Prolonged-release compositions and their use

Abstract

The present application relates to a kind of extender composition and its application in polyaspartic ester polyurea composition, and the method for extending the pot life of polyaspartic ester polyurea composition by the extender composition.The extender composition includes 30-80 parts of polyamine resin, 0.01-30 parts of ketone solvent and 10-80 parts of silicon-containing inorganic matter.The extender can effectively improve the pot life of polyaspartic ester polyurea composition, provide sufficient construction operation time for different applications of polyaspartic ester polyurea composition.The polyaspartic ester polyurea composition with extended pot life can be applied to different types of substrates such as metal, concrete, plastic, composite material, etc., while having low-temperature rapid curing, high solid content, low VOC emission, good substrate adhesion and outdoor durability, etc.

Description

Technical Field

[0001] This invention relates to the technical field of coating compositions. Specifically, this invention relates to an extender composition and its application in a polyaspartic ester polyurea composition, as well as a method for using the extender composition to extend the pot life of the polyaspartic ester polyurea composition. Background Technology

[0002] Polyaspartic acid ester (structure shown in Formula I) is a novel aliphatic secondary amine material, prepared by a Michael addition reaction of an aliphatic primary diamine with maleate ester. In this reaction, the aliphatic primary diamine is converted into a secondary amine, reducing the reactivity of the hydrogen atoms on the amino group with the isocyanate group. Simultaneously, due to steric hindrance, the reaction rate is significantly lower than that of the original primary amine group. This slow-reacting yet high-performance material successfully overcomes the shortcomings of traditional sprayed polyurea systems, such as excessively fast reaction rates, difficulty in control, poor adhesion, and reliance on large equipment. Therefore, polyaspartic acid ester has become a high-performance aliphatic polyurea material developed in recent years, also known as a third-generation polyurea material.

[0003]

[0004] The coating formed by polyaspartic acid esters possesses characteristics such as high strength, good adhesion, good weather resistance, non-yellowing, good waterproof barrier properties, strong corrosion resistance, good wear resistance, and good decorative properties. Furthermore, its reaction rate is controllable and it can cure at low temperatures, overcoming the problems of concentrated exothermic reaction, severe thermal shrinkage, and poor adhesion caused by the excessively rapid reaction rate of traditional polyurea. Therefore, polyaspartic acid esters can be applied using various methods such as spraying, scraping, and brushing, and are suitable for application in complex environments such as roads, bridges, tunnels, and marine structures, showing broad application prospects in material protection and corrosion protection. In addition, polyaspartic acid ester polyurea has a high solids content, low VOC emissions, and allows for thicker film thickness with a single coat, saving time and labor, and aligning with the green and environmentally friendly development trend of coating technology.

[0005] However, commercially available polyaspartic ester polyurea generally suffers from a short pot life, ranging from a few minutes to tens of minutes. This is mainly because the reaction between the polyaspartic ester resin and the isocyanate curing agent is too rapid, resulting in insufficient application time and affecting the adhesion of the paint film to the substrate.

[0006] To address the short pot life of polyaspartic ester polyurea, existing technologies mainly focus on improving the process through steric hindrance of the polyaspartic ester resin, solvent dilution, and moisture control, but the effects are limited.

[0007] For example, the reaction rate between polyaspartic ester resin and isocyanate curing agents can be adjusted by utilizing the steric hindrance structure of the resin, thereby improving the pot life of the coating. However, while increasing the pot life, the excessive steric hindrance significantly reduces the drying rate of the coating, which is detrimental to production efficiency.

[0008] Solvent dilution is also a common method to improve the pot life of polyaspartic ester polyurea, but this method reduces the solids content of the coating and increases VOC emissions, which is detrimental to environmental protection. Moisture control can improve the pot life of polyaspartic ester polyurea, but water and humidity in the air are important factors affecting polyaspartic ester polyurea. This is because water molecules can react with isocyanate curing agents to produce polyurea structures, and the exothermic reaction accelerates the pot life of polyaspartic ester polyurea.

