Quick-drying high-hardness coating composition based on cyclohexane diisocyanate tripolymer

Abstract

The invention discloses a quick-drying high-hardness coating composition based on a cyclohexane diisocyanate tripolymer, which comprises a coating part and a curing agent part, and the curing agent part comprises the cyclohexane diisocyanate tripolymer. The six-membered ring structure of the cyclohexane diisocyanate tripolymer has high symmetry and low polarity, the rigidity of a molecular chain is enhanced, the random entanglement of the molecular chain is reduced, the spatial arrangement of an active group-NCO is more ordered, higher molecular movement capability can be maintained, and effective collision of reactive groups is promoted, so that rapid curing is realized. The hexamethylene diisocyanate trimer six-membered ring structure reduces molecular chain entanglement, promotes three-dimensional network formation, and improves the crosslinking density, thereby improving the hardness of the coating.

Description

Technical Field

[0001] This invention relates to the field of coatings, and more specifically to a fast-drying, high-hardness coating composition based on cyclohexane diisocyanate trimer. Background Technology

[0002] The coatings industry has been committed to developing environmentally friendly, high-performance coatings to replace traditional solvent-based coatings. Traditional curing agents suffer from high volatility, high toxicity, and insufficient weather resistance. The limited cross-linking density of conventional trimers results in unsatisfactory coating hardness, chemical corrosion resistance, and yellowing resistance. Furthermore, traditional coatings have slow curing speeds, affecting application efficiency.

[0003] Cyclohexane diisocyanate trimer has not been fully utilized due to its rigid six-membered ring structure. Cyclohexane diisocyanate trimer possesses high symmetry and low polarity, which can optimize coating performance. Its six-membered ring structure exhibits high symmetry and low polarity, enhancing molecular chain rigidity, reducing random chain entanglement, and resulting in a more ordered spatial arrangement of active groups (-NCO), thereby increasing crosslinking density.

[0004] Developing high-performance coating compositions using cyclohexane diisocyanate trimer as a crosslinking agent can effectively solve the problems existing in traditional coatings, achieve rapid curing, and improve coating hardness through high crosslinking density, which has important theoretical significance and application value.

[0005] Several invention patent applications have been filed to address issues such as the hardness and curing rate of coating compositions. For example: The patent specification with publication number CN103756538A discloses a method for preparing a fast-drying coating using modified acrylic resin and HDI trimer curing agent. The HDI has a relatively long straight chain, resulting in low coating hardness.

[0006] The patent specification with publication number CN118852581A discloses a method of using a blend of IPDI trimer and HDI trimer as a curing agent. By introducing rigid rings, the curing speed, hardness, weather resistance, and corrosion resistance of the coating are improved. However, the process is complex and increases costs. At the same time, because the three NCOs of IPDI trimer have large differences in activity, it can lead to incomplete local reactions and low crosslinking density, which affects the performance of the coating. Therefore, it is necessary to modify the IPDI trimer to improve the performance. Summary of the Invention

[0007] To address the technical problems described in the background section and the shortcomings existing in this field, the present invention provides a fast-drying, high-hardness coating composition based on cyclohexane diisocyanate trimer, using cyclohexane diisocyanate trimer as a crosslinking agent, which can solve the problems of insufficient coating hardness and low curing speed in the prior art. The specific technical solution is as follows: In a first aspect, the present invention provides a fast-drying, high-hardness coating composition based on cyclohexane diisocyanate trimer, comprising a coating portion and a curing agent portion, wherein the curing agent portion comprises cyclohexane diisocyanate trimer.

[0008] The cyclohexane diisocyanate trimer preferably includes at least one of 1,2-cyclohexane diisocyanate trimer, 1,3-cyclohexane diisocyanate trimer, and 1,4-cyclohexane diisocyanate trimer, and more preferably includes 1,4-cyclohexane diisocyanate trimer, which can further improve the hardness and curing speed of the coating.

