Preparation and application of an aspartame polyurea coating active diluent

Abstract

The present application relates to the field of chemical coatings, specifically to a method for synthesizing a reactive diluent and preparing a VOC-free aspartate polyurea coating. The method comprises the following steps: high-speed mixing and grinding of polyaspartic acid ester, a desiccant, a pigment, a reactive diluent, and an additive in a mass ratio of polyaspartic acid ester: desiccant: pigment: reactive diluent: additive of (80-100):(2-3):(0-80):(10-30):(1-10) to obtain a polyaspartic acid ester composition; and mixing and curing the polyaspartic acid ester composition with a curing agent in a mass ratio of polyaspartic acid ester composition: curing agent of 100:(50-70) to obtain an aspartate polyurea coating. The aspartate polyurea coating prepared in the present application has the advantages of low viscosity and zero VOC emissions.

Description

Technical Field

[0001] The present application relates to the field of chemical coatings, and in particular to a method for synthesizing a reactive diluent and preparing a VOC-free aspartame polyurea coating. Background Art

[0002] Polyaspartic acid polyurea coatings, made from a mixture of aspartic acid ester and an isocyanate curing agent, offer high weather resistance, high performance, and environmental friendliness. They boast high gloss and excellent adhesion to substrate surfaces. Furthermore, they offer a suitable pot life, a fast drying time, and excellent resistance to acids, alkalis, and salt spray. Consequently, polyaspartic acid polyurea coatings are highly regarded for their excellent performance and convenient application.

[0003] Compared with conventional resins such as polyester, acrylic resin, and epoxy resin, polyaspartic acid resin has a relatively low viscosity when the coating contains the same mass fraction of solids. No solvent can be added to the formulation. However, the viscosity of the finished coating is still relatively high, making it difficult to apply directly, especially the low viscosity required for spray application. Therefore, a small amount of organic solvent is often needed as a thinner, which leads to organic solvent emissions. Summary of the Invention

[0004] Those skilled in the art should understand that, although there are many problems in the prior art, each embodiment or technical solution of the present invention can be improved in only one or several aspects, and it is not necessary to solve all the technical problems listed in the prior art or background art at the same time. To solve at least one of the problems, the present application first provides a reactive diluent, wherein the amine in the raw material of the reactive diluent is selected from at least one of ethylamine, isobutylamine, tert-butylamine, octylamine, hexylamine, and cyclohexylamine; the double-bonded compound in the raw material for preparing the reactive diluent is selected from at least one of isooctyl acrylate, ethoxyethoxyethyl acrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, dimethylacrylamide, and caprolactone acrylate; and the molar ratio of the amine to the double-bonded compound is 1:(1 to 1.02).

[0005] The preparation method of the above-mentioned active diluent is to mix the amines and the double-bond compound uniformly, raise the temperature to 50°C to 120°C under nitrogen protection, react until complete, and then remove the unreacted amine to obtain the active diluent. The reaction takes 3-6 days to complete.

[0006] Those skilled in the art can freely choose within the above amines, double bond compounds and their molar ratios, for example:

[0007] In a specific example of preparing a reactive diluent, the molar ratio of ethylamine to isooctyl acrylate is 1:1, the reaction temperature is 50°C, and the reaction time is 6 days;

[0008] In a specific example of preparing a reactive diluent, the molar ratio of ethylamine to isooctyl acrylate is 1:1.02, the reaction temperature is 70°C, and the reaction time is 5 days;

[0009] In a specific example of preparing a reactive diluent, the molar ratio of ethylamine to isooctyl acrylate is 1:1, the reaction temperature is 100° C., and the reaction time is 4 days;

[0010] In a specific example of preparing a reactive diluent, the molar ratio of ethylamine to isooctyl acrylate is 1:1, the reaction temperature is 120°C, and the reaction time is 3 days;

[0011] In a specific example of preparing a reactive diluent, the molar ratio of ethylamine to hydroxyethyl acrylate is 1:1.02, the reaction temperature is 120°C, and the reaction time is 3 days;