[0009] Chinese invention patent application CN105934486A discloses a method for extending the pot life of a coating composition. This method involves bubbling gaseous carbon dioxide into a polyamine solution, utilizing the carbon dioxide to complex with the primary and / or secondary amines in the polyamine to generate carbamates. Maintaining the liquid state can improve the pot life of the reaction mixture. Increasing the temperature accelerates the dissociation of carbon dioxide with the polyamine, thereby facilitating its reaction with a crosslinking agent. However, this method requires a specialized carbon dioxide gas device and the interaction with the polyamine takes five days, which is lengthy, ultimately resulting in a limited improvement in pot life.

[0010] In view of this, it is necessary to provide an extension agent composition for improving the pot life of polyaspartic ester polyurea compositions in order to solve the problems existing in the prior art. Summary of the Invention

[0011] Compositions with extended pot life have been found to be advantageous in the art. Pot life for products such as coatings and adhesives is typically related to curing time. If the pot life is extended, the curing time is correspondingly extended, and a longer pot life is desirable to enable mass production.

[0012] A first aspect of the present invention is to provide an extension agent composition for extending the pot life of a polyaspartic ester polyurea composition, providing sufficient application time for different applications of the polyaspartic ester polyurea composition.

[0013] The elongating agent composition comprises, by weight, 30-80 parts of polyamine resin, 0.01-30 parts of ketone solvent and 10-80 parts of silicon-containing inorganic material.

[0014] Preferably, the elongating agent composition comprises, by weight, 30-60 parts of polyamine resin, 0.01-20 parts of ketone solvent and 20-60 parts of silicon-containing inorganic material.

[0015] More preferably, the elongating agent composition comprises, by weight, 45-60 parts of polyamine resin, 0.01-10 parts of ketone solvent and 35-45 parts of silicon-containing inorganic material.

[0016] In one embodiment of the present invention, the polyamine resin is a primary amine polyamine resin containing at least two or more amino groups and / or a primary amine modified polyamine resin.

[0017] In one embodiment of the present invention, the primary amine polyamine resin is selected from ethylenediamine, isophorone diamine, tetramethylenediamine, hexamethylenediamine, dodecamethylenediamine, m-xylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, or combinations thereof.

[0018] In one embodiment of the present invention, the primary amine modified polyamine resin is selected from polyether modified polyamine resin, epoxy modified polyamine resin, carbonyl compound modified polyamine resin, phenolic modified polyamine resin, polyaspartic acid ester polyamine resin, or a combination thereof.

[0019] In one embodiment of the present invention, the polyether-modified polyamine resin is, for example, but not limited to, Huntsman's commercially available JEFFAMINE D-230, JEFFAMINE D-400, JEFFAMINE D-2000, JEFFAMINE D-4000, JEFFAMINET-403, JEFFAMINE T-3000, or combinations thereof.

[0020] In one embodiment of the present invention, the epoxy-modified polyamine resin includes at least one of the group consisting of epoxy resin and amine adducts, glycidyl ether and amine adducts, and epoxy alkane and amine adducts.

[0021] In one embodiment of the present invention, the carbonyl compound modified polyamine resin includes ketimine polyamine substances formed by reacting ethylenediamine, diethylenetriamine with acetone, butanone, and methyl isobutyl ketone.

[0022] In one embodiment of the present invention, the phenolic modified polyamine resin is selected from polyamine resins formed by formaldehyde, p-hydroxybenzaldehyde, phenol or octylphenol modified ethylenediamine, hexamethylenediamine, diethylenetriamine, and m-phenylenediamine.

[0023] In one embodiment of the present invention, the polyaspartic ester polyamine resin is a secondary amine polyamine resin containing sterically hindered groups, such as, but not limited to, at least one of the group consisting of Desmophen NH1220, Desmophen NH1420, Desmophen NH1423, Desmophen NH1520, Desmophen NH2850, Desmophen NH2885, and Desmophen NH2886 commercially available from Bayer Materials, and F220, F420, F520, F524, and F525 commercially available from Zhuhai Feiyang.