[0009] In some preferred embodiments, the fast-drying, high-hardness coating composition based on cyclohexane diisocyanate trimer described in the first aspect has a mass ratio of coating portion to curing agent portion of 1.2 to 10:1, for example, 1.4:1, 1.5:1, 2:1, 2.1:1, 2.5:1, 3:1, 4:1, 5:1, 6:1, 7:1, 8:1, 9:1, etc.

[0010] In some preferred embodiments, the fast-drying, high-hardness coating composition based on cyclohexane diisocyanate trimer described in the first aspect includes a coating portion comprising a resin and a first organic solvent. Further, in the coating portion, the mass ratio of the resin to the first organic solvent is preferably 60-100:10-90, for example, 100:30, 100:40, etc.

[0011] In some preferred embodiments, the fast-drying, high-hardness coating composition based on cyclohexane diisocyanate trimer described in the first aspect contains an active hydrogen atom in the resin. For example, the resin preferably includes at least one selected from hydroxyl acrylic resin, alkyd resin, epoxy resin, polyurethane resin, phenolic resin, etc., and more preferably at least one selected from hydroxyl acrylic resin and alkyd resin.

[0012] In some preferred embodiments, the fast-drying, high-hardness coating composition based on cyclohexane diisocyanate trimer described in the first aspect, wherein the first organic solvent includes at least one of butyl acetate and xylene.

[0013] In some preferred embodiments, the fast-drying, high-hardness coating composition based on cyclohexane diisocyanate trimer described in the first aspect further includes a second organic solvent in the curing agent portion. Further, in the curing agent portion, the mass ratio of the cyclohexane diisocyanate trimer to the second organic solvent is preferably 50-70:30-80, for example, 1:1.

[0014] In some preferred embodiments, the fast-drying, high-hardness coating composition based on cyclohexane diisocyanate trimer described in the first aspect, wherein the second organic solvent includes at least one of butyl acetate and xylene.

[0015] The fast-drying, high-hardness coating composition based on cyclohexane diisocyanate trimer described in the first aspect can be prepared by conventional methods in the art, for example, by mixing the coating portion and the curing agent portion to obtain the fast-drying, high-hardness coating composition based on cyclohexane diisocyanate trimer.

[0016] As a general inventive concept, in a second aspect, the present invention provides the application of cyclohexane diisocyanate trimer as a curing agent (crosslinking agent) for shortening coating drying time and improving coating hardness. The cyclohexane diisocyanate trimer preferably includes at least one of 1,2-cyclohexane diisocyanate trimer, 1,3-cyclohexane diisocyanate trimer, and 1,4-cyclohexane diisocyanate trimer, and more preferably includes 1,4-cyclohexane diisocyanate trimer. Preferably, the cyclohexane diisocyanate trimer is added at a rate of 4% to 30% (e.g., 5%, 10%, 15%, 20%, 25%, etc.) of the total mass of the coating composition.

[0017] As a general inventive concept, in a third aspect, the present invention provides a method for promoting fast drying and high hardness of coatings, comprising: adding a cyclohexane diisocyanate trimer as a curing agent (crosslinking agent) to the coating. The cyclohexane diisocyanate trimer preferably includes at least one selected from 1,2-cyclohexane diisocyanate trimer, 1,3-cyclohexane diisocyanate trimer, and 1,4-cyclohexane diisocyanate trimer, and more preferably includes 1,4-cyclohexane diisocyanate trimer. Preferably, the cyclohexane diisocyanate trimer is added at a rate of 4% to 30% (e.g., 5%, 10%, 15%, 20%, 25%, etc.) of the total mass of the coating composition after addition.

[0018] The inventors hereby provide a preferred method for preparing the cyclohexane diisocyanate trimer of the present invention, comprising: In an inert atmosphere, cyclohexane diisocyanate monomers undergo polymerization in the presence of a catalyst. The reaction is terminated after the cyclohexane diisocyanate monomers reach a certain conversion rate. The resulting reaction solution is separated and purified to obtain the cyclohexane diisocyanate trimer.