[0012] In a specific example of preparing a reactive diluent, the molar ratio of ethylamine to ethoxyethoxyethyl acrylate is 1:1, the reaction temperature is 120° C., and the reaction time is 3 days;

[0013] In a specific example of preparing a reactive diluent, the molar ratio of ethylamine to dimethylacrylamide is 1:1.02, the reaction temperature is 90°C, and the reaction time is 5 days;

[0014] In a specific example of preparing a reactive diluent, the molar ratio of ethylamine to caprolactone acrylate is 1:1.02, the reaction temperature is 90°C, and the reaction time is 5 days;

[0015] In a specific example of preparing a reactive diluent, the molar ratio of isobutylamine to isooctyl acrylate is 1:1, the reaction temperature is 60°C, and the reaction time is 6 days;

[0016] In a specific example of preparing a reactive diluent, the molar ratio of isobutylamine to isooctyl acrylate is 1:1.02, the reaction temperature is 80° C., and the reaction time is 5 days;

[0017] In a specific example of preparing a reactive diluent, the molar ratio of isobutylamine to isooctyl acrylate is 1:1.02, the reaction temperature is 80°C, and the reaction time is 4 days;

[0018] In a specific example of preparing a reactive diluent, the molar ratio of isobutylamine to dimethylacrylamide is 1:1, the reaction temperature is 100°C, and the reaction time is 3 days;

[0019] In a specific example of preparing a reactive diluent, the molar ratio of isobutylamine to caprolactone acrylate is 1:1, the reaction temperature is 120°C, and the reaction time is 3 days;

[0020] In a specific example of preparing a reactive diluent, the molar ratio of tert-butylamine to ethoxyethoxyethyl acrylate is 1:1, the reaction temperature is 120° C., and the reaction time is 3 days;

[0021] In a specific example of preparing a reactive diluent, the molar ratio of tert-butylamine to hydroxyethyl acrylate is 1:1.02, the reaction temperature is 120° C., and the reaction time is 3 days;

[0022] In a specific example of preparing a reactive diluent, the molar ratio of tert-butylamine to hydroxyethyl acrylate is 1:1, the reaction temperature is 120° C., and the reaction time is 3 days;

[0023] In a specific example of preparing a reactive diluent, the molar ratio of tert-butylamine to dimethylacrylamide is 1:1, the reaction temperature is 120°C, and the reaction time is 3 days;

[0024] In a specific example of preparing a reactive diluent, the molar ratio of tert-butylamine to caprolactone acrylate is 1:1.02, the reaction temperature is 120° C., and the reaction time is 3 days;

[0025] In some specific examples of the preparation of reactive diluents, for example, octylamine is reacted with isooctyl acrylate, ethoxyethoxyethyl acrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, dimethylacrylamide, and caprolactone acrylate, respectively, at a molar ratio of 1:1.02, a reaction temperature of 120° C., and a reaction time of 3 days;

[0026] In a specific example of preparing a reactive diluent, the molar ratio of cyclohexylamine to hydroxyethyl acrylate is 1:1, the reaction temperature is 90° C., and the reaction time is 5 days;

[0027] In a specific example of preparing a reactive diluent, the molar ratio of cyclohexylamine to ethoxyethoxyethyl acrylate is 1:1, the reaction temperature is 90° C., and the reaction time is 5 days;

[0028] In a specific example of preparing a reactive diluent, the molar ratio of cyclohexylamine to hydroxyethyl methacrylate is 1:1, the reaction temperature is 90° C., and the reaction time is 5 days;

[0029] In a specific example of preparing a reactive diluent, the molar ratio of cyclohexylamine dimethyl acrylamide to is 1:1, the reaction temperature is 90°C, and the reaction time is 5 days;

[0030] In a specific example of preparing a reactive diluent, the molar ratio of cyclohexylamine to caprolactone acrylate is 1:1, the reaction temperature is 90°C, and the reaction time is 5 days;

[0031] The viscosity of the active diluents obtained from the above raw materials and preparation methods does not exceed 100 cP at 25°C (tested in accordance with ASTM D2196-1999 standard), and they all have relatively low viscosities that are conducive to construction. The significant difference between these active diluents is the reaction rate, which slows down as the length of the fatty chain or the branching of the amine compound increases.