[0024] In one embodiment of the present invention, the ketone solvent is selected from acetone, methyl ethyl ketone, methyl isobutyl ketone, methyl isopentyl ketone, cyclohexanone, 2-heptanone, isophorone, 2,4-pentanedione, or combinations thereof.

[0025] In one embodiment of the present invention, the silicon-containing inorganic material is crystalline silicon or amorphous silicon. Preferably, the silicon-containing inorganic material is in the form of silicate powder.

[0026] In one embodiment of the present invention, the silicon-containing inorganic material is selected from silicon dioxide, silicates, aluminosilicates, or combinations thereof.

[0027] A second aspect of the present invention is to provide a polyaspartic acid ester polyurea composition comprising the elongation agent composition provided in the first aspect of the present invention.

[0028] A third aspect of the present invention is to provide a method for extending the pot life of a polyaspartic acid ester polyurea composition, comprising the steps of:

[0029] (1) The aforementioned elongation composition, polyaspartic ester resin, optional first solvent, optional filler and optional additive are provided to be mixed to obtain component A of the polyaspartic ester polyurea composition;

[0030] (2) Component B includes an isocyanate curing agent and an optional second solvent;

[0031] (3) Mix component A and component B at a weight ratio of 1:10 to 10:1 to obtain the polyaspartic acid ester polyurea composition.

[0032] In one embodiment of the present invention, the weight ratio of component A to component B is in the range of 1:5 to 5:1.

[0033] In one embodiment of the present invention, component A of the polyaspartic ester polyurea composition comprises: 50-95 parts by weight of polyaspartic ester resin, 1-30 parts by weight of an elongation agent composition, 0-30 parts by weight of a first solvent, 0-10 parts by weight of filler, and 0-10 parts by weight of additives.

[0034] In one embodiment of the present invention, component B of the polyaspartic ester polyurea composition comprises: 60 to 100 parts by weight of isocyanate curing agent and 0 to 40 parts by weight of second solvent.

[0035] In one embodiment of the present invention, the polyaspartic ester resin is a secondary amine polyamine resin containing sterically hindered groups, such as, but not limited to, at least one of the group consisting of Desmophen NH1220, Desmophen NH1420, Desmophen NH1423, Desmophen NH1520, Desmophen NH2850, Desmophen NH2885, and Desmophen NH2886 commercially available from Bayer Materials, and F220, F420, F520, F524, and F525 commercially available from Zhuhai Feiyang.

[0036] In one embodiment of the present invention, the isocyanate curing agent may be an aromatic or aliphatic isocyanate, comprising one or more isocyanate groups. The isocyanate curing agent is selected from aliphatic isocyanate monomers, aliphatic isocyanate dimers, aliphatic isocyanate trimers, aliphatic isocyanate polymers, or combinations thereof.

[0037] In one embodiment of the present invention, the isocyanate curing agent is an alicyclic isocyanate, selected from alicyclic isocyanate monomers, alicyclic isocyanate dimers, alicyclic isocyanate trimers, alicyclic isocyanate polymers, or combinations thereof.

[0038] In one embodiment of the present invention, the isocyanate curing agent is an aromatic isocyanate, selected from aromatic isocyanate monomers, aromatic isocyanate dimers, aromatic isocyanate trimers, aromatic isocyanate polymers, or combinations thereof.

[0039] In one embodiment of the present invention, the isocyanate curing agent is selected from isocyanate hybrids, isocyanate hybrid dimers, isocyanate hybrid trimers, isocyanate hybrid polymers, or combinations thereof.

[0040] In one embodiment of the present invention, the aliphatic isocyanate is selected from tetramethylene 1,4-diisocyanate, hexamethylene 1,6-diisocyanate, 2,2,4-trimethylhexane 1,6-diisocyanate, ethylene diisocyanate, 1,12-dodecane diisocyanate, or combinations thereof.