[0019] In this invention, the inert gas refers to a gaseous atmosphere that does not participate in the reaction, such as a nitrogen atmosphere.

[0020] In the method for preparing the cyclohexane diisocyanate trimer, the catalyst may include at least one of quaternary ammonium base catalysts and quaternary ammonium salt catalysts, preferably including choline hydroxide, trimethylhydroxyethyl ammonium hydroxide, tetramethyl ammonium hydroxide, tetraethyl ammonium hydroxide, tetrapropyl ammonium hydroxide, tetrabutyl ammonium hydroxide, benzyltrimethyl ammonium hydroxide, hexamethyl diammonium hydroxide, and 2-hydroxy-N,N,N-trimethyl-1-propylaminocarbamate. The catalyst may be used as a pure substance or optionally dissolved / dispersed in a diluent (e.g., an alcohol) at any concentration. As a diluent for the catalyst, the alcohol may include at least one of monohydric alcohols and dihydric alcohols, preferably including one or more of C1-C10 aliphatic alcohols, aryl aliphatic alcohols, aromatic alcohols, aliphatic phenols, aryl aliphatic phenols, and aromatic phenols, such as isooctanol.

[0021] In the method for preparing the cyclohexane diisocyanate trimer, the polymerization temperature can be 50~80℃, for example 60℃, 70℃, etc., preferably 70℃.

[0022] In the method for preparing cyclohexane diisocyanate trimer described in this invention, the reaction conversion rate (or simply conversion rate) is defined as the mass ratio of the initially generated cyclohexane diisocyanate to the mass of the converted cyclohexane diisocyanate. The cyclohexane diisocyanate monomer can be quantified by gel chromatography to monitor the reaction conversion rate. Furthermore, the gel chromatography instrument can be an LC-20AD / RID-10A, and the chromatographic column can be a Shimadzu MZ-Gel SDplus 10E3A 5 μm (8.0×300 mm), MZ-Gel SDplus 500A 5 μm (8.0×300 mm), or MZ-Gel SDplus 100A 5 μm (8.0×300 mm) in series; the mobile phase is chloroform; the flow rate is 1.0 mL / min; the analysis time is 35 min; and the column temperature is 35℃.

[0023] In some embodiments, in the method for preparing the cyclohexane diisocyanate trimer, the reaction is terminated when the mass of cyclohexane diisocyanate consumed accounts for 10% to 80%, preferably 30% to 70%, of the initial total mass.

[0024] In the method for preparing the cyclohexane diisocyanate trimer, the reaction can be terminated by adding a terminator. The terminator may include one or more of acyl chlorides, sulfonates, alkyl phosphates, and sulfates, preferably one or more of formic acid, benzoic acid, benzoyl chloride, dibutyl phosphate, and diisooctyl phosphate. The amount of the terminator may be 80% to 120% of the molar amount of the catalyst.

[0025] In the method for preparing the cyclohexane diisocyanate trimer, the separation and purification can be carried out using one or more of the following: flash evaporator, falling film evaporator, thin film evaporator, and short-path evaporator.

[0026] In the method for preparing the cyclohexane diisocyanate trimer, the separation and purification can be carried out by vacuum distillation to remove unreacted monomers, the temperature can be 150~200℃, such as 160℃, 170℃, etc., and the vacuum degree can be 10~3000 Pa, such as 20 Pa, etc.

[0027] Preferably, the cyclohexane diisocyanate trimer prepared by the method described above has a cyclohexane diisocyanate monomer content of less than 0.2 wt%.

[0028] Compared with the prior art, the beneficial effects of this invention are as follows: 1) The six-membered ring structure of cyclohexane diisocyanate trimer (especially 1,4-cyclohexane diisocyanate trimer) has high symmetry and low polarity, which enhances the rigidity of the molecular chain, reduces the random entanglement of the molecular chain, makes the spatial arrangement of the active groups (-NCO) more orderly, maintains high molecular mobility, promotes the effective collision of reactive groups, and thus cures quickly.