[0032] The present application also provides a 0-VOC aspartic acid polyurea coating and a preparation method thereof, wherein the 0-VOC aspartic acid polyurea coating comprises polyaspartic acid ester, a desiccant, a pigment filler, a reactive diluent, and an additive, and the mass ratio of polyaspartic acid ester: desiccant: pigment filler: reactive diluent: additive is (80-100):(2-4):(0-80):(10-30):(1-10);

[0033] The polyaspartic acid ester resin is a solvent-free tough polyaspartic acid ester resin with a viscosity of about 800 cP;

[0034] The desiccant is a commonly used molecular sieve, and the molecular sieve is at least one of 3A, 4A, and 5A types, but not limited thereto;

[0035] The filler is at least one of barium sulfate, talc, and feldspar powder, but is not limited thereto;

[0036] The pigment is titanium dioxide, and other pigments may also be used, but are not limited thereto;

[0037] The ratio of the pigment to the filler can be selected by those skilled in the art within the conventional dosage range;

[0038] The active diluent is the active diluent prepared in this application;

[0039] The additives include wetting and dispersing agents, defoaming agents and leveling agents, which are conventional technical choices in the field. That is, it is well known to those skilled in the art that the amount of wetting agent added is generally 5-10% of the total amount of pigments and fillers, the amount of defoaming agent is 0.5-2% of the total amount of the formula, and the amount of leveling agent is 0.5-2% of the total amount of the formula;

[0040] The wetting and dispersing agents are TEGO Dispers 628 and BYK110;

[0041] The defoamer is a composite defoamer mixed with silicone and other polymers;

[0042] The leveling agent is an acrylate leveling agent or a silicone leveling agent with a defoaming function;

[0043] The 0-VOC aspartic acid polyurea coating is prepared by the following method: polyaspartic acid ester, a desiccant, a pigment, a reactive diluent, and an additive are mixed in a mass ratio of polyaspartic acid ester: desiccant: pigment: reactive diluent: additive of (80-100): (2-3): (0-80): (10-30): (1-10), uniformly dispersed at a speed of 1000-1500 r / min, and ground in a sand mill to a qualified fineness to obtain a polyaspartic acid ester composition; and the prepared polyaspartic acid ester composition is mixed with a curing agent in a mass ratio of 100: (50-70) to obtain the 0-VOC aspartic acid polyurea coating.

[0044] The polyaspartic acid ester is a solvent-free tough polyaspartic acid ester resin with a viscosity of about 800±50 cP; the desiccant is a commonly used molecular sieve, for example, at least one selected from 3A, 4A, and 5A molecular sieves, and the added amount does not exceed 3% of the total formula;

[0045] The color filler includes fillers and pigments, and the pigments and fillers are commonly used in the field. The pigments and fillers are conventionally used in the field and can be mixed into a coating viscosity that is easy to handle according to actual needs; therefore, the pigment can be selected from titanium dioxide or other pigments; if transparent and colorless is required, no pigment can be added; the filler can be selected from barium sulfate, talc, feldspar powder, etc.

[0046] In some embodiments, the desiccant is molecular sieve 3A, and the addition amount is 2% of the formula; the pigment is titanium dioxide, and the amount is 20% of the polyaspartic acid resin; the filler is talc, and the amount is 5% of the polyaspartic acid resin; the wetting and dispersing agent among the additives is TEGO Dispers 628, and the amount is 5% of the pigment and filler; the defoaming agent is polydimethylsiloxane, and the amount is 0.5% of the formula amount; the leveling agent is an acrylate leveling agent, and the amount is 2% of the formula amount; the active diluent is ethylamine and isooctyl acrylate, ethoxyethoxyethyl acrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, dimethylacrylamide, and caprolactone acrylate in a molar ratio of 1:1, and the mass ratio of the active diluent to polyaspartic acid is 3:8.

