Quick-drying polyisocyanate composition as well as preparation method and application thereof

Abstract

The invention discloses a quick-drying polyisocyanate composition as well as a preparation method and application thereof. The composition is an adduct obtained by reacting trimethylol alkane with excessive hydrogenated xylylene diisocyanate and then removing free monomers, and comprises a high-functionality adduct component and a low-functionality adduct component, the ratio S1 / S2 of the high-functionality adduct component to the low-functionality adduct component is 0.3 to 1.5, preferably 0.36 to 1.43. The polyisocyanate composition provided by the invention not only has relatively short surface drying time, but also has relatively short hard drying time, so that the weather-resistant coating can be really dried within a short time.

Description

Technical Field

[0001] The invention relates to a polyisocyanate composition, in particular to a quick-drying polyisocyanate composition and a preparation method and application thereof. Background Art

[0002] Two-component polyurethane coatings are the type of polyurethane coatings with the most varieties, the largest output, and the widest application. As downstream applications become more and more abundant, new requirements are also put forward for traditional aromatic polyisocyanate curing agents. TMP-type adducts prepared using hydrogenated xylene diisocyanate (H6XDI) are more weather-resistant and have outstanding color retention than aromatic isocyanates. They have important applications in high-end fields such as outdoor products and consumer electronics. However, as more and more companies begin to enter the field of high-end coatings, downstream customers in this field are paying more and more attention to the production cost of products. During the coating construction process, sufficient time is required to wait for it to dry and solidify. Therefore, if the drying time of such weather-resistant coatings can be further shortened, it means that downstream customers can be given higher production efficiency and save production costs.

[0003] Patent CN104395417B discloses a method for preparing a polyurethane curing agent based on H6XDI, which has good drying properties. However, actual tests have found that the excellent drying properties of this product are only reflected in the short "surface drying time", while the "actual drying time" in the actual construction process is much longer than the "surface drying time". Therefore, a method is urgently needed to further shorten the "actual drying time". Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes a quick-drying polyisocyanate composition and a preparation method and application thereof. The polyisocyanate composition proposed by the present invention not only has a shorter surface drying time, but also a shorter actual drying time, which can truly achieve the drying of weather-resistant coatings in a short time.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A quick-drying polyisocyanate composition, which is an adduct obtained by reacting trimethylolalkane with excess hydrogenated xylylene diisocyanate and removing free monomers, comprising a high-functionality adduct component and a low-functionality adduct component; the ratio S1 / S2 of the high-functionality adduct component to the low-functionality adduct component is 0.3-1.5, preferably 0.36-1.43;

[0007] Wherein, S1 is the sum of the signal peak areas of the polyisocyanate composition in the GPC spectrum at the peak positions at retention time 20.1-20.9min and retention time 21.1-22.1min, and S2 is the signal peak area of ​​the polyisocyanate composition in the GPC spectrum at the peak position at retention time 22.5-23.6min. The above-mentioned signal peak in the present invention particularly refers to a single peak signal peak.

[0008] The trimethylolalkane is one or more of trimethylolpropane, trimethylolcyclohexane, trimethylolbutane and trimethylolpentane.

[0009] For the TMP-type adduct with trimethylolpropane as the raw material, it can be clearly known that the low-functionality adduct component refers to the addition product of 1 molecule of trimethylolpropane and 3 molecules of hydrogenated xylene diisocyanate (shown in Formula I), and based on the professional knowledge of the technicians, it can be reasonably inferred that the high-functionality adduct component represents the addition product of 2 molecules of trimethylolpropane and 5 molecules of hydrogenated xylene diisocyanate (shown in Formula II) and the addition product of 3 molecules of trimethylolpropane and 7 molecules of hydrogenated xylene diisocyanate (shown in Formula III).

[0010]

[0011] The inventors have found through continuous research that the ratio S1 / S2 of the high-functionality adduct component to the low-functionality adduct component has a crucial influence on the drying time of the applied product. When S1 / S2 falls within the range of 0.3-1.5, the paint film has good quick-drying performance, which is manifested in that both the surface drying time and the actual drying time are relatively short. When the ratio is less than 0.3, the improvement of the actual drying speed of the product is not obvious; when the ratio is greater than 1.5, the surface drying speed of the product is significantly slowed down. Therefore, in order to solve the technical problem in the present invention, the optimal range of the ratio S1 / S2 of the high-functionality adduct component to the low-functionality adduct component is 0.3-1.5.