[0029] 2) The six-membered ring structure of cyclohexane diisocyanate trimer (especially 1,4-cyclohexane diisocyanate trimer) reduces molecular chain entanglement, promotes the formation of three-dimensional network, and increases crosslinking density, thereby improving coating hardness. Detailed Implementation

[0030] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0031] Unless otherwise specified, the operating methods in the following examples are generally performed under conventional conditions or as recommended by the manufacturer.

[0032] Example 1: 500g of 1,4-cyclohexane diisocyanate monomer was added to a flask and stirred and heated to 70°C under nitrogen protection. After the temperature stabilized, 2g of a 0.5wt% 2-hydroxy-N,N,N-trimethyl-1-propylcarbamate catalyst dispersion in isooctanol solvent was added and the mixture was stirred to react. When the conversion rate reached 40%, 0.197g of diisooctyl phosphate was added to terminate the reaction and obtain a reaction solution. The reaction solution was then distilled using a short-path evaporator at 160°C and 10Pa to obtain a polyisocyanate composition with a 1,4-cyclohexane diisocyanate monomer content of less than 0.2wt%, namely, 1,4-cyclohexane diisocyanate trimer.

[0033] Take 100g of 1,4-cyclohexane diisocyanate trimer, add 50g of butyl acetate and 50g of xylene, and disperse evenly to obtain the curing agent portion to be used.

[0034] Take 100g of hydroxyl acrylic resin, add 15g of butyl acetate and 15g of xylene, and disperse evenly to obtain the coating part to be used.

[0035] Take 44g of the curing agent and 91g of the coating, mix them well, apply the mixture to a tinplate, and place it in a constant temperature and humidity room (temperature 23±2℃, relative humidity 50±5%) to dry. The measured technical indicators are shown in Table 1.

[0036] Example 2: 500g of 1,4-cyclohexane diisocyanate monomer was added to a flask and stirred and heated to 70°C under nitrogen protection. After the temperature stabilized, 2g of tetraethylammonium hydroxide catalyst dispersion with isooctanol as solvent and a concentration of 0.5wt% was added and the mixture was stirred to react. When the conversion rate reached 40%, 0.2g of diisooctyl phosphate was added to terminate the reaction and obtain a reaction solution. The reaction solution was then distilled using a short-path evaporator at 170°C and 20Pa to obtain a polyisocyanate composition with a 1,4-cyclohexane diisocyanate monomer content of less than 0.2wt%, namely, 1,4-cyclohexane diisocyanate trimer.

[0037] Take 100g of 1,4-cyclohexane diisocyanate trimer and add 100g of butyl acetate to disperse evenly to obtain the curing agent portion to be used.

[0038] Take 100g of hydroxyl acrylic resin and add 30g of butyl acetate to disperse evenly to obtain the coating part to be used.

[0039] Take 44g of the curing agent and 91g of the coating, mix them well, apply the mixture to a tinplate, and place it in a constant temperature and humidity room (temperature 23±2℃, relative humidity 50±5%) to dry. The measured technical indicators are shown in Table 1.

[0040] Example 3: 500g of 1,4-cyclohexane diisocyanate monomer was added to a flask and stirred and heated to 70°C under nitrogen protection. After the temperature stabilized, 2g of a 0.5wt% 2-hydroxy-N,N,N-trimethyl-1-propylcarbamate catalyst dispersion in isooctanol solvent was added and the mixture was stirred to react. When the conversion rate reached 40%, 0.197g of diisooctyl phosphate was added to terminate the reaction and obtain a reaction solution. The reaction solution was then distilled using a short-path evaporator at 160°C and 10Pa to obtain a polyisocyanate composition with a 1,4-cyclohexane diisocyanate monomer content of less than 0.2wt%, namely, 1,4-cyclohexane diisocyanate trimer.