[0047] In some embodiments, the desiccant is selected from molecular sieve 4A, and the addition amount is 3% of the polyaspartic acid ester; the pigment is titanium dioxide, and the addition amount is 22% of the polyaspartic acid ester resin; the filler is talc, and the addition amount is 5% of the polyaspartic acid ester resin; the wetting and dispersing agent among the additives is selected from TEGO Dispers 628, and the addition amount is 5% of the pigment and filler; the defoaming agent is selected from polydimethylsiloxane, and the addition amount is 0.5% of the formula amount; the leveling agent is selected from acrylate leveling agent, and the addition amount is 1% of the formula amount; the active diluent is selected from isobutylamine or tert-butylamine and isooctyl acrylate, ethoxyethoxyethyl acrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, dimethylacrylamide, and caprolactone acrylate in a molar ratio of 1:1.02, and the mass ratio of the active diluent to polyaspartic acid ester is 1:10.

[0048] In some embodiments, the desiccant is selected from molecular sieve 3A, and the addition amount is 2% of the polyaspartic acid ester; the pigment is titanium dioxide, and the addition amount is 22% of the polyaspartic acid ester resin; the filler is feldspar powder, and the addition amount is 5% of the polyaspartic acid ester resin; the wetting and dispersing agent among the additives is selected from TEGO Dispers 628, and the addition amount is 5% of the pigment and filler; the defoaming agent is selected from polydimethylsiloxane, and the addition amount is 0.5% of the formula amount; the leveling agent is selected from acrylate leveling agent, and the addition amount is 1% of the formula amount; the active diluent is selected from hexylamine or octylamine, and the molar ratio of hexylamine to isooctyl acrylate, ethoxyethoxyethyl acrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, dimethylacrylamide, and caprolactone acrylate is 1:1, and the mass ratio of the amount to polyaspartic acid ester is 2:9.

[0049] In some embodiments, the desiccant is selected from molecular sieve 3A, and the addition amount is 2% of the polyaspartic acid ester; the pigment is titanium dioxide, and the addition amount is 22% of the polyaspartic acid ester resin; the filler is barium sulfate, and the addition amount is 8% of the polyaspartic acid ester resin; the wetting and dispersing agent among the additives is selected from TEGO Dispers 628, and the addition amount is 5% of the pigment and filler; the defoaming agent is selected from polydimethylsiloxane, and the addition amount is 0.5% of the formula amount; the leveling agent is selected from acrylate leveling agent, and the addition amount is 1% of the formula amount; the active diluent is selected from an active diluent with a molar ratio of hexylamine to hydroxyethyl acrylate of 1:1, and the mass ratio of the amount to the polyaspartic acid ester is 3:10.

[0050] In some embodiments, the desiccant is selected from molecular sieve 3A, and the addition amount is 2% of the polyaspartic acid ester; the pigment is titanium dioxide, and the addition amount is 22% of the polyaspartic acid ester resin; the filler is barium sulfate, and the addition amount is 8% of the polyaspartic acid ester resin; the wetting and dispersing agent among the additives is selected from TEGO Dispers 628, and the addition amount is 5% of the pigment and filler; the defoaming agent is selected from polydimethylsiloxane, and the addition amount is 0.5% of the formula amount; the leveling agent is selected from acrylate leveling agent, and the addition amount is 1% of the formula amount; the active diluent is selected from cyclohexylamine, and the molar ratio of cyclohexylamine to isooctyl acrylate, ethoxyethoxyethyl acrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, dimethylacrylamide, and caprolactone acrylate is 1:1, and the mass ratio of the amount to polyaspartic acid ester is 3:8.