[0041] In one embodiment of the present invention, the alicyclic isocyanate is selected from isophorone diisocyanate, cyclobutane 1,3-diisocyanate, cyclohexane 1,3-diisocyanate, cyclohexane 1,4-diisocyanate, methylcyclohexyl diisocyanate, 4,4'-methylene dicyclohexyl diisocyanate, hydrogenated diphenylmethane diisocyanate, or combinations thereof.

[0042] In one embodiment of the present invention, the aromatic isocyanate is selected from toluene 2,4-diisocyanate, toluene 2,6-diisocyanate, diphenylmethane 4,4'-diisocyanate, diphenylmethane 2,4'-diisocyanate, p-phenylene diisocyanate, biphenyl diisocyanate, 3,3'-dimethyl-4,4'-diphenylene diisocyanate, hexahydrophenylene 1,3-diisocyanate, or combinations thereof.

[0043] In one embodiment of the present invention, the isocyanate curing agent is, for example, but not limited to, Desmodur N3300, Desmodur N 3390, Desmodur N 3600, Desmodur N 3900 and Desmodur Z4470 commercially available from Bayer Materials, HDT-90, HDT-100 and HDT-LV commercially available from Rodia Group, and GB925-85, GB950-90 and GB905-85 curing agents commercially available from Zhuhai Feiyang.

[0044] In one embodiment of the present invention, the first solvent in component A and the second solvent in component B of the polyaspartic ester polyurea composition are the same or different, and are independently selected from toluene, xylene, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, isophorone, butyl acetate, ethyl acetate, ethyl 3-ethoxypropionate, propylene glycol methyl ether acetate, propylene glycol ethyl ether acetate, ethylene glycol butyl ether acetate, ethylene glycol ethyl ether acetate, solvent oil No. 100, solvent oil No. 150, solvent oil No. 200, or combinations thereof.

[0045] The first solvent can dissolve the aspartic resin and the elongation agent composition. The second solvent can dissolve the isocyanate curing agent.

[0046] In one embodiment of the present invention, both the first solvent and the second solvent are composite solvents, including a composite solvent of butyl acetate and propylene glycol methyl ether acetate, wherein the mass ratio of butyl acetate to propylene glycol methyl ether acetate is in the range of 1:2 to 2:1, preferably 1:1, 1:1.5 or 1.5:1, etc.

[0047] In one embodiment of the present invention, the filler is selected from titanium dioxide, light calcium carbonate, heavy calcium carbonate, talc, glass micro powder, barium sulfate, fumed silica, or a combination thereof.

[0048] In one embodiment of the present invention, the additive is selected from ultraviolet light absorbers, light stabilizers, substrate wetting agents, wetting and dispersing agents, leveling agents, rheology modifiers, or combinations thereof. Those skilled in the art will understand that the additive can be selected according to actual process requirements, and the scope of the present invention is not limited to the additives listed above.

[0049] A fourth aspect of the present invention is to provide a use of a polyaspartic acid ester polyurea composition for applications in coatings, adhesives, and sealants. In particular, it is used in general industrial coatings, automotive coatings, waterproof coatings, engineering coatings, and sealant grouting.

[0050] The pot life of the polyaspartic ester polyurea composition described in this invention can improve the pot life of the polyaspartic ester polyurea composition, providing sufficient application time for different applications. Secondly, the polyaspartic ester polyurea composition containing the pot life of the pot life of the polyaspartic ester polyurea composition has high solids content, low VOC emissions, high hardness and flexibility, good weather resistance, low-temperature rapid curing performance, water resistance, high adhesion to various substrates, and chemical resistance. Thirdly, the polyaspartic ester polyurea composition can be applied to various substrates such as metals, concrete, plastics, and composite materials, and therefore can be widely used in general industrial coatings, automotive original equipment paints, automotive refinish paints, waterproof coatings, engineering coatings, and tile grouting. Detailed Implementation

[0051] Terminology Explanation

[0052] As used herein, the term "polymer" encompasses, on the one hand, a collection of macromolecules that are chemically homogeneous but differ in degree of polymerization, molar mass, and chain length, and are prepared through polymerization reactions (chain-growing addition polymerization, addition polymerization, condensation polymerization, and free radical polymerization). Furthermore, the term also includes derivatives of such macromolecular collections derived from polymerization reactions. The term also includes so-called prepolymers, which are reactive oligomeric pre-adducts in which functional groups participate in the construction of macromolecules.