[0041] Take 100g of 1,4-cyclohexane diisocyanate trimer, add 50g of butyl acetate and 50g of xylene, and disperse evenly to obtain the curing agent portion to be used.

[0042] Take 100g of alkyd resin and add 40g of butyl acetate powder to obtain the coating portion to be used.

[0043] Take 61g of curing agent and 91g of coating, stir them evenly, apply them to tinplate, and place them in a constant temperature and humidity room (temperature 23±2℃, relative humidity 50±5%) to dry. The measured technical indicators are shown in Table 1.

[0044] Example 4: 500g of 1,2-cyclohexane diisocyanate monomer was added to a flask and stirred and heated to 70°C under nitrogen protection. After the temperature stabilized, 2g of a 0.5wt% 2-hydroxy-N,N,N-trimethyl-1-propylcarbamate catalyst dispersion in isooctanol solvent was added and the mixture was stirred until the conversion rate reached 40%. The reaction was terminated by adding 0.197g of diisooctyl phosphate to obtain a reaction solution. The reaction solution was then distilled using a short-path evaporator at 160°C and 10Pa to obtain a polyisocyanate composition with a 1,2-cyclohexane diisocyanate monomer content of less than 0.2wt%, namely, 1,2-cyclohexane diisocyanate trimer.

[0045] Take 100g of 1,2-cyclohexane diisocyanate trimer, add 50g of butyl acetate and 50g of xylene, and disperse evenly to obtain the curing agent portion to be used.

[0046] Take 100g of hydroxyl acrylic resin, add 15g of butyl acetate and 15g of xylene, and disperse evenly to obtain the coating part to be used.

[0047] Take 44g of the curing agent and 91g of the coating, mix them well, apply the mixture to a tinplate, and place it in a constant temperature and humidity room (temperature 23±2℃, relative humidity 50±5%) to dry. The measured technical indicators are shown in Table 1.

[0048] Example 5: 500g of 1,3-cyclohexane diisocyanate monomer was added to a flask and stirred and heated to 70°C under nitrogen protection. After the temperature stabilized, 2g of a 0.5wt% 2-hydroxy-N,N,N-trimethyl-1-propylcarbamate catalyst dispersion in isooctanol solvent was added and the mixture was stirred until the conversion rate reached 40%. The reaction was terminated by adding 0.197g of diisooctyl phosphate to obtain a reaction solution. The reaction solution was then distilled using a short-path evaporator at 160°C and 10Pa to obtain a polyisocyanate composition with a 1,3-cyclohexane diisocyanate monomer content of less than 0.2wt%, namely, 1,3-cyclohexane diisocyanate trimer.

[0049] Take 100g of 1,3-cyclohexane diisocyanate trimer, add 50g of butyl acetate and 50g of xylene, and disperse evenly to obtain the curing agent portion to be used.

[0050] Take 100g of polyurethane resin, add 15g of butyl acetate and 15g of xylene, and disperse evenly to obtain the coating portion to be used.

[0051] Take 44g of curing agent and 103g of coating, stir them evenly, apply them to the tinplate, and place them in a constant temperature and humidity room (temperature 23±2℃, relative humidity 50±5%) to dry. The measured technical indicators are shown in Table 1.

[0052] Comparative Example 1: 500g of hexamethylene diisocyanate (HDI) monomer was added to a flask and stirred and heated to 70°C under nitrogen protection. After the temperature stabilized, 2g of a 0.5wt% 2-hydroxy-N,N,N-trimethyl-1-propylcarbamate catalyst dispersion in isooctanol was added and the mixture was stirred until the conversion rate reached 40%. The reaction was terminated by adding 0.197g of diisooctyl phosphate to obtain a reaction solution. The reaction solution was then distilled using a short-path evaporator at 160°C and 10Pa to obtain a polyisocyanate composition with an HDI monomer content of less than 0.2wt%, i.e., HDI trimer.