[0051] The inventors found that in the above embodiments, the type of reactive diluent, that is, the raw materials of the reactive dilution and the amines and double bond compounds mainly affect the synthesis reaction rate, and the effect of the type of reactive diluent on the final coating is not a major factor relative to the amount of reactive diluent used; when the amount of reactive diluent is within the above ratio range, the viscosity of the aspartame polyurea coating decreases with the increase of the amount of reactive diluent, indicating that the reactive diluent can significantly reduce the viscosity of the coating and increase the operability; the adhesion and tensile strength of the coating sample first increase and then decrease with the increase of the amount of reactive diluent within the above range; the hardness will also decrease accordingly, and the elongation at break increases with the increase of the amount of reactive diluent within the above range. DETAILED DESCRIPTION

[0052] The viscosity test of all embodiments of this application complies with the standard ASTM D 2196-1999, and the unit is cP;

[0053] The gloss (60°) test of all embodiments of this application complies with GB 1743-1979 (1989);

[0054] The adhesion test of all embodiments of this application complies with GB / T 5210, and the unit is MPa;

[0055] The leveling and appearance of all examples in this application were tested visually, with 5 being the best.

[0056] The pencil hardness test in all examples of this application complies with GB / T 6739-1996;

[0057] The tensile strength test of all embodiments of this application complies with GB / T 1040, unit: MPa;

[0058] The elongation at break (%) of all embodiments of this application is tested in accordance with GB / T 1040;

[0059] The bendability test of all embodiments of this application complies with GB / T 6472, and the unit is mm.

[0060] Unless otherwise specified, the raw materials used can be conventional commercial products in the field, or prepared by conventional methods in the field. The only polyaspartic acid ester resin is Feiyang Company's F420 (viscosity 800 cP); the wetting and dispersing agent is TEGO Disperser 628; the defoaming agent is BYK-052; the leveling agent is BYK-333; the molecular sieves are 3A, 4A and 5A; the polyisocyanate curing agent is Wanhua HT-300, with a viscosity (25°C): 560 mPa·s and an NCO content of 20%. The experimental results are used as an example to illustrate the implementation process of the invention.

[0061] Preparation Example of Reactive Diluent

[0062] The amine raw materials used to prepare the reactive diluent can be selected from ethylamine, isobutylamine, tert-butylamine, octylamine, hexylamine, and cyclohexylamine; the double-bonded compound used to prepare the reactive diluent can be selected from isooctyl acrylate, ethoxyethoxyethyl acrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, dimethylacrylamide, and caprolactone acrylate;

[0063] The selected amine and the double bond compound are mixed in a mass ratio of 1:(1-1.02), and the mixture is heated to 50°C-120°C under nitrogen protection to allow the reaction to complete. The unreacted amine is then removed to obtain the active diluent. The reaction takes 3-6 days to complete.

[0064] Specific Preparation Example: Taking the amine as cyclohexylamine and the double-bond compound as dimethylacrylamide as an example, 99 g of cyclohexylamine and dimethylacrylamide (both molecular weight 99) were weighed and mixed uniformly. Under nitrogen, the mixture was heated to 90°C and allowed to react for 6 days. The residual cyclohexylamine was then removed by vacuum distillation to obtain a reactive diluent. The product was a colorless, transparent liquid with a viscosity of 10 cp at 25°C, or 11 seconds (approx. 4 cups).

[0065] Based on the above content, those skilled in the art can select amines, compounds with double bonds, reaction temperature and duration to obtain the active diluent described in this application without creative work.

[0066] The raw materials for the active dilution include amines and compounds with double bonds. When the amines are selected from at least one of ethylamine, isobutylamine, tert-butylamine, octylamine, hexylamine, and cyclohexylamine, and the compound with double bonds is selected from at least one of isooctyl acrylate, ethoxyethoxyethyl acrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, dimethylacrylamide, and caprolactone acrylate, and the molar ratio of the amine compounds to the compound with double bonds is within the range of 1:(1-1.02), the significant differences between the two are reaction speed and final viscosity. The viscosity of the active dilution material prepared by the above raw material selection, proportioning, and preparation method does not exceed 100 cP. When the active dilution material is used in a polyurea coating, the mass ratio of the active dilution material to the polyaspartic acid ester is within the range of (1-3):(8-10), and the obtained aspartic acid polyurea coating has excellent workable viscosity.

