A polyaspartic ester wood primer coating and a preparation method thereof

Abstract

The present application relates to the technical field of paint, in particular to a kind of polyaspartic ester wood primer coating and preparation method thereof.Polyaspartic ester wood primer coating includes the following weight parts of raw materials: including A component and B component, the A component includes the following weight parts of raw materials: aspartic resin 50-80 parts, dispersing agent 1-3 parts, titanium dioxide 6-16 parts, calcium carbonate 10-20 parts, molecular sieve 2-8 parts, defoaming agent 0.1-1.0 parts, leveling agent 0.1-1.0 parts, anti-sedimentation agent 0.1-1.0 parts, the B component includes curing agent;The weight ratio of A component and B component is 1 / 0.4-0.45.Formed coating surface is smooth and even, does not produce harmful substance and irritant smell, is friendly to environment, and also has the advantages such as fast curing, high adhesion, high corrosion resistance and high hardness;Compared with traditional coating, coating is reduced and construction is more simplified, greatly improves work efficiency.

Description

Technical Field

[0001] This invention relates to the field of coating technology, and in particular to a polyaspartic acid ester wood primer coating and its preparation method. Background Technology

[0002] Currently, the mainstream environmentally friendly coatings on the market are mainly high-solids coatings, UV-cured coatings, powder coatings, and water-based coatings.

[0003] Polyaspartic acid ester coatings are produced by the reaction of aliphatic polyisocyanates and aspartic acid esters. While currently used in the coatings industry, their application is limited by their high price and the significant investment in construction equipment. Furthermore, the costs of environmental treatment and labor continue to rise. A primer coating and process that can complete the filling requirements in one coat could significantly reduce costs and increase efficiency. Therefore, improving existing technologies to provide a polyaspartic acid ester wood primer coating that effectively improves construction efficiency, achieves good energy saving and emission reduction, and provides excellent coating performance is of great significance. Summary of the Invention

[0004] To address the shortcomings of the prior art, one objective of this invention is to provide a solvent-free polyaspartic acid ester wood primer coating. When used, this polyaspartic acid ester wood primer coating eliminates the need for initial application to the wood substrate, resulting in a smooth and even coating surface. Compared to traditional coatings, it exhibits superior overall performance, reduces coating thickness, simplifies application, significantly improves work efficiency, and demonstrates excellent energy-saving and emission-reduction effects.

[0005] Another objective of this invention is to provide a method for preparing polyaspartic acid ester wood primer coating. The method for preparing polyaspartic acid ester wood primer coating is simple in process, has high production efficiency, and produces polyaspartic acid ester wood primer coating product with stable quality and superior performance, which is conducive to large-scale production.

[0006] The objective of this invention is achieved through the following technical solution: a polyaspartic acid ester wood primer coating, comprising component A and component B. Component A comprises the following raw materials in parts by weight: 50-80 parts aspartic acid resin, 1-3 parts dispersant, 6-16 parts titanium dioxide, 10-20 parts calcium carbonate, 2-8 parts molecular sieve, 0.1-1.0 parts defoamer, 0.1-1.0 parts leveling agent, and 0.1-1.0 parts anti-settling agent. Component B comprises a curing agent. The weight ratio of component A to component B is 1 / 0.4-0.45. Components A and B are packaged separately when not in use.

[0007] Furthermore, each part of the aspartic resin, by weight, comprises 47-70 parts of the first aspartic resin and 3-10 parts of the second aspartic resin.

[0008] Furthermore, the first aspartic resin has an NH equivalent of 270-280 g / mol, a viscosity of 600-1200 mPa.s at 25°C, and a gel time (25°C / RH55%) of 25-35 min.

[0009] Furthermore, the second aspartic resin has an NH equivalent of 285-295 g / mol, a viscosity of 900-2000 mPa·s at 25°C, and a gel time (25°C / RH55%) of 120-140 min.

[0010] Furthermore, the curing agent is an HDI trimer curing agent.