[0053] Take 100g of HDI trimer, add 50g of butyl acetate and 50g of xylene, and disperse evenly to obtain the curing agent portion to be used.

[0054] Take 100g of hydroxyl acrylic resin, add 15g of butyl acetate and 15g of xylene, and disperse evenly to obtain the coating part to be used.

[0055] Take 44g of the curing agent and 91g of the coating, mix them well, apply the mixture to a tinplate, and place it in a constant temperature and humidity room (temperature 23±2℃, relative humidity 50±5%) to dry. The measured technical indicators are shown in Table 1.

[0056] Comparative Example 2: 500g of isophorone diisocyanate (IPDI) monomer was added to a flask and stirred and heated to 70°C under nitrogen protection. After the temperature stabilized, 2g of a 0.5wt% 2-hydroxy-N,N,N-trimethyl-1-propylcarbamate catalyst dispersion in isooctanol was added and the mixture was stirred until the conversion rate reached 40%. The reaction was terminated by adding 0.197g of diisooctyl phosphate to obtain a reaction solution. The reaction solution was then distilled using a short-path evaporator at 160°C and 10Pa to obtain a polyisocyanate composition with an IPDI monomer content of less than 0.2wt%, i.e., IPDI trimer.

[0057] Take 100g of IPDI trimer, add 50g of butyl acetate and 50g of xylene, and disperse evenly to obtain the curing agent portion to be used.

[0058] Take 100g of hydroxyl acrylic resin, add 15g of butyl acetate and 15g of xylene, and disperse evenly to obtain the coating part to be used.

[0059] Take 53g of curing agent and 91g of coating, stir them evenly, apply them to tinplate, and place them in a constant temperature and humidity room (temperature 23±2℃, relative humidity 50±5%) to dry. The measured technical indicators are shown in Table 1.

[0060] Comparative Example 3: 500g of HDI monomer was added to a flask and stirred and heated to 70℃ under nitrogen protection. After the temperature stabilized, 2g of a 0.5wt% 2-hydroxy-N,N,N-trimethyl-1-propylcarbamate catalyst dispersion was added and stirred to react. When the conversion rate reached 40%, 0.197g of diisooctyl phosphate was added to terminate the reaction and obtain a reaction solution. Then, the reaction solution was distilled using a short-path evaporator at 160℃ and 10Pa to obtain a polyisocyanate composition with an HDI monomer content of less than 0.2wt%, i.e., HDI trimer.

[0061] Take 100g of HDI trimer, add 50g of butyl acetate and 50g of xylene, and disperse evenly to obtain the curing agent portion to be used.

[0062] Take 100g of alkyd resin and add 40g of butyl acetate powder to obtain the coating portion to be used.

[0063] Take 61g of curing agent and 91g of coating, stir them evenly, apply them to tinplate, and place them in a constant temperature and humidity room (temperature 23±2℃, relative humidity 50±5%) to dry. The measured technical indicators are shown in Table 1.

[0064] Comparative Example 4: 500g of IPDI monomer was added to a flask and stirred and heated to 70°C under nitrogen protection. After the temperature stabilized, 2g of a 0.5wt% 2-hydroxy-N,N,N-trimethyl-1-propylcarbamate catalyst dispersion in isooctanol was added and the mixture was stirred until the conversion rate reached 40%. The reaction was terminated by adding 0.197g of diisooctyl phosphate to obtain a reaction solution. The reaction solution was then distilled using a short-path evaporator at 160°C and 10Pa to obtain a polyisocyanate composition with an IPDI monomer content of less than 0.2wt%, i.e., IPDI trimer.

[0065] Take 100g of IPDI trimer, add 50g of butyl acetate and 50g of xylene, and disperse evenly to obtain the curing agent portion to be used; Take 100g of alkyd resin and add 40g of butyl acetate powder to obtain the coating portion to be used.