[0012] As a preferred embodiment of the present invention, the usage ratio of the hydrogenated xylylene diisocyanate and the trimethylolalkane, calculated as the molar ratio R of isocyanate group to hydroxyl group, is 4.4≤R≤6.5.

[0013] As a preferred embodiment of the present invention, the reaction conditions are: reaction temperature 55-100°C, preferably 60-95°C, reaction time 3-12h, preferably 4-10h.

[0014] As a preferred embodiment of the present invention, the conditions for removing free monomers are: separation temperature 140-190° C., preferably 140-185° C.; separation pressure 0.1-100 Pa, preferably 20-100 Pa.

[0015] As a preferred embodiment of the present invention, the residual free monomer content in the composition is 0.05-0.5%, preferably 0.15-0.5%.

[0016] As a preferred embodiment of the present invention, the adduct obtained by the reaction is diluted to a solid content of 70-85% and stored and used as a quick-drying polyisocyanate composition.

[0017] As a preferred embodiment of the present invention, the solvent used for dilution is one or more of toluene, xylene, acetone, methyl butyl ketone, methyl isobutyl ketone, cyclohexanone, toluene cyclohexanone, cyclohexane, n-hexane, tetrahydrofuran, chlorobenzene, dichlorobenzene, dichloromethane, dichloroethane, 1,3-dioxane, methyl acetate, ethyl acetate, butyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, ethyl propionate, propyl propionate, and butyl propionate.

[0018] A method for preparing a quick-drying polyisocyanate composition as described above is characterized in that hydrogenated xylylene diisocyanate and an excess of trimethylolalkane are first reacted, and then the remaining hydrogenated xylylene diisocyanate and trimethylolalkane are added in no particular order and no particular number of times to react to obtain the polyisocyanate composition.

[0019] In order to obtain a polyisocyanate composition in which S1 / S2 falls within the above range, it can be achieved by increasing the proportion of high-functionality adduct components in the system, and the key to increasing the proportion of high-functionality adduct components is to increase the content of hydroxyl components. However, for TMP-type adduct products, it is known to control the excess of NCO components to allow the hydroxyl components to react completely, avoid the presence of active hydroxyl functional groups in the system, and finally remove the excess NCO components by processes such as evaporation. Therefore, the present invention adopts the method of adding trimethylolalkane in steps and adding it in excess in the first step of adding to increase the content of high-functionality adduct components, and to increase the proportion of high-functionality adduct components to a certain extent in the initial reaction stage, so that the ratio of S1 / S2 is easier to adjust within the range of 0.3-1.5.

[0020] As a preferred embodiment of the present invention, hydrogenated xylylene diisocyanate and excess trimethylolalkane are based on a molar ratio of isocyanate group to hydroxyl group, R0, of 0.023≤R0≤0.475;

[0021] Preferably, the hydrogenated xylylene diisocyanate and the excess trimethylolalkane are first reacted for 1.0-4.0 h, preferably 1.2-3.5 h, and then the remaining hydrogenated xylylene diisocyanate and trimethylolalkane are added.

[0022] Preferably, the content of the trimethylolalkane added for the first time is 9-35% of the total mass.

[0023] As a method for preparing the polyisocyanate composition of the present invention, for example, but not limited to, the following scheme:

[0024] As in scheme 1, trimethylolalkane is added in two batches. First, an excess of trimethylolalkane is reacted with hydrogenated xylene diisocyanate to generate a terminal hydroxyl derivative. Then, trimethylolalkane and an excess of hydrogenated xylene diisocyanate are added thereto. The reaction is complete to obtain a terminal NCO adduct reaction solution.

[0025] As in Scheme 2, trimethylolalkane is added in two batches. First, an excess of trimethylolalkane is reacted with hydrogenated xylene diisocyanate to form a terminal hydroxyl derivative. Then, an excess of hydrogenated xylene diisocyanate is added thereto. Finally, the remaining trimethylolalkane is added. The reaction is completed to obtain a terminal NCO adduct reaction solution.