[0067] Example 1

[0068] Component A (parts by weight): Weigh 100kg of polyaspartic acid ester resin, 0.5kg of wetting and dispersing agent, 0.2kg of defoaming agent, 0.5kg of leveling agent, 5kg of reactive diluent, 3kg of desiccant, and 30kg of pigment and filler; evenly disperse all the above components at a speed of 1000-1500 r / min, and grind in a sand mill to an acceptable fineness. Filter to obtain Component A;

[0069] The active diluents used were cyclohexylamine and isooctyl acrylate in a molar ratio of 1:1;

[0070] The desiccant is molecular sieve 3A;

[0071] The pigment is titanium dioxide 22kg, and the filler is barium sulfate 8kg

[0072] The asparagus polyurea coating is obtained by mixing component A and component B. The ratio of component A to component B is shown in Table 1.

[0073] Examples 2-4

[0074] The ratio of component A and component B in Example 2-4 is shown in Table 1, and the preparation method is the same as that in Example 1.

[0075] Comparative Example 1

[0076] The difference between Comparative Example 1 and Example 1 is that no active diluent is added. The proportions of other components are shown in Table 1. The preparation method is the same as that of Example 1.

[0077] Table 1: Allocation ratios of each group in Examples 1-4 and Comparative Example 1

[0078]

[0079]

[0080] The asparagus paint was used to prepare a sample, with the thickness controlled at 100±10 μm, and left for 7 days before performance testing. The test results are shown in Table 2.

[0081] project Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Viscosity of component A, c P 1540 882 461 329 2150 Viscosity after mixing A and B, cP 1130 710 520 415 1620 Gloss, 60° 90 93 92 91 89 Adhesion, MPa 14 20 23 18 12 Leveling and appearance 3 4 5 5 1 Pencil hardness 3H 3H 2H 2H 3H Tensile strength, MPa 12.2 13.1 14.4 10.5 12.7 Elongation at break, % 65 70 85 110 60 Flexibility, mm 1 1 1 1 2

[0082] The reactive diluents in Examples 1-4 are identical, except for the different amounts used. As can be seen from the results in Table 2, the viscosity of the aspartate polyurea coating decreases with increasing amounts of reactive diluent. In Example 1, the ratio of reactive diluent to polyaspartic acid resin is 5:100, and the viscosity is as high as 1540 cP. The viscosity of Comparative Example 1 without reactive diluent is 2150 cP, indicating that the reactive diluent can significantly reduce the viscosity of the coating and increase operability.

[0083] The adhesion of the coating sample increased from 14 MPa to 23 MPa and then decreased to 18 MPa;

[0084] The tensile strength increased from 12.2 MPa to 14.4 MPa and then decreased to 10.5 MPa, indicating that the adhesion and tensile strength first increased and then decreased with the increase of the amount of reactive diluent;

[0085] The elongation at break increases with increasing amount of reactive diluent within the above range.

[0086] Example 5

[0087] Component A (parts by weight): Weigh 80kg of polyaspartic acid ester resin, 0.3kg of wetting and dispersing agent, 0.2kg of defoaming agent, 0.5kg of leveling agent, 30kg of reactive diluent, 2kg of desiccant, and 30kg of pigment and filler. Disperse all components uniformly at a speed of 1000-1500 r / min, then grind in a sand mill to an acceptable fineness. Filter to obtain Component A.

[0088] The active diluents used were ethylamine and isooctyl acrylate in a molar ratio of 1:1;

[0089] The desiccant is molecular sieve 5A;

[0090] The pigment is titanium dioxide 22kg, and the filler is barium sulfate 8kg

[0091] The asparagus polyurea coating is obtained by mixing component A and component B in a ratio of 100:62.

[0092] Example 6

[0093] Component A (parts by weight): Weigh 80kg of polyaspartic acid ester resin, 0.3kg of wetting and dispersing agent, 0.2kg of defoaming agent, 0.5kg of leveling agent, 10kg of reactive diluent, 2kg of desiccant, and 30kg of pigment and filler. Disperse all components uniformly at 1000-1500 rpm, then grind in a sand mill to an acceptable fineness. Filter to obtain Component A.