[0011] The polyaspartic acid ester wood primer of this invention is formed by the reaction of aliphatic polyisocyanate and aspartic acid ester. Component A introduces more non-reactive functional groups into the diamine backbone structure (X) of the secondary amine molecular structure of the aspartic acid ester raw material to increase steric hindrance effect, while effectively synergistically improving drying performance and toughness with slow-drying resin. Component B is combined with HDI trimer, making its reactivity close to that of aliphatic polyurethane coatings, thus enabling its application in two-component spraying equipment in wood furniture factories. The polyaspartic acid ester wood primer is a two-component coating. When not in use, components A and B are packaged separately; when ready for use, they are mixed in a certain proportion to obtain a polyaspartic acid ester wood primer that can be coated on wood. When the polyaspartic acid ester wood primer is applied to the surface of wood, it eliminates the need for top coats or multiple coats. A single thick coat can be applied to the surface of wood to form a coating up to 1000μm thick. The resulting coating surface is smooth and flat, and it not only does not produce harmful substances or irritating odors, but also has the advantages of rapid curing, high adhesion, high corrosion resistance and high hardness. It is easy to apply and has high application efficiency.

[0012] Another objective of this invention is achieved through the following technical solution: the preparation method of the above-mentioned polyaspartic acid ester wood primer coating includes a preparation step of component A and a preparation step of component B:

[0013] A. The preparation method of component A includes the following steps:

[0014] Step A1: Add aspartic resin, dispersant and defoamer to a container and stir to obtain a resin mixture;

[0015] Step A2: Slowly add the molecular sieve, calcium carbonate, and titanium dioxide to the resin mixture prepared in step A1, and stir.

[0016] Step A3: Grind the mixture obtained in step A2 using a grinder until the fineness is less than or equal to 40 μm;

[0017] Step A4: Add leveling agent and anti-settling agent, stir and mix evenly to obtain component B, set aside for later use;

[0018] B. The preparation method of component B includes the following steps:

[0019] After filling the container with nitrogen, add HDI trimer curing agent, stir, and set aside.

[0020] Furthermore, in step A1, the stirring speed is 500-700 rpm and the stirring time is 5-15 min.

[0021] Furthermore, in step A2, the stirring speed is 750-950 rpm and the stirring time is 15-25 min.

[0022] Furthermore, in step A4, the stirring speed is 500-700 rpm and the stirring time is 5-15 min.

[0023] The preparation method of the polyaspartic acid ester wood primer of the present invention is simple, does not require complex equipment, has high production efficiency and low production cost, and produces a polyaspartic acid ester wood primer with stable quality, superior performance, and environmental friendliness, which is conducive to large-scale production.

[0024] The beneficial effects of this invention are as follows: The polyaspartic acid ester wood primer coating of this invention is a two-component coating. When not in use, components A and B are packaged separately; when ready for use, the two are mixed in a certain proportion to obtain a polyaspartic acid ester wood primer coating that can be applied to wood. When using this polyaspartic acid ester wood primer coating, it eliminates the need for initial coating on the wood substrate. Furthermore, this solvent-free polyaspartic acid ester wood primer coating has excellent energy-saving and emission-reduction effects. The resulting coating surface is smooth and flat, and it not only does not produce harmful substances or irritating odors, making it environmentally friendly, but also has advantages such as rapid curing, high adhesion, high corrosion resistance, and high hardness. Compared with traditional coatings, the coating layer is reduced and the construction is simpler, greatly improving construction efficiency. The preparation method of the polyaspartic acid ester wood primer coating is simple, has high production efficiency, and the resulting polyaspartic acid ester wood primer coating product has stable quality and superior performance, which is conducive to large-scale production. Attached Figure Description

[0025] Figure 1 The images show the product diagrams of components A and B of the polyaspartic acid ester wood primer coating of the present invention.

[0026] Figure 2The MDF materials are coated with the polyaspartic acid ester wood primer of the present invention and the MDF materials without primer coating. Detailed Implementation

[0027] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments. The content mentioned in the embodiments is not intended to limit the present invention.