[0026] As in scheme three, trimethylolalkane is added in three batches. First, an excess of trimethylolalkane is reacted with hydrogenated xylene diisocyanate to form a terminal hydroxyl derivative. Then, the second batch of trimethylolalkane is added thereto, and an excess of hydrogenated xylene diisocyanate is added at the same time. After a period of reaction, the third batch of trimethylolalkane is finally added. The reaction is complete to obtain a terminal NCO adduct reaction solution.

[0027] The above preparation method is only one of the exemplary means for controlling S1 / S2 to meet the above requirements, and is not intended to be any limitation on the polyisocyanate composition of the present invention. In addition, those skilled in the art may also adjust S1 / S2 within the scope of the present invention by other possible means, such as appropriately increasing the reaction temperature.

[0028] As a further supplementary explanation of the preparation method of the present invention, after the reaction is completed, the free NCO monomer remaining in the system is removed by, for example, thin film evaporation to control the content of the free monomer within the specification requirements, and finally the product is diluted to 70-85% solid content at 50-85° C. to obtain the polyisocyanate composition.

[0029] Preferably, the free monomer separation conditions are: separation temperature is 140-190° C., preferably 140-185° C.; separation pressure is 0.1-100 Pa, preferably 20-100 Pa.

[0030] A use of the quick-drying polyisocyanate composition as described above or the quick-drying polyisocyanate composition prepared by the method described above as a coating curing agent.

[0031] The polyisocyanate composition provided by the present invention has both short surface drying time and quick drying time, and is suitable for preparing quick-drying coating products. DETAILED DESCRIPTION

[0032] The present invention is further described below by means of specific examples. The examples described in the present invention are only used to illustrate the present invention and do not limit the scope of the present invention.

[0033] The following examples will further illustrate the method provided by the present invention, but the present invention is not limited to the listed examples, and should also include any other known changes within the scope of the claims of the present invention. The specific application of the present invention is not limited to the applications mentioned in the examples. People familiar with the art can make expansive changes to the present invention through the concept of the present invention, and these simple changes are within the scope of protection of the present invention.

[0034] The following test method is used in the embodiment of the present invention:

[0035] (1) Test method for free isocyanate monomer content: using the national standard GB / T18446-2009, tested by Agilent GC-7890B gas chromatograph;

[0036] (2) GPC test: The test was conducted using the Gel Permeation Chromatography Alliance test method and the component ratios were calculated.

[0037] Gel permeation chromatography test method: Weigh about 0.05g of sample, dissolve it in dichloromethane to make 1.5ml solution, and then measure it under the following conditions:

[0038] Gel chromatography type / model: Agilent1260;

[0039] Mobile phase: tetrahydrofuran;

[0040] Chromatographic columns: Pl1113-6520 and Pl113-6325 (Agilent);

[0041] Chromatographic column packing: phenyl methyl polysiloxane;

[0042] Detection method: differential detector;

[0043] Flow rate 1 ml / min, pressure 93.3-98.0 bar, column temperature 35°C.

[0044] Component ratio calculation method:

[0045] The sum of the signal peak areas at the retention times of 20.1-20.9 min and 21.1-22.1 min in the GPC spectrum was counted as S1; the peak area at the retention time of 22.5-23.6 min was counted as S2. S1 / S2 is the ratio of the high-functionality adduct component to the low-functionality adduct component.

[0046] (3) Product impact resistance test: The polyisocyanate composition was prepared according to the coating preparation method, and the national standard GB / T 1732-93 was adopted to test the product using Riven's QCJ-100 paint film impact tester;

[0047] Coating preparation method: The prepared polyisocyanate composition is mixed with a polyol (ACR7502, Tongde Chemical) in a ratio of 1.0 of an equivalent ratio (NCO / OH) of isocyanate groups in the polyisocyanate composition to hydroxyl groups in the polyol, and then adjusted with a mixed solvent (component composition: ethyl acetate / butyl acetate = 1 / 1 / (mass ratio)) to a mixed liquid with a solid content of 50%.

[0048] (4) Product drying performance test: The polyisocyanate composition was prepared according to the above coating preparation method, and the surface drying time and actual drying time of the coating were tested.

[0049] Surface drying time test: Use a 100μm applicator to apply the mixed solution on a glass plate (JIS R3202) test piece. When you touch the center of the coated surface, the fingertips are not contaminated by the sample (refer to JIS K 5600-1-1). Record the time elapsed at this time as an indicator of the evaluation result.