[0094] The active diluents used were isobutylamine and hydroxyethyl acrylate in a molar ratio of 1:1.02;

[0095] The desiccant is molecular sieve 4A;

[0096] The pigment is titanium dioxide 22kg, and the filler is barium sulfate 8kg

[0097] The asparagus polyurea coating is obtained by mixing component A and component B in a ratio of 100:58.

[0098] Example 7

[0099] Component A (parts by weight): Weigh 80kg of polyaspartic acid ester resin, 0.3kg of wetting and dispersing agent, 0.2kg of defoaming agent, 0.5kg of leveling agent, 10kg of reactive diluent, 2kg of desiccant, and 30kg of pigment and filler. Disperse all components uniformly at 1000-1500 rpm, then grind in a sand mill to an acceptable fineness. Filter to obtain Component A.

[0100] The active diluents used were tert-butylamine and hydroxyethyl acrylate in a molar ratio of 1:1.02;

[0101] The desiccant is molecular sieve 4A;

[0102] The pigment is titanium dioxide 22kg, and the filler is barium sulfate 8kg

[0103] The asparagus polyurea coating is obtained by mixing component A and component B in a ratio of 100:58.

[0104] Example 8

[0105] Component A (parts by weight): Weigh 80kg of polyaspartic acid ester resin, 0.3kg of wetting and dispersing agent, 0.2kg of defoaming agent, 0.5kg of leveling agent, 10kg of reactive diluent, 2kg of desiccant, and 30kg of pigment and filler. Disperse all components uniformly at 1000-1500 rpm, then grind in a sand mill to an acceptable fineness. Filter to obtain Component A.

[0106] The active diluents used were hexylamine and hydroxyethyl acrylate in a molar ratio of 1:1.02;

[0107] The desiccant is molecular sieve 4A;

[0108] The pigment is titanium dioxide 22kg, and the filler is barium sulfate 8kg

[0109] The asparagus polyurea coating is obtained by mixing component A and component B in a ratio of 100:58.

[0110] Example 9

[0111] Component A (parts by weight): Weigh 80kg of polyaspartic acid ester resin, 0.3kg of wetting and dispersing agent, 0.2kg of defoaming agent, 0.5kg of leveling agent, 10kg of reactive diluent, 2kg of desiccant, and 30kg of pigment and filler. Disperse all components uniformly at 1000-1500 rpm, then grind in a sand mill to an acceptable fineness. Filter to obtain Component A.

[0112] The active diluents used were octylamine and hydroxyethyl acrylate in a molar ratio of 1:1.02;

[0113] The desiccant is molecular sieve 4A;

[0114] The pigment is titanium dioxide 22kg, and the filler is barium sulfate 8kg

[0115] The asparagus polyurea coating is obtained by mixing component A and component B in a ratio of 100:58.

[0116] Example 10

[0117] Component A (parts by weight): Weigh 80kg of polyaspartic acid ester resin, 0.3kg of wetting and dispersing agent, 0.2kg of defoaming agent, 0.5kg of leveling agent, 10kg of reactive diluent, 2kg of desiccant, and 30kg of pigment and filler. Disperse all components uniformly at 1000-1500 rpm, then grind in a sand mill to an acceptable fineness. Filter to obtain Component A.

[0118] The active diluents used were cyclohexylamine and hydroxyethyl acrylate in a molar ratio of 1:1.02;

[0119] The desiccant is molecular sieve 4A;

[0120] The pigment is titanium dioxide 22kg, and the filler is barium sulfate 8kg

[0121] The asparagus polyurea coating is obtained by mixing component A and component B in a ratio of 100:58.

[0122] The test results of various indicators of the samples prepared by Examples 5-10 are shown in Table 3.