[0066] Take 73g of curing agent and 91g of coating, stir them evenly, apply them to tinplate, and place them in a constant temperature and humidity room (temperature 23±2℃, relative humidity 50±5%) to dry. The measured technical indicators are shown in Table 1.

[0067] Table 1 Drying time test: Surface drying and actual drying time tests were conducted according to the national standard GB / T 1728-2020.

[0068] Pencil hardness test: After the paint film is scraped, the pencil hardness test is carried out in accordance with GB / T 6739-2022.

[0069] Compared with Comparative Examples 1 and 2, the coatings prepared using 1,4-cyclohexane diisocyanate trimer and hydroxyl acrylic resin in Examples 1 and 2 have faster surface drying time, faster hardness, and higher hardness than the coatings prepared using HDI trimer and IPDI trimer and hydroxyl acrylic resin.

[0070] Compared with Comparative Examples 3 and 4, the coating prepared using 1,4-cyclohexane diisocyanate trimer and alkyd resin in Example 3 had a faster surface drying time, a faster hard drying time, and higher hardness than the coatings prepared using HDI trimer and IPDI trimer and alkyd resin.

[0071] Furthermore, it should be understood that after reading the above description of the present invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A fast-drying, high-hardness coating composition based on cyclohexane diisocyanate trimer, comprising a coating portion and a curing agent portion, characterized in that, The curing agent includes a cyclohexane diisocyanate trimer.

2. The fast-drying, high-hardness coating composition based on cyclohexane diisocyanate trimer according to claim 1, characterized in that, The cyclohexane diisocyanate trimer includes at least one of 1,2-cyclohexane diisocyanate trimer, 1,3-cyclohexane diisocyanate trimer, and 1,4-cyclohexane diisocyanate trimer; The mass ratio of the coating portion to the curing agent portion is 1.2 to 10:

1.

3. The fast-drying, high-hardness coating composition based on cyclohexane diisocyanate trimer according to claim 1, characterized in that, The coating component includes a resin and a first organic solvent; In the coating portion, the mass ratio of the resin to the first organic solvent is 60~100:10~90.

4. The fast-drying, high-hardness coating composition based on cyclohexane diisocyanate trimer according to claim 3, characterized in that, The resin contains active hydrogen and includes at least one of hydroxyl acrylic resin, alkyd resin, epoxy resin, polyurethane resin, and phenolic resin. The first organic solvent includes at least one of butyl acetate and xylene.

5. The fast-drying, high-hardness coating composition based on cyclohexane diisocyanate trimer according to claim 1, characterized in that, The curing agent portion also includes a second organic solvent; In the curing agent portion, the mass ratio of cyclohexane diisocyanate trimer to the second organic solvent is 50~70:30~80.

6. The fast-drying, high-hardness coating composition based on cyclohexane diisocyanate trimer according to claim 5, characterized in that, The second organic solvent includes at least one of butyl acetate and xylene.

7. Cyclohexane diisocyanate trimer is used as a curing agent to shorten coating drying time and improve coating hardness.

8. The application according to claim 7, characterized in that, The cyclohexane diisocyanate trimer includes at least one of 1,2-cyclohexane diisocyanate trimer, 1,3-cyclohexane diisocyanate trimer, and 1,4-cyclohexane diisocyanate trimer; Add cyclohexane diisocyanate trimer at a concentration of 4% to 30% of the total mass of the coating composition.

9. A method for promoting rapid drying and high hardness of coatings, characterized in that, include: Cyclohexane diisocyanate trimer was added to the coating as a curing agent.

10. The method for promoting rapid drying and high hardness of coatings according to claim 9, characterized in that, The cyclohexane diisocyanate trimer includes at least one of 1,2-cyclohexane diisocyanate trimer, 1,3-cyclohexane diisocyanate trimer, and 1,4-cyclohexane diisocyanate trimer; Add cyclohexane diisocyanate trimer at a concentration of 4% to 30% of the total mass of the coating composition.

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