trimer and isocyanate curing agent is 3:8, which is recorded as component B;

S3. Before use, mix component A and component B according to a weight ratio of 4:1 to prepare an environmentally friendly oil-based wind turbine blade coating.

Comparative example 1

The preparation of oily wind turbine blade coating includes the following steps:

S1. Add 100 parts of polyaspartate resin A and 15 parts of siloxane oligomer into the reactor, raise the temperature to 120°C, react for 5 hours, cool to room temperature, and continue to add 25 parts of pigments and fillers and 15 parts of additives , high-speed dispersion for 1.5h to prepare component A;

Among them, the pigments and fillers are a mixture of titanium dioxide, bentonite and talc powder, and the weight ratio of titanium dioxide, bentonite and talc powder is 1:1:1; the additives include dispersant BYK-110, defoaming agent BYK-052N, leveling Agent BYK390 and thixotropic agent R972, the weight ratio of dispersant, defoaming agent, leveling agent and thixotropic agent is 1:0.8:0.8:1.5;

S2. Mix HD I trimer and isocyanate curing agent evenly. The weight ratio of HD I trimer and isocyanate curing agent is 3:8, which is recorded as component B;

S3. Before use, mix component A and component B according to a weight ratio of 4:1 to prepare an environmentally friendly oil-based wind turbine blade coating.

Comparative example 2

The preparation of oily wind turbine blade coating includes the following steps:

S1. Disperse 50 parts of polyaspartate resin A, 50 parts of polyaspartate resin B, 25 parts of pigments and fillers and 15 parts of additives at high speed for 1.5 hours to prepare component A;

Among them, the pigments and fillers are a mixture of titanium dioxide, bentonite and talc powder, and the weight ratio of titanium dioxide, bentonite and talc powder is 1:1:1; the additives include dispersant BYK-110, defoaming agent BYK-052N, leveling Agent BYK390 and thixotropic agent R972, the weight ratio of dispersant, defoaming agent, leveling agent and thixotropic agent is 1:0.8:0.8:1.5;

S2. Mix HD I trimer and isocyanate curing agent evenly. The weight ratio of HD I trimer and isocyanate curing agent is 3:8, which is recorded as component B;

S3. Before use, mix component A and component B according to a weight ratio of 4:1 to prepare an environmentally friendly oil-based wind turbine blade coating.

Comparative example 3

The preparation of oily wind turbine blade coating includes the following steps:

S1. Add 100 parts of polyaspartate resin B and 15 parts of siloxane oligomer into the reactor, raise the temperature to 120°C, react for 5 hours, cool to room temperature, and continue to add 25 parts of pigments and fillers and 15 parts of additives , high-speed dispersion for 1.5h to prepare component A;

Among them, the pigments and fillers are a mixture of titanium dioxide, bentonite and talc powder, and the weight ratio of titanium dioxide, bentonite and talc powder is 1:1:1; the additives include dispersant BYK-110, defoaming agent BYK-052N, leveling Agent BYK390 and thixotropic agent R972, the weight ratio of dispersant, defoaming agent, leveling agent and thixotropic agent is 1:0.8:0.8:1.5;

S2. Mix HDI trimer and isocyanate curing agent evenly. The weight ratio of HDI trimer and isocyanate curing agent is 3:8, which is recorded as component B;

S3. Before use, mix component A and component B according to a weight ratio of 4:1 to prepare an environmentally friendly oil-based wind turbine blade coating.

The oily wind turbine blade coatings in the examples and comparative examples were used to prepare paint films with a thickness of 250 μm, and were tested according to the test standards. The test comparison results are shown in Tables 1 and 2.