[0053] As used herein, substance names beginning with "poly(poly)", such as polyisocyanates, refer to substances that, in form, contain two or more functional groups appearing in their name per molecule. The compound can be a monomer, oligomer, or polymer. For example, a polyisocyanate is a compound having two or more isocyanate groups.

[0054] As used herein, "pot life" can be understood as the permissible time after mixing the polyaspartic ester resin containing the extender composition with the isocyanate curing agent. In the automotive and industrial coatings field, it can also be understood as the time required for the initial viscosity to double, where the initial viscosity is the viscosity measured immediately after mixing component A and component B of the polyaspartic ester polyurea composition. In the waterproof coatings field, "pot life" can also be expressed as the gel time of the polyaspartic ester polyurea composition, i.e., the time required for it to transform from a flowable liquid to a solid gel at a specified temperature. In the grout and adhesives field, "pot life" is expressed as the surface drying time of the polyaspartic ester polyurea composition, i.e., the time it takes for the surface to dry after mixing component A and component B of the polyaspartic ester polyurea composition and applying it to a metal or ceramic substrate. Surface drying time can be tested using the national standard GB / T 1728-1979 (1989).

[0055] The technical solution of the present invention will be described in detail below with reference to specific embodiments. It should be understood that the following specific embodiments are only used to help those skilled in the art understand the present invention, and are not intended to limit the present invention.

[0056] Example 1: Preparation of elongation agent compositions 1 and 2

[0057] This embodiment provides an elongation agent composition 1 and 2. The formulations of elongation agent compositions 1 and 2, by weight, are shown in Table 1 below:

[0058] Table 1

[0059] Raw material name Extension agent composition 1 Extension agent composition 2 Desmophen NH1420 59.99 copies 45 copies Methyl ethyl ketone 0.01 copies 10 copies silicate micro powder 40 copies 40 copies

[0060] The specific steps for preparing the above-mentioned elongation agent compositions 1 and 2 are as follows:

[0061] Under stirring, Desmophen NH1420, methyl ethyl ketone and silicate powder are added sequentially to the main container and stirred for 15 to 30 minutes at a stirring speed of 500 to 1500 rpm until they are mixed evenly, thus obtaining elongation agent compositions 1 and 2.

[0062] Example 2

[0063] This embodiment provides an application of a polyaspartic acid ester polyurea composition in the field of waterproof coatings.

[0064] Polyaspartic acid ester polyurea waterproof coating-1 and polyaspartic acid ester polyurea waterproof coating-2 each comprise component A and component B, respectively, with formulations shown in Table 2 below:

[0065] Table 2

[0066]

[0067] It should be noted that the above-mentioned polyaspartic acid ester polyurea waterproof coating-1 does not contain the extension agent composition 1, and is therefore only used as a comparison.

[0068] The specific steps for preparing the above-mentioned polyaspartic ester polyurea waterproof coating-1 and polyaspartic ester polyurea waterproof coating-2 are as follows:

[0069] (1) Under stirring, add Desmophen NH1420, F520 and titanium dioxide sequentially to the main container, and stir for 10 to 15 minutes at a stirring speed of 500 to 1500 rpm. After mixing evenly, slowly add leveling agent, defoamer and optional extension agent composition 1, and continue stirring for 15 to 20 minutes to obtain component A of polyaspartic ester polyurea waterproof coating-1 and polyaspartic ester polyurea waterproof coating-2.