[0028] In a typical embodiment of the present invention, a polyaspartic acid ester wood primer coating comprises component A and component B. Component A comprises the following raw materials in parts by weight: 50-80 parts aspartic acid resin, 1-3 parts dispersant, 6-16 parts titanium dioxide, 10-20 parts calcium carbonate, 2-8 parts molecular sieve, 0.1-1.0 parts defoamer, 0.1-1.0 parts leveling agent, and 0.1-1.0 parts anti-settling agent. Component B comprises a curing agent. Based on the equivalence principle (-NH / -NCO), the weight ratio of component A to component B is 1 / 0.4-0.45. Components A and B are packaged separately when not in use. The calcium carbonate is heavy calcium carbonate.

[0029] Furthermore, each part of the aspartic resin comprises, by weight, 47-70 parts of primary aspartic resin and 3-10 parts of secondary aspartic resin. The primary aspartic resin has an NH equivalent of 270-280 g / mol, a viscosity of 600-1200 mPa·s at 25°C, and a gel time (25°C / RH 55%) of 25-35 min.

[0030] Furthermore, the second aspartic resin has an NH equivalent of 285-295 g / mol, a viscosity of 900-2000 mPa·s at 25°C, and a gel time (25°C / RH55%) of 120-140 min.

[0031] Furthermore, the second aspartic resin has a non-volatile content of ≥99%, a clear and transparent appearance, an NH equivalent of 290 g / mol, a viscosity of 900-2000 mPa.s at 25°C, and a gel time (25°C / RH55%) of 130 min.

[0032] Furthermore, the curing agent is an HDI trimer curing agent. The curing agent is at least one of Wanhua Chemical HT-300 and Asahi Kasei TUL-100.

[0033] Furthermore, each part of the curing agent, by weight, includes 90 parts of Wanhua Chemical HT-30070 and 30 parts of Asahi Kasei TUL-10010.

[0034] In a typical embodiment of the present invention, a method for preparing a polyaspartic acid ester wood primer includes a preparation step of component A and a preparation step of component B:

[0035] A. The preparation method of component A includes the following steps:

[0036] Step A1: Add aspartic resin, dispersant and defoamer to a container and stir to obtain a resin mixture; the stirring speed is 500-700 rpm and the stirring time is 5-15 min.

[0037] Step A2: Slowly add molecular sieve, calcium carbonate and titanium dioxide to the resin mixture prepared in step A1, and stir; the stirring speed is 750-950 rpm and the stirring time is 15-25 min.

[0038] Step A3: Grind the mixture obtained in step A2 using a grinder until the fineness is less than or equal to 40 μm;

[0039] Step A4: Add leveling agent and anti-settling agent, stir at 500-700 rpm for 5-15 minutes to obtain component A; take a small sample of component A for testing, then package it for later use.

[0040] B. The preparation method of component B includes the following steps: after filling the container with nitrogen, add HDI trimer curing agent, stir at low speed for 4-10 minutes, then weigh and package as required.

[0041] Example 1

[0042] In this embodiment, a polyaspartic acid ester wood primer coating comprises component A and component B. Component A comprises the following raw materials in parts by weight: 58.2 parts aspartic acid resin, 2 parts dispersant, 15 parts titanium dioxide, 20 parts calcium carbonate, 4 parts molecular sieve, 0.4 parts defoamer, 0.2 parts leveling agent, and 0.2 parts anti-settling agent. Component B comprises a curing agent. When the equivalence ratio is 1.05, the weight ratio of component A to component B is 100 / 41.4. Components A and B are packaged separately when not in use.

[0043] Furthermore, each part of the aspartic resin, by weight, comprises 53.2 parts of primary aspartic resin and 5 parts of secondary aspartic resin. The primary aspartic resin has 100% non-volatile content, a clear and transparent appearance, an NH equivalent of 275 g / mol, a viscosity of 600-1200 mPa·s at 25°C, and a gel time (25°C / RH 55%) of 32 min. The secondary aspartic resin is Feiyang F520.

[0044] Furthermore, the calcium carbonate is heavy calcium carbonate, specifically Jiaoling Jinpeng JF-800. The titanium dioxide is Panzhihua Iron & Steel CR-350. The molecular sieve is Jianlong Chemical JLH-03-B molecular sieve.