Table 1 Example performance data

Table 2 Comparative performance data

It can be seen from the results in Table 1 that all index requirements of the oily wind turbine blade coatings prepared in Examples 1-3 of the present invention meet the use requirements of wind turbine blades, and the oily wind turbine blades prepared using the present invention have extremely low VOC. The content is less than 60g/L, meeting environmental protection requirements. In Comparative Example 1, all polyaspartic acid ester resin A was used, and the prepared paint was prepared into a paint film. Its tensile strength was significantly improved, but the elongation at break and flexibility were significantly reduced, and the wear resistance of the paint film was It also decreased accordingly. The tack drying time of the paint film in Comparative Example 1 is ≤0.5, the pot life is short, and it is not suitable for construction. In Comparative Example 2, no siloxane oligomer was used, and the prepared coating was prepared into a paint film. Its adhesion and impact resistance were significantly reduced, and the salt spray resistance of the paint film was also reduced. In Comparative Example 3, all polyaspartate resin B was used, and the prepared coating was prepared into a paint film. The elongation at break was improved to a certain extent, but the tensile strength and impact resistance of the paint film were significantly reduced.

Finally, it should be noted that the above-mentioned embodiments only express several implementation modes of the present invention and are not intended to limit the creation of the present invention. For those of ordinary skill in the art, without departing from the concept of the present invention, Any modifications, equivalent substitutions, improvements, etc. shall be included in the protection scope of the invention. Therefore, the scope of protection of the patent of the present invention should be determined by the appended claims.

Claims (10)

1. The preparation method of the environment-friendly oily wind power blade coating is characterized by comprising the following steps of:

s1, adding polyaspartic acid ester resin A and siloxane oligomer into a reactor, heating to 100-120 ℃, reacting for 5-6 hours, cooling to room temperature, continuously adding polyaspartic acid ester resin B, pigment filler and auxiliary agent, and dispersing for 1-1.5 hours at high speed to obtain a component A;

s2, preparing an isocyanate curing agent, namely a component B;

s3, mixing the component A and the component B before use to prepare the environment-friendly oily wind power blade coating.

2. The method of claim 1, wherein the polyaspartic acid ester resin A in step S1 is prepared by reacting isophorone diamine with diethyl maleate.

3. The method of claim 1, wherein the polyaspartic acid ester resin B in step S1 is prepared by reacting polyetheramine D230 with diethyl maleate.

4. The method of claim 1, wherein the siloxane oligomer in step S1 is prepared by the following steps: and (3) carrying out polycondensation reaction on polysiloxane and deionized water at 70-80 ℃ for 5-8 hours, adding propylene glycol carbonate and a 5A molecular sieve, heating to 80-90 ℃ in a vacuum state, steaming out polycondensation by-product alcohols, and separating out the 5A molecular sieve to obtain the siloxane oligomer.

5. The process according to claim 4, wherein the siloxane oligomer in step S1 has a solids content of at least 75%.

6. The preparation method according to claim 1, wherein the pigment and filler in the step S1 is a mixture of titanium white powder, bentonite and talcum powder, and the weight ratio of the titanium white powder to the bentonite to the talcum powder is 1:1: (1-2).

7. The preparation method according to claim 1, wherein the auxiliary agent in the step S1 is a dispersant, a defoamer, a leveling agent and a thixotropic agent; wherein, the weight ratio of the dispersing agent, the defoaming agent, the leveling agent and the thixotropic agent is 1: (0.5-1): (0.5-1): (1-2);

the dispersant is at least one of BYK-110, BYK-9076, surfynol CT-136 and ECO-2111;

the defoamer is at least one of BYK-052N, EFKA 2722, refom 5400, refom 5500 and SF 808;

the leveling agent is at least one of BYK390, BYK354, BYK306, sago 3277 and JH-9565;

the thixotropic agent is at least one of R972, VK, KMT-40 and BYK-40.

8. The preparation method according to claim 1, wherein in the step S1, 40-60 parts by weight of the polyaspartic acid ester resin A, 10-15 parts by weight of the siloxane oligomer, 40-60 parts by weight of the polyaspartic acid ester resin B, 20-30 parts by weight of the pigment filler and 10-20 parts by weight of the auxiliary agent are included.

9. The preparation method according to claim 1, wherein the isocyanate curing agent in the step S2 is a mixture of an HDI trimer and an isocyanate curing agent, wherein the weight ratio of the HDI trimer to the isocyanate curing agent is (2-3): (6-8).

10. The preparation method according to claim 1, wherein the weight ratio of the component A to the component B in the step S3 is (1-5): 1.