[0070] (2) Under nitrogen protection, Desmodur N 3900 isocyanate curing agent and GB905-85 curing agent are stirred and mixed for 10 to 15 minutes, with the stirring rate controlled at 500 to 1500 rpm, to obtain component B of polyaspartic ester polyurea waterproof coating-1 and polyaspartic ester polyurea waterproof coating-2.

[0071] (3) When using, mix component A and component B thoroughly in a weight ratio of 1:5 to 5:1 to obtain the polyaspartic acid ester polyurea waterproof coating-1 and polyaspartic acid ester polyurea waterproof coating-2.

[0072] The mixed polyaspartic ester polyurea waterproof coating-1 and polyaspartic ester polyurea waterproof coating-2 can then be tested for their applicable period.

[0073] The pot life of polyaspartic ester polyurea waterproof coating-1 and polyaspartic ester polyurea waterproof coating-2 was tested by gel time and found to be 10 minutes and 20 minutes respectively, indicating that the extension agent composition can significantly improve the pot life of polyaspartic ester polyurea waterproof coating.

[0074] Example 3

[0075] This embodiment provides an application of a polyaspartic acid ester polyurea composition in the field of tile grout.

[0076] The polyaspartic acid ester polyurea grout sealant-1 and polyaspartic acid ester polyurea grout sealant-2 respectively comprise component A and component B. The formulations are shown in Table 3 below:

[0077] Table 3

[0078]

[0079] It should be noted that the above-mentioned polyaspartic acid ester polyurea grout sealant-1 does not contain the extender composition 1, and is therefore only used as a comparison.

[0080] The specific steps for preparing the above-mentioned polyaspartic acid ester polyurea grout sealant-1 and polyaspartic acid ester polyurea grout sealant-2 are as follows:

[0081] (1) Under stirring, add Desmophen NH1420, F520, optional elongation agent composition 1 and titanium dioxide sequentially to the main container, and stir for 10 to 15 minutes at a stirring speed of 500 to 1500 rpm. After mixing evenly, slowly add fumed silica and continue stirring for 15 to 20 minutes to obtain component A.

[0082] (2) Component B directly uses Desmodur N 3900 isocyanate curing agent.

[0083] (3) When using, mix component A and component B thoroughly in a weight ratio of 1:5 to 5:1 to obtain the polyaspartic acid ester polyurea grout sealant-1 and polyaspartic acid ester polyurea grout sealant-2.

[0084] Apply polyaspartic acid ester polyurea grout sealant-1 and polyaspartic acid ester polyurea grout sealant-2 to the tile substrate, and then test the applicable period.

[0085] The pot life of polyaspartic acid ester polyurea grout sealant-1 and polyaspartic acid ester polyurea grout sealant-2 was tested using the surface drying time method as specified in GB / T 1728-1979(1989). The tests revealed that the pot life of polyaspartic acid ester polyurea grout sealant-1 and polyaspartic acid ester polyurea grout sealant-2 were 10 minutes and 25 minutes, respectively. This indicates that the pot life extension agent composition can significantly improve the pot life of polyaspartic acid ester polyurea grout sealant.

[0086] Example 4

[0087] This embodiment provides an application of polyaspartic acid ester polyurea automotive clear coat.

[0088] The polyaspartic acid ester polyurea automotive clear coat-1 and polyaspartic acid ester polyurea automotive clear coat-2 comprise component A and component B. The formulations are shown in Table 4 below:

[0089] Table 4

[0090]

[0091] It should be noted that the above-mentioned polyaspartic acid ester polyurea automotive clear coat-1 does not contain the elongation agent composition 2, and is therefore only used as a comparison.

[0092] The specific steps for preparing the above-mentioned polyaspartic ester polyurea automotive clear coat-1 and polyaspartic ester polyurea automotive clear coat-2 are as follows:

[0093] (1) Under stirring, Desmophen NH1420, F520, butyl acetate, and propylene glycol methyl ether acetate are added sequentially to the main container. The mixture is stirred for 10 to 15 minutes at a stirring speed of 500 to 1500 rpm until it is homogeneous. Then, the substrate wetting agent, leveling agent, rheology modifier, UV absorber, light stabilizer, and optional elongation agent composition 2 are added sequentially. The mixture is stirred for another 15 to 20 minutes to obtain component A of polyaspartic ester polyurea automotive clear coat-1 and polyaspartic ester polyurea automotive clear coat-2. The viscosity of component A at 23°C is 100 to 20000 mPa·s.