[0045] Furthermore, the dispersant is Jiaming Chemical BZ2209 dispersant; the defoamer includes 0.2 parts of defoamer BYK-1790 and 0.2 parts of defoamer Nanben Chemical CX-880-50L. The leveling agent is leveling agent BYK-380N. The anti-settling agent is anti-settling agent BYK410.

[0046] Furthermore, the curing agent is an HDI trimer curing agent. Each part of the curing agent comprises 85 parts of Wanhua Chemical HT-300 and 15 parts of Asahi Kasei TUL-100.

[0047] In this embodiment, the preparation method of the above-mentioned polyaspartic acid ester wood primer coating includes a preparation step of component A and a preparation step of component B:

[0048] A. The preparation method of component A includes the following steps:

[0049] Step A1: Add aspartic resin, dispersant and defoamer to a container and stir to obtain a resin mixture; the stirring speed is 600 rpm and the stirring time is 10 min.

[0050] Step A2: Slowly add molecular sieve, calcium carbonate and titanium dioxide to the resin mixture prepared in step A1 and stir; the stirring speed is 800 rpm and the stirring time is 205 min.

[0051] Step A3: Grind the mixture obtained in step A2 using a grinder until the fineness is less than or equal to 40 μm;

[0052] Step A4: Add leveling agent and anti-settling agent, stir at 600 rpm for 10 minutes to obtain component A; take a small sample of component A for testing, then package it for later use.

[0053] B. The preparation method of component B includes the following steps: after filling the container with nitrogen, add HDI trimer curing agent, stir at low speed for 5 minutes, then weigh and package as required.

[0054] Example 2

[0055] In this embodiment, a polyaspartic acid ester wood primer coating comprises component A and component B. Component A comprises the following raw materials in parts by weight: 50 parts aspartic acid resin, 1 part dispersant, 6 parts titanium dioxide, 10 parts calcium carbonate, 2 parts molecular sieve, 0.1 part defoamer, 0.1 part leveling agent, and 0.1 part anti-settling agent. Component B comprises a curing agent. The weight ratio of component A to component B is 100 / 40. Components A and B are packaged separately when not in use.

[0056] Furthermore, each part of the aspartic resin comprises, by weight, 47 parts of primary aspartic resin and 3 parts of secondary aspartic resin. The curing agent is an HDI trimer curing agent. Each part of the curing agent comprises 70 parts of Wanhua Chemical HT-300 and 30 parts of Asahi Kasei TUL-100.

[0057] In this embodiment, a method for preparing a polyaspartic acid ester wood primer includes a preparation step for component A and a preparation step for component B:

[0058] A. The preparation method of component A includes the following steps:

[0059] Step A1: Add aspartic resin, dispersant and defoamer to a container and stir to obtain a resin mixture; the stirring speed is 500 rpm and the stirring time is 15 min.

[0060] Step A2: Slowly add molecular sieve, calcium carbonate and titanium dioxide to the resin mixture prepared in step A1, and stir; the stirring speed is 750 rpm and the stirring time is 25 min.

[0061] Step A3: Grind the mixture obtained in step A2 using a grinder until the fineness is less than or equal to 40 μm;

[0062] Step A4: Add leveling agent and anti-settling agent, stir at 500 rpm for 15 min to obtain component A; take a small sample of component A for testing, then package it for later use.

[0063] B. The preparation method of component B includes the following steps: after filling the container with nitrogen, add HDI trimer curing agent, stir at low speed for 5 minutes, then weigh and package as required.

[0064] Example 3

[0065] In this embodiment, in a typical implementation of the present invention, a polyaspartic acid ester wood primer coating comprises component A and component B. Component A comprises the following raw materials in parts by weight: 80 parts aspartic acid resin, 3 parts dispersant, 16 parts titanium dioxide, 20 parts calcium carbonate, 8 parts molecular sieve, 1.0 part defoamer, 1.0 part leveling agent, and 1.0 part anti-settling agent. The weight ratio of component A to component B is 100 / 45. Components A and B are packaged separately when not in use.