[0050] Drying time test: Apply the mixed solution to a glass plate (JIS R3202) test piece using a 100μm applicator. Try to pinch the center of the test piece with your thumb and index finger until there is no depression caused by fingerprints on the glass coating and no movement of the coating film is felt. In addition, try to rub the coating surface quickly and repeatedly with your fingertips until no friction marks are produced (refer to JIS K 5600-1-1). Record the time elapsed at this time as an indicator of the evaluation result.

[0051] In the following examples, the main raw materials used are as follows:

[0052] Hydrogenated xylylene diisocyanate (H6XDI): Wanhua Chemical, purity >99%;

[0053] Trimethylolpropane: Pasto, purity>99%;

[0054] Polyol: ACR7502, Tongde Chemical, purity >99%;

[0055] Ethyl acetate: Aladdin reagent, purity>99%;

[0056] Butyl acetate: Aladdin reagent, purity>99%;

[0057] Unless otherwise specified, other raw materials and reagents can be obtained from commercial sources.

[0058] The reaction, separation and dilution processes of the following examples and comparative examples were all carried out in an environment with sufficient dry nitrogen.

[0059] [Example 1]

[0060] Weigh 5.97g of hydrogenated xylene diisocyanate and 10.21g of trimethylolpropane, add them to a round-bottom flask, heat in a water bath at 65°C for 1.2h, keep stirring during the period, and obtain a terminal hydroxyl derivative. Then add 494.03g of hydrogenated xylene diisocyanate and 33.24g of trimethylolpropane to the container, and then continue to react at 60°C for 2.5h, keep stirring during the period, and obtain a terminal NCO adduct reaction liquid. Separate the unreacted free isocyanate monomer by a thin film evaporator (separation temperature 160°C, separation pressure 30Pa), collect the heavy components and mix with ethyl acetate to dilute to a solid content of 75%. After stirring and mixing evenly, a polyisocyanate composition is obtained.

[0061] [Example 2]

[0062] Weigh 18.10g of hydrogenated xylene diisocyanate and 17.53g of trimethylolpropane, add them to a round-bottom flask, heat in a water bath at 65°C for 4.0h, keep stirring during the period, and obtain a terminal hydroxyl derivative. Then add 481.90g of hydrogenated xylene diisocyanate and 34.81g of trimethylolpropane to the container, and then continue to react at 70°C for 3.5h, keep stirring during the period, and obtain a terminal NCO adduct reaction liquid. Separate the unreacted free isocyanate monomer by a thin film evaporator (separation temperature 140°C, separation pressure 20Pa), collect the heavy components and mix with ethyl acetate to dilute to a solid content of 75%. After stirring and mixing evenly, a polyisocyanate composition is obtained.

[0063] [Example 3]

[0064] Weigh 7.31g of hydrogenated xylene diisocyanate and 10.69g of trimethylolpropane, add them to a round-bottom flask, heat in a water bath at 70°C for 2.5h, keep stirring during the period, and obtain a terminal hydroxyl derivative. Then add 492.69g of hydrogenated xylene diisocyanate and 32.76g of trimethylolpropane to the container, and then continue to react at 80°C for 4.0h, keep stirring during the period, and obtain a terminal NCO adduct reaction liquid. Separate the unreacted free isocyanate monomer by a thin film evaporator (separation temperature 180°C, separation pressure 80Pa), collect the heavy components and mix with ethyl acetate to dilute to a solid content of 75%. After stirring and mixing evenly, a polyisocyanate composition is obtained.

[0065] [Example 4]

[0066] Weigh 0.16g of hydrogenated xylene diisocyanate and 3.26g of trimethylolpropane, add them to a round-bottom flask, heat in a water bath at 55°C for 3.0h, keep stirring during the period, and obtain a terminal hydroxyl derivative. Then add 499.84g of hydrogenated xylene diisocyanate and 32.17g of trimethylolpropane to the container, and then continue to react at 70°C for 5.0h, keep stirring during the period, and obtain a terminal NCO adduct reaction liquid. Separate the unreacted free isocyanate monomer by a thin film evaporator (separation temperature 150°C, separation pressure 50Pa), collect the heavy components and mix with ethyl acetate to dilute to a solid content of 75%. After stirring and mixing evenly, a polyisocyanate composition is obtained.

