Polyurethane varnish with super-long activation period and application thereof

Abstract

The invention provides a polyurethane varnish with an ultra-long activation period and application thereof, and belongs to the technical field of coatings. A main agent of the polyurethane varnish with the ultra-long activation period comprises AQUAPAC 8287 water-based resin and AQUAPAC 8233 resin, and a curing agent of the polyurethane varnish with the ultra-long activation period comprises an HT100 curing agent. According to the invention, the AQUAPAC 8287 resin and the AQUAPAC 8233 resin are adopted, the slow-drying solvent exists in the AQUAPAC 8287 resin and the AQUAPAC 8233 resin, and the curing agent HT100 is matched, so that the subsequent curing reaction time is prolonged, and the activation period of the polyurethane varnish is further prolonged. Data of the embodiment shows that the activation period of the polyurethane varnish at the temperature of 25 DEG C reaches 28 hours.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, in particular to a polyurethane varnish with an ultra-long activation period and application thereof. Background Art

[0002] Currently, many topcoats use polyurethane systems for high gloss and good weather resistance. The activation period of polyurethane topcoats is generally 2 to 3 hours. Sometimes, after the paint is prepared, it cannot be applied due to various special reasons, and it cannot be used after the activation period has expired. Summary of the invention

[0003] In view of this, the object of the present invention is to provide a polyurethane varnish with an ultra-long activation period and its application. The polyurethane varnish of the present invention has a long activation period.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] The invention provides a polyurethane varnish with an ultra-long activation period, comprising a main agent and a curing agent which are separately packaged.

[0006] The main agent includes the following components in mass percentage: 15-30% AQUAPAC 8287 water-based resin, 30-55% AQUAPAC8233 resin, 1-3% dispersant, 10-20% water, 0.2-2% wetting agent, 0.2-0.5% thickener, 0.3-2% wetting defoamer, and 5-13% cosolvent;

[0007] The curing agent comprises the following components in percentage by mass: 70-90% of HT100 curing agent and 10-30% of propylene glycol diacetate.

[0008] Preferably, the main agent comprises the following components in mass percentage: 15% AQUAPAC 8287 water-based resin, 55% AQUAPAC8233 resin, 2% dispersant, 14.9% water, 2% wetting agent, 0.3% thickener, 0.8% wetting defoamer, and 10% cosolvent.

[0009] Preferably, the main agent comprises the following components in mass percentage: 20% AQUAPAC 8287 water-based resin, 50% AQUAPAC8233 resin, 2% dispersant, 14.9% water, 2% wetting agent, 0.3% thickener, 0.8% wetting defoamer, and 10% cosolvent.

[0010] Preferably, the main agent comprises the following components in mass percentage: 25% AQUAPAC 8287 water-based resin, 45% AQUAPAC8233 resin, 2% dispersant, 14.9% water, 2% wetting agent, 0.3% thickener, 0.8% wetting defoamer, and 10% cosolvent.

[0011] Preferably, the main agent comprises the following components in mass percentage: 30% AQUAPAC 8287 water-based resin, 40% AQUAPAC8233 resin, 2% dispersant, 14.9% water, 2% wetting agent, 0.3% thickener, 0.8% wetting defoamer, and 10% cosolvent.