[0094] (2) Nitrogen gas was introduced into the composite solvent of butyl acetate and propylene glycol methyl ether acetate. Under stirring, the isocyanate curing agent Desmodur N 3900 was added and stirred for 10 to 20 minutes to obtain component B of polyaspartic ester polyurea automotive clear coat-1 and polyaspartic ester polyurea automotive clear coat-2.

[0095] (3) When using, mix component A and component B thoroughly in a weight ratio of 1:5 to 5:1 to obtain the polyaspartic acid ester polyurea automotive clear coat-1 and polyaspartic acid ester polyurea automotive clear coat-2.

[0096] The resulting polyaspartic ester polyurea automotive clear coat-1 and polyaspartic ester polyurea automotive clear coat-2 can be tested for their service life.

[0097] The pot life of polyaspartic ester polyurea automotive clearcoat-1 and polyaspartic ester polyurea automotive clearcoat-2 was tested by doubling the initial viscosity, where the initial viscosity was measured immediately after mixing components A and B of the polyaspartic ester polyurea composition. The test revealed that the pot life of polyaspartic ester polyurea automotive clearcoat-1 and polyaspartic ester polyurea automotive clearcoat-2 were 9 minutes and 35 minutes, respectively, indicating that this pot life extender composition can significantly improve the pot life of polyaspartic ester polyurea automotive clearcoat.

[0098] Example 5

[0099] This embodiment provides a general industrial coating topcoat application for polyaspartic ester polyurea.

[0100] The polyaspartic acid ester polyurea industrial coating topcoat-1 and polyaspartic acid ester polyurea industrial coating topcoat-2 comprise component A and component B. The formulations are shown in Table 5 below:

[0101] Table 5

[0102]

[0103] It should be noted that the above-mentioned polyaspartic acid ester polyurea industrial coating topcoat-1 does not contain the extension agent composition 2, and is therefore only used as a comparison.

[0104] The specific steps for preparing the above-mentioned polyaspartic ester polyurea industrial coating topcoat-1 and polyaspartic ester polyurea industrial coating topcoat-2 are as follows:

[0105] (1) Under stirring, Desmophen NH1420, F520, titanium dioxide, butyl acetate and propylene glycol methyl ether acetate are added to the main container in sequence. Stir for 10 to 15 minutes, and control the stirring rate at 500 to 1500 rpm to make it evenly mixed. Then, use a high-speed grinder to grind it to a fineness of less than 15 micrometers.

[0106] (2) Add the substrate wetting agent, leveling agent, rheology modifier, ultraviolet absorber, light stabilizer, and optional extension agent composition 2 sequentially to the ground mixture, and continue stirring for 15 to 20 minutes to obtain component A of polyaspartic ester polyurea industrial coating topcoat-1 and polyaspartic ester polyurea industrial coating topcoat-2. The viscosity range of component A at 23°C is 100 to 20000 mPa·s.

[0107] (2) Nitrogen gas is introduced into the composite solvent of butyl acetate and propylene glycol methyl ether acetate. Under stirring, the isocyanate curing agent Desmodur N 3900 is added and stirred for 10 to 20 minutes to obtain component B of polyaspartic acid ester polyurea industrial coating topcoat-1 and polyaspartic acid ester polyurea industrial coating topcoat-2.

[0108] (3) When using, mix component A and component B thoroughly in a weight ratio of 1:5 to 5:1 to obtain the polyaspartic acid ester polyurea industrial coating topcoat-1 and polyaspartic acid ester polyurea industrial coating topcoat-2.