[0123] Table 3

[0124]

[0125]

[0126] The difference between Comparative Example 4 and 5 is that the ratio of reactive diluent to polyaspartic acid ester resin is the largest, and the viscosity of the resulting coating increases slightly; in Comparative Examples 6-10, only the raw materials for synthesizing the reactive diluent are different, and the change in viscosity of the resulting coating is not as significant as the change in the amount of diluent used. The viscosities of the reactive diluents are all relatively low and the difference is not large, and the impact on the final coating is not a major factor relative to the amount of reactive diluent used; therefore, the slight increase in viscosity in Example 4 compared to 5 is due to the increase in the amount of aspartic acid resin used, rather than the different types of reactive diluent raw materials.

[0127] Example 11

[0128] The difference from Example 10 is that the active diluents used are cyclohexylamine and ethoxyethoxyethyl acrylate, and the molar ratio is 1:1.02.

[0129] Example 12

[0130] The difference from Example 10 is that the active diluents used are cyclohexylamine and hydroxyethyl methacrylate, and the molar ratio is 1:1.02.

[0131] Example 13

[0132] The difference from Example 10 is that the active diluents used are cyclohexylamine and dimethylacrylamide, and the molar ratio is 1:1.02.

[0133] Example 14

[0134] The difference from Example 10 is that the active diluents used are cyclohexylamine and caprolactone acrylate, and the molar ratio is 1:1.02.

[0135] The test results of the coating samples obtained in Examples 11-14 are shown in Table 4.

[0136] Table 4

[0137]

[0138]

[0139] The amines in the active diluent raw materials of Examples 11-14 are all cyclohexylamine, but the double bond compounds are different. Therefore, the experimental results show that as long as the double bond compound is selected from at least one of isooctyl acrylate, ethoxyethoxyethyl acrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, dimethylacrylamide, and caprolactone acrylate; the molar ratio of the amine compound to the double bond compound is 1: (1 to 1.02), and the ratio of the amount to the polyaspartic acid resin is in the range of (10-30): (80-100), the viscosity of the obtained aspartic polyurea coating does not exceed 1000, and it has good operability.

[0140] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An asparagus polyurea coating, characterized in that: The aspartic polyurea coating comprises a component A and a component B, wherein the component A comprises polyaspartic acid ester, a desiccant, a pigment, a filler, a reactive diluent and an additive, and the mass ratio of the components is (80-100):(2-3):(0-80):(10-30):(1-10); the component B is a curing agent; The polyaspartic acid ester is a solvent-free tough polyaspartic acid ester resin with a viscosity of 800±50 cP; The desiccant is a commonly used molecular sieve, which is at least one of 3A, 4A, and 5A types, and the added amount does not exceed 3% of the polyaspartic acid ester; The auxiliary agents include wetting and dispersing agents, defoaming agents and leveling agents; The raw materials for preparing the reactive diluent include amines and double-bond compounds, wherein the amines are selected from at least one of ethylamine, isobutylamine, tert-butylamine, octylamine, hexylamine, and cyclohexylamine, and the double-bond compound is selected from at least one of isooctyl acrylate, ethoxyethoxyethyl acrylate, hydroxyethyl acrylate, hydroxyethyl methacrylate, dimethylacrylamide, and caprolactone acrylate, and the molar ratio of the amine compound to the double-bond compound is 1:(1-1.02); The method for preparing the active diluent is as follows: amines and a compound with a double bond are uniformly mixed, heated to 50-120° C. under nitrogen protection for reaction, and after the reaction is complete, unreacted amines are removed to obtain the active diluent.

2. The asparagus polyurea coating according to claim 1, characterized in that: The reaction takes 3-6 days to complete.

3. The asparagus polyurea coating according to claim 1, characterized in that The filler is at least one of barium sulfate, talc powder and feldspar powder.

4. The asparagus polyurea coating according to claim 1, characterized in that The wetting and dispersing agents are TEGO Dispers628 and BYK110; The defoamer is a composite defoamer mixed with silicone and other polymers; The leveling agent is an acrylate leveling agent or an organosilicon leveling agent with a defoaming function.

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