[0067] [Example 5]

[0068] Weigh 11.71g of hydrogenated xylene diisocyanate and 15.13g of trimethylolpropane, add them to a round-bottom flask, heat in a water bath at 80°C for 3.5h, keep stirring during the process, and obtain a terminal hydroxyl derivative. Then add 488.29g of hydrogenated xylene diisocyanate to the container and react at 95°C for 2.0h, and finally add 31.87g of trimethylolpropane, and then continue to react at 95°C for 2.0h, keep stirring during the process, and obtain a terminal NCO adduct reaction liquid. Separate the unreacted free isocyanate monomer by a thin film evaporator (separation temperature 160°C, separation pressure 40Pa), collect the heavy components and mix with ethyl acetate to dilute to a solid content of 75%. After stirring and mixing evenly, a polyisocyanate composition is obtained.

[0069] [Example 6]

[0070] Weigh 1.08g of hydrogenated xylene diisocyanate and 5.17g of trimethylolpropane, add them to a round-bottom flask, heat in a water bath at 60°C for 2.0h, keep stirring during the process, and obtain a terminal hydroxyl derivative. Then add 498.92g of hydrogenated xylene diisocyanate and 25.23g of trimethylolpropane to the container, continue to react at 65°C for 7.0h, and finally add 10.0g of trimethylolpropane, continue to react at 65°C for 7.0h, keep stirring during the process, and obtain a terminal NCO adduct reaction liquid. Separate the unreacted free isocyanate monomer by a thin film evaporator (separation temperature 190°C, separation pressure 100Pa), collect the heavy components and mix with ethyl acetate to dilute to a solid content of 75%. After stirring and mixing evenly, a polyisocyanate composition is obtained.

[0071] [Example 7]

[0072] Weigh 3.02g of hydrogenated xylene diisocyanate and 8.08g of trimethylolpropane, add them to a round-bottom flask, heat in a water bath at 90°C for 1.0h, keep stirring during the period, and obtain a terminal hydroxyl derivative. Then add 496.98g of hydrogenated xylene diisocyanate and 35.37g of trimethylolpropane to the container, and then continue to react at 60°C for 6.0h, keep stirring during the period, and obtain a terminal NCO adduct reaction liquid. Separate the unreacted free isocyanate monomer by a thin film evaporator (separation temperature 170°C, separation pressure 60Pa), collect the heavy components and mix with ethyl acetate to dilute to a solid content of 75%. After stirring and mixing evenly, a polyisocyanate composition is obtained.

[0073] [Comparative Example 1]

[0074] Weigh 500g of hydrogenated xylylene diisocyanate into a round-bottom flask, add 43.45g of trimethylolpropane, heat in a water bath at 65°C for 1.2h, keep stirring during the process, and then continue to react at 70°C for 2.5h, keep stirring during the process, to obtain a terminal NCO adduct reaction liquid. Separate the unreacted free isocyanate monomer by a thin film evaporator (separation temperature 170°C, separation pressure 30Pa), collect the heavy components, mix with ethyl acetate and dilute to a solid content of 75%. After stirring and mixing evenly, a polyisocyanate composition is obtained.

[0075] [Comparative Example 2]

[0076] Weigh 5.97g of hydrogenated xylene diisocyanate and 0.91g of trimethylolpropane, add them to a round-bottom flask, heat in a water bath at 65°C for 1.2h, keep stirring during the process, and obtain a terminal hydroxyl derivative. Then add 494.03g of hydrogenated xylene diisocyanate and 42.54g of trimethylolpropane to the container, and then continue to react at 60°C for 2.5h, keep stirring during the process, and obtain a terminal NCO derivative reaction liquid. The unreacted isocyanate monomer in the reaction liquid is separated by a thin film evaporator (separation temperature 160°C, separation pressure 30Pa), and the heavy components are collected and mixed with ethyl acetate to dilute to a solid content of 75%. After stirring and mixing evenly, a polyisocyanate composition is obtained.