[0066] Furthermore, each part of the aspartic resin comprises, by weight, 70 parts of primary aspartic resin and 10 parts of secondary aspartic resin. The curing agent is an HDI trimer curing agent. Each part of the curing agent comprises 80 parts of Wanhua Chemical HT-300 and 20 parts of Asahi Kasei TUL-100.

[0067] In this embodiment, a method for preparing a polyaspartic acid ester wood primer includes a preparation step for component A and a preparation step for component B:

[0068] A. The preparation method of component A includes the following steps:

[0069] Step A1: Add aspartic resin, dispersant and defoamer to a container and stir to obtain a resin mixture; the stirring speed is 700 rpm and the stirring time is 5 min.

[0070] Step A2: Slowly add molecular sieve, calcium carbonate and titanium dioxide to the resin mixture prepared in step A1, and stir; the stirring speed is 950 rpm and the stirring time is 15 min.

[0071] Step A3: Grind the mixture obtained in step A2 using a grinder until the fineness is less than or equal to 40 μm;

[0072] Step A4: Add leveling agent and anti-settling agent, stir at 700 rpm for 5 minutes to obtain component A; take a small sample of component A for testing, then package it for later use.

[0073] The preparation method of component B includes the following steps: after filling the container with nitrogen, add HDI trimer curing agent, stir at low speed for 10 minutes, then weigh and package as required.

[0074] The rest of the content of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

[0075] Example 4

[0076] In this embodiment, in a typical implementation of the present invention, a polyaspartic acid ester wood primer coating comprises component A and component B. Component A comprises the following raw materials in parts by weight: 60 parts aspartic acid resin, 2 parts dispersant, 10 parts titanium dioxide, 15 parts calcium carbonate, 4 parts molecular sieve, 4 parts defoamer, 3 parts leveling agent, and 3 parts anti-settling agent. Component B comprises a curing agent. The weight ratio of component A to component B is 100 / 43. Components A and B are packaged separately when not in use.

[0077] The rest of the content of this embodiment is the same as that of Embodiment 1, and will not be repeated here.

[0078] Comparative Example 1

[0079] The difference between this comparative example and Example 1 is that an equal amount of aspartic resin (Feiyang Chemical F420) was used to replace the first aspartic resin in Example 1. The rest of this comparative example is the same as Example 1.

[0080] Comparative Example 2

[0081] The difference between this comparative example and Example 1 is that an equal amount of Covestro NH 1420 aspartic resin was used instead of the first aspartic resin in Example 1. An equal amount of Covestro NH 1520 aspartic resin was used instead of the second aspartic resin in Example 1. The rest of this comparative example is the same as Example 1.

[0082] Comparative Example 3

[0083] The difference between this comparative example and Example 1 is that an equal amount of Covestro NH 1420 aspartic resin was used to replace the first and second aspartic resins in Example 1. The rest of this comparative example is the same as Example 1.

[0084] Comparative Example 4

[0085] The difference between this comparative example and Example 1 is that an equal amount of Covestro NH 1520 aspartic resin is used instead of the first and second aspartic resins in Example 1. The rest of this comparative example is the same as Example 1.

[0086] The polyaspartic acid ester wood primers prepared in Example 1 and Comparative Examples 1-4 were applied to MDF (medium-density fiberboard) materials in one thick coat, and their performance was tested. The performance parameters are shown in Table 1 below.

[0087]

[0088]

[0089] By comparing Example 1 and Comparative Example 1, the inventors found that Comparative Example 1, which used an equal amount of aspartic resin Feiyang Chemical F420 to replace the first aspartic resin in Example 1, not only had a coating with inferior adhesion to the material compared to Example 1, but also had significantly lower solvent resistance.

[0090] By comparing Example 1 and Comparative Example 2, the inventors found that Comparative Example 2, which used an equal amount of Covestro NH 1420 aspartic resin to replace the first aspartic resin in Example 1 and an equal amount of Covestro NH 1520 aspartic resin to replace the second aspartic resin in Example 1, not only did the coating obtained have poor adhesion to the material and fail to meet the standards, but the solvent resistance of the coating was also significantly worse than that of Example 1.