[0109] The mixed polyaspartic ester polyurea industrial coating topcoat-1 and polyaspartic ester polyurea industrial coating topcoat-2 can be tested for their pot life.

[0110] The pot life of polyaspartic ester polyurea industrial coating topcoat-1 and polyaspartic ester polyurea industrial coating topcoat-2 was tested by doubling the initial viscosity, where the initial viscosity was measured immediately after mixing components A and B of the polyaspartic ester polyurea industrial coating topcoat. The test revealed that the pot life of polyaspartic ester polyurea industrial coating topcoat-1 and polyaspartic ester polyurea industrial coating topcoat-2 were 12 minutes and 45 minutes, respectively, indicating that this pot life extender composition can significantly improve the pot life of polyaspartic ester polyurea industrial coating topcoat.

[0111] Comparison results

[0112] Through comparison of Examples 2, 3, 4, and 5, it was found that the extension agent composition can effectively improve the pot life of the polyaspartic ester polyurea composition, and respectively improve the operating time of the polyaspartic ester polyurea composition in various application scenarios such as waterproof coatings, sealant, automotive coatings, and industrial coatings.

[0113] The present invention has been described by the above-described embodiments; however, these embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the present invention. Conversely, modifications and equivalents contained within the spirit and scope of the claims are included within the scope of the present invention.

Claims

1. An extender composition for extending the pot life of a polyaspartic ester polyurea composition, wherein, The extender composition comprises 30 to 80 parts by weight of a polyamine resin, 0.01 to 30 parts by weight of a ketone solvent, and 10 to 80 parts by weight of a silicon-containing inorganic substance, characterized in that: The ketone solvent is selected from the group consisting of acetone, methyl ethyl ketone, methyl isobutyl ketone, methyl isopentyl ketone, cyclohexanone, 2-heptanone, isophorone, 2,4-pentanedione, or a combination thereof. The silicon-containing inorganic substance is selected from the group consisting of silicon dioxide, silicate, aluminosilicate, or a combination thereof.

2. The extender composition of claim 1, wherein The polyamine resin is a primary amine-based polyamine resin having at least two or more amino groups and / or a primary amine-modified polyamine resin.

3. A polyaspartate polyurea composition, characterized in that, An extender composition as claimed in claim 1 or 2.

4. A method for extending the pot life of a polyaspartic ester polyurea composition, comprising the steps of: (1) providing an extender composition as claimed in claim 1 or 2, a polyaspartic ester resin, an optional first solvent, an optional filler, and an optional adjuvant, and mixing them to obtain an A component of the polyaspartic ester polyurea composition; (2) providing a B component comprising an isocyanate curing agent and an optional second solvent; and (3) mixing the A component and the B component in a weight ratio of 1:10 to 10:1 to obtain the polyaspartic ester polyurea composition.

5. The method of claim 4, wherein, The A component of the polyaspartic ester polyurea composition comprises 50 to 95 parts by weight of a polyaspartic ester resin, 1 to 30 parts by weight of the extender composition, 0 to 30 parts by weight of a first solvent, 0 to 10 parts by weight of a filler, and 0 to 10 parts by weight of an adjuvant.

6. The method of claim 4, wherein, The B component of the polyaspartic ester polyurea composition comprises 60 to 100 parts by weight of an isocyanate curing agent, and 0 to 40 parts by weight of a second solvent.

7. The method of claim 4, wherein, The first solvent in the A component and the second solvent in the B component of the polyaspartic ester polyurea composition are independently selected from the group consisting of toluene, xylene, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, isophorone, butyl acetate, ethyl acetate, ethyl 3-ethoxypropionate, propylene glycol methyl ether acetate, propylene glycol ethyl ether acetate, ethylene glycol butyl ether acetate, ethylene glycol ethyl ether acetate, 100# solvent oil, 150# solvent oil, 200# solvent oil, or a combination thereof.

8. Use of the polyaspartic ester polyurea composition as claimed in claim 3 in coatings, adhesives, and sealants.

Images