[0077] [Comparative Example 3]

[0078] Weigh 5.97g of hydrogenated xylene diisocyanate and 42.21g of trimethylolpropane, add them to a round-bottom flask, heat in a water bath at 65°C for 1.2h, keep stirring during the process, and obtain a terminal hydroxyl derivative. Then add 494.03g of hydrogenated xylene diisocyanate and 1.24g of trimethylolpropane to the container, and then continue to react at 60°C for 2.5h, keep stirring during the process, and obtain a terminal NCO derivative reaction liquid. The unreacted isocyanate monomer in the reaction liquid is separated by a thin film evaporator (separation temperature 160°C, separation pressure 30Pa), and the heavy components are collected and mixed with ethyl acetate to dilute to a solid content of 75%. After stirring and mixing evenly, a polyisocyanate composition is obtained.

[0079] Table 1 Basic indicators and performance test results of embodiments and comparative examples

[0080]

[0081] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this field can make several improvements and supplements without departing from the method of the present invention. These improvements and supplements should also be regarded as the scope of protection of the present invention.

Claims

1. A quick-drying polyisocyanate composition, characterized in that: The adduct is obtained by removing free monomers after the reaction of trimethylolalkane and hydrogenated xylylene diisocyanate, which includes a high-functionality adduct component and a low-functionality adduct component; the ratio S1 / S2 of the high-functionality adduct component and the low-functionality adduct component is 0.3-1.5, preferably 0.36-1.43; Among them, S1 is the sum of the peak areas of the signals of the polyisocyanate composition at the peak positions in the GPC spectrum at retention times of 20.1-20.9 min and 21.1-22.1 min, and S2 is the peak area of ​​the signals of the polyisocyanate composition at the peak positions in the GPC spectrum at retention times of 22.5-23.6 min.

2. The quick-drying polyisocyanate composition according to claim 1, characterized in that: The usage ratio of the hydrogenated xylylene diisocyanate and the trimethylolalkane, calculated as the molar ratio R of isocyanate group to hydroxyl group, is 4.4≤R≤6.

5.

3. The quick-drying polyisocyanate composition according to claim 2, characterized in that: The reaction conditions are: reaction temperature 55-100°C, preferably 60-95°C, reaction time 3-12h, preferably 4-10h.

4. The quick-drying polyisocyanate composition according to any one of claims 1 to 3, characterized in that: The conditions for removing free monomers are: separation temperature 140-190°C, preferably 140-185°C; separation pressure 0.1-100Pa, preferably 20-100Pa.

5. The quick-drying polyisocyanate composition according to claim 4, characterized in that: In the composition, the residual free monomer content is 0.05-0.5%, preferably 0.15-0.5%.

6. The quick-drying polyisocyanate composition according to claim 4, characterized in that: The adduct obtained by the reaction is diluted to a solid content of 70-85% and stored for use as a quick-drying polyisocyanate composition.

7. The quick-drying polyisocyanate composition according to claim 4, characterized in that: The solvent used for dilution is one or more of toluene, xylene, acetone, methyl butyl ketone, methyl isobutyl ketone, cyclohexanone, toluene cyclohexanone, cyclohexane, n-hexane, tetrahydrofuran, chlorobenzene, dichlorobenzene, dichloromethane, dichloroethane, 1,3-dioxane, methyl acetate, ethyl acetate, butyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, ethyl propionate, propyl propionate and butyl propionate.

8. A method for preparing a quick-drying polyisocyanate composition according to any one of claims 1 to 7, characterized in that: Firstly, hydrogenated xylylene diisocyanate and an excess of trimethylolalkane are reacted, and then the remaining hydrogenated xylylene diisocyanate and trimethylolalkane are added in any order and in any number of times to react and obtain the polyisocyanate composition.

9. The method for preparing the quick-drying polyisocyanate composition according to claim 8, characterized in that: The hydrogenated xylylene diisocyanate and the excess trimethylolalkane are based on the molar ratio of isocyanate group to hydroxyl group as R0, 0.023≤R0≤0.475; Preferably, the hydrogenated xylylene diisocyanate and the excess trimethylolalkane are first reacted for 1.0-4.0 h, preferably 1.2-3.5 h, and then the remaining hydrogenated xylylene diisocyanate and trimethylolalkane are added.

10. Use of the quick-drying polyisocyanate composition according to any one of claims 1 to 7 or the quick-drying polyisocyanate composition prepared by the method according to any one of claims 8 to 9 as a coating curing agent.

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