[0091] By comparing Example 1 and Comparative Example 3, the inventors found that Comparative Example 3 used an equal amount of Covestro NH 1420 aspartic resin to replace the first and second aspartic resins in Example 1. Although it had higher hardness, the gel time was shorter. Not only was the adhesion between the coating and the material poor and substandard, but the solvent resistance of the coating was also significantly worse than that of Example 1.

[0092] By comparing Example 1 and Comparative Example 4, it can be found that when an equal amount of Covestro NH1520 aspartic resin is used to replace the first and second aspartic resins in Example 1, the drying time of the coating is much longer than that of Example 1, the hardness of the coating is lower, and the solvent resistance of the coating is also significantly worse than that of Example 1.

[0093] This invention creatively employs a compound of first-component and second-component aspartic resins, combined with other raw materials, to prepare a two-component polyaspartic ester wood primer coating composition. When the polyaspartic ester wood primer coating prepared by the reaction of component A and component B is used, the resulting coating surface is smooth and flat. It not only does not produce harmful substances or irritating odors, making it environmentally friendly, but also has advantages such as rapid curing, high adhesion, high corrosion resistance, and high hardness. Furthermore, it requires less coating and simplifies construction, greatly improving construction efficiency.

[0094] The specific embodiments described above are further illustrations of the technical solution and beneficial effects of the present invention, and are not intended to limit the implementation methods. For those skilled in the art, any obvious substitutions without departing from the concept of the present invention are within the protection scope of the present invention.

Claims

1. A solvent-free polyaspartic acid ester wood primer coating, characterized in that: The product comprises component A and component B. Component A includes the following raw materials in parts by weight: 50-80 parts aspartic resin, 1-3 parts dispersant, 6-16 parts titanium dioxide, 10-20 parts calcium carbonate, 2-8 parts molecular sieve, 0.1-1.0 parts defoamer, 0.1-1.0 parts leveling agent, and 0.1-1.0 parts anti-settling agent. Component B includes a curing agent. The weight ratio of component A to component B is 1 / 0.4-0.

45. Each part of the aspartic resin, by weight, includes 47-70 parts of primary aspartic resin and 3-10 parts of secondary aspartic resin. The primary aspartic resin has an NH equivalent of 270-280 g / mol, a viscosity of 600-1200 mPa·s at 25°C, and a gel time of 55% at 25°C and RH. The gel time is 25-35 min at RH55%; the NH equivalent of the second aspartic resin is 285-295 g / mol, the viscosity at 25℃ is 900-2000 mPa.s, and the gel time at 25℃ and RH55% is 120-140 min; the curing agent is an HDI trimer curing agent.

2. A method for preparing a solvent-free polyaspartic acid ester wood primer coating as described in claim 1, characterized in that: Includes the following steps: A. The preparation method of component A includes the following steps: Step A1: Add aspartic resin, dispersant and defoamer to a container and stir to obtain a resin mixture; Step A2: Add molecular sieve, calcium carbonate and titanium dioxide to the resin mixture obtained in step A1 and stir. Step A3: Grind the mixture obtained in step A2 using a grinder; Step A4: Add leveling agent and anti-settling agent, stir and mix evenly to obtain component B, set aside for later use; B. The preparation method of component B includes the following steps: after filling the container with nitrogen, add HDI trimer curing agent, stir, and set aside for use.

3. The method for preparing solvent-free polyaspartic acid ester wood primer coating according to claim 2, characterized in that: In step A1, the stirring speed is 500-700 rpm and the stirring time is 5-15 min.

4. The method for preparing solvent-free polyaspartic acid ester wood primer coating according to claim 2, characterized in that: In step A2, the stirring speed is 750-950 rpm and the stirring time is 15-25 min.

5. The method for preparing solvent-free polyaspartic acid ester wood primer coating according to claim 2, characterized in that: In step A3, the mixture obtained in step A2 is ground using a grinder until the fineness is less than or equal to 40 μm.

6. The method for preparing solvent-free polyaspartic acid ester wood primer coating according to claim 2, characterized in that: In step A4, the stirring speed is 500-700 rpm and the stirring time is 5-15 min.

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