CN113150667A - Ultrahigh-solid acrylic polyurethane finish paint and preparation method thereof - Google Patents

Abstract

The invention relates to an acrylic polyurethane finish paint with ultrahigh solid content and a preparation method thereof, belonging to the technical field of paint, wherein the finish paint comprises a component A and a component B in a weight ratio of 6-10:1, and the component A comprises the following components in parts by weight: 40-50 parts of high-solid acrylic resin, 8-15 parts of low-viscosity hydrocarbon resin, 3-6 parts of mixed organic solvent, 0.1-0.5 part of anti-settling agent, 0.1-0.3 part of defoaming agent, 30-40 parts of pigment, 0.3-0.8 part of dispersing agent, 0.3-0.8 part of flatting agent, 0.2-1 part of light stabilizer and 0.2-1 part of ultraviolet absorbent; the component B is solvent-free poly HDI trimer. The finish paint has ultrahigh solid content and good weather resistance and mechanical property.

Description

Ultrahigh-solid acrylic polyurethane finish paint and preparation method thereof

Technical Field

The invention belongs to the technical field of coatings, and particularly relates to an ultra-high solid acrylic polyurethane finish paint and a preparation method thereof.

Background

At present, in most of the fields of anticorrosive coating in China, such as petrochemical storage tanks, rail locomotives, wind power towers, bridge steel structures and the like, a coating system matched with solvent type epoxy primer, solvent type epoxy intermediate paint and solvent type acrylic polyurethane finish paint is mostly adopted, although the coatings can provide reliable anticorrosive protection for steel equipment, the coatings contain a large amount of solvents during construction, and damage to the environment and damage to human health are serious. With the acceleration of the industrialization process, the environmental pollution problem is increasingly prominent. The concept of "green paint" then comes to the front of the screen. The green coating comprises energy-saving and low-pollution water-based coating, powder coating, high-solid content coating, solvent-free coating, radiation curing coating and the like. This also puts higher demands on the green environmental protection aspect of the coating. GB/T35602 and 2017 Green product evaluation coating relate to a high-solid paint, and the VOC content requirement of the finish paint is less than or equal to 250 g/L. Therefore, the VOC content of the coating and the VOC release amount in the construction process are reduced, the environmental pollution is prevented and controlled, and the coating is beneficial to the health of human bodies.

CN201310635006.1 discloses a high-solid paint for containers, the viscosity of the paint is 4000-8000 mPas at a standard temperature of 23 ℃, the solvent volatilization amount of the paint under construction conditions is 35% -55%, and the paint is not a high-solid paint, so that the solvent volatilization amount is large during construction, VOC release in the construction process is large, the paint pollutes the environment, and the paint is harmful to human health.

CN201811083626.8 discloses a high-solid acrylic polyurethane finish paint and a preparation method thereof, wherein the construction solid content is 75.24-76.23%, the VOC content in the construction state is 278-298g/L, and the VOC content is reduced but the green product evaluation standard is still not met.

Disclosure of Invention

In order to reduce the VOC content of the acrylic polyurethane finish paint, the invention aims to provide the acrylic polyurethane finish paint with the ultrahigh solid content and the preparation method thereof. The acrylic polyurethane finish paint has ultrahigh solid content and good weather resistance and mechanical property.

In order to achieve the purpose, the invention adopts the specific scheme that:

a high-solid acrylic polyurethane finish paint comprises a component A and a component B;

the component A comprises the following components in parts by weight: 40-50 parts of high-solid acrylic resin, 8-15 parts of low-viscosity hydrocarbon resin, 3-6 parts of mixed organic solvent, 0.1-0.5 part of anti-settling agent, 0.1-0.3 part of defoaming agent, 30-40 parts of pigment, 0.3-0.8 part of dispersing agent, 0.3-0.8 part of flatting agent, 0.2-1 part of light stabilizer and 0.2-1 part of ultraviolet absorbent;

the component B is solvent-free poly HDI trimer;

the weight ratio of the component A to the component B is as follows: 6-10: 1.

Preferably, the high-solid acrylic resin is: more than or equal to 80 percent of solid content (weight) and the viscosity of the hydroxyl acrylic resin at 23 ℃ of 1000-1500 mpas, wherein the proportion of hydroxyl is 2.4-3.6 percent. Such as ESB-1280 resin, ESB-1283 resin, or 2380 resin, available from Shanghai.

Preferably, the low-viscosity hydrocarbon resin is German Luteiger LA300, and the solid content is more than or equal to 99 percent (weight).

The mixed organic solvent is formed by mixing butyl acetate and propylene glycol methyl ether acetate.

Preferably, the anti-settling agent is organic bentonite, such as BP-183 and BP-185 of Huate of Zhejiang.

Preferably, the dispersant is BYK-2155 or BYK2055 from Bekk, Germany, or EFKA-4010 or EFKA-5065 from BASF, Germany, or the like.

Preferably, the defoamer is a modified polysiloxane defoamer, such as: some of the Hamming modesty items Defom5300, Defom5400, Digao TEGO Airex 900, etc.

Preferably, the leveling agent is a fluorine modified acrylate polymer solution, such as: EFKA-3777 from BASF, Germany, or Merck MOK2024, MOK2041, Germany, etc.

Preferably, the pigment is one or two of rutile titanium dioxide and carbon black.

Preferably, the light stabilizer is basf Tinuvin 329.

Preferably, the ultraviolet absorber is basf UV 531.

Preferably, the solvent-free poly HDI trimer has an NCO content of 22 to 23%, a viscosity of 300 to 500mPas at 23 ℃ and a non-volatile matter of 100%, for example, the Asahi-formed TUL-100 or TLA-100.

The preparation method of the product of the invention, namely the acrylic polyurethane finish with ultrahigh solid content, comprises the following steps:

(1) pouring the high-solid acrylic resin and the low-viscosity hydrocarbon resin in parts by weight, together with a mixed organic solvent, an anti-settling agent, a pigment, a dispersing agent, a defoaming agent, a leveling agent, a light stabilizer and an ultraviolet absorbent, into a closed reaction kettle, uniformly dispersing at a high speed, controlling the linear velocity of a dispersion disc of the reaction kettle at 5-8m/s, and dispersing for 20-40 min;

(2) grinding the product obtained in the step (1) to be less than 20 mu m to obtain a component A;

(3) and (3) mixing the component A obtained in the step (2) with the component B curing agent in proportion, and uniformly dispersing to obtain the ultra-high solid acrylic polyurethane finish paint.

Has the advantages that:

(1) the paint film of the paint has excellent mechanical properties; (2) the solid mass fraction of the coating is more than 88 percent, 3 to 5 percent of diluent is properly added during construction, the solid mass fraction of the coating construction is more than or equal to 80 percent (coating-4 cups, the viscosity is 20 to 30s at 23 ℃), and the VOC is as low as below 250 g/L; (3) the coating disclosed by the invention is excellent in ageing resistance, and resistant to artificial accelerated ageing for 2000h, namely, gloss loss of grade 1 and powdering of grade 0.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention.

Example 1

The coating formulation of this example is shown in table 1 below.

Table 1: the coating formulation of example 1.

The preparation method of the ultra-high solid acrylic polyurethane finish paint of the embodiment is as follows:

the preparation method of the component A comprises the following steps: (1) pouring the high-solid acrylic resin, the hydrocarbon resin, the mixed organic solvent, the anti-settling agent, the pigment, the flatting agent, the dispersing agent, the defoaming agent, the light stabilizer and the ultraviolet absorbent into a closed reaction kettle together in parts by weight, uniformly dispersing at a high speed, wherein the linear velocity of a dispersion disc of the reaction kettle is 6m/s, and the dispersion time is 30 min; (2) grinding the paint obtained in the step (1) to be less than 20 mu m; (3) and (3) adding the leveling agent in parts by weight into the paint obtained in the step (2) and uniformly dispersing to obtain the component A.

And mixing the prepared coating A component and the prepared coating B component according to a formula ratio, and uniformly dispersing to obtain the ultra-high solid acrylic polyester urethane finish paint.

And (3) testing: the sample plate is prepared by the product of the embodiment according to the technical indexes, and the measured technical indexes are shown in table 5.

Examples 2 to 4

The amounts of the components of the ultra-high solid acrylic polyurethane finish paints of examples 2 to 4 are shown in tables 2, 3 and 4, the preparation methods are the same as those of example 1, and the performance indexes of the ultra-high solid acrylic polyurethane finish paints are shown in table 5.

Table 2: the coating formulation of example 2.

Table 3: the coating formulation of example 3.

Table 4: the coating formulation of example 4.

Table 5: the performance indexes of the ultra-high solid acrylic polyurethane finishes prepared in examples 1-4.

It should be noted that the above-mentioned embodiments illustrate rather than limit the scope of the invention, which is defined by the appended claims. It will be apparent to those skilled in the art that certain insubstantial modifications and adaptations of the present invention can be made without departing from the spirit and scope of the invention.

Claims (10)

1. A high-solid acrylic polyurethane finish paint comprises a component A and a component B; the method is characterized in that:

the component A comprises the following components in parts by weight: 40-50 parts of high-solid acrylic resin, 8-15 parts of low-viscosity hydrocarbon resin, 3-6 parts of mixed organic solvent, 0.1-0.5 part of anti-settling agent, 0.1-0.3 part of defoaming agent, 30-40 parts of pigment, 0.3-0.8 part of dispersing agent, 0.3-0.8 part of flatting agent, 0.2-1 part of light stabilizer and 0.2-1 part of ultraviolet absorbent;

the component B is solvent-free poly HDI trimer;

the weight ratio of the component A to the component B is as follows: 6-10: 1.

2. The high solids acrylic polyurethane topcoat of claim 1, wherein: the high-solid acrylic resin is as follows: the solid content is more than or equal to 80 percent, the viscosity at 23 ℃ is 1000-1500 mpas, and the proportion of hydroxyl is 2.4-3.6 percent.

3. The high solids acrylic polyurethane topcoat of claim 1, wherein: the low-viscosity hydrocarbon resin is German Luteige LA300, and the solid content is more than or equal to 99 percent.

4. The high solids acrylic polyurethane topcoat of claim 1, wherein: the mixed organic solvent is formed by mixing butyl acetate and propylene glycol methyl ether acetate.

5. The high solids acrylic polyurethane topcoat of claim 1, wherein: the anti-settling agent is organic bentonite; the defoaming agent is a modified polysiloxane defoaming agent; the leveling agent is fluorine modified acrylate polymer solution.

6. The high solids acrylic polyurethane topcoat of claim 1, wherein: the pigment is one or two of rutile titanium dioxide and carbon black.

7. The high solids acrylic polyurethane topcoat of claim 1, wherein: the light stabilizer is basf Tinuvin 329.

8. The high solids acrylic polyurethane topcoat of claim 1, wherein: the ultraviolet absorber is UV531 from Basff.

9. The high solids acrylic polyurethane topcoat of claim 1, wherein: the solvent-free poly HDI trimer has an NCO content of 22-23%, a viscosity of 300-500 mPas at 23 ℃ and a non-volatile matter of 100%, such as the Asahi-formed TUL-100 or TLA-100.

10. The method for preparing the ultra-high solid acrylic polyurethane finish paint according to any one of claims 1 to 9, wherein the method comprises the following steps: the method comprises the following steps:

(1) pouring high-solid acrylic resin, low-viscosity hydrocarbon resin, a mixed organic solvent, an anti-settling agent, a pigment, a dispersing agent, a defoaming agent, a leveling agent, a light stabilizer and an ultraviolet absorbent into a closed reaction kettle together according to parts by weight, uniformly dispersing at a high speed, controlling the linear velocity of a dispersion disc of the reaction kettle to be 5-8m/s, and dispersing for 20-40 min;

(2) grinding the product obtained in the step (1) to be less than 20 mu m to obtain a component A;

(3) and (3) mixing the component A obtained in the step (2) with the component B curing agent in proportion, and uniformly dispersing to obtain the ultra-high solid acrylic polyurethane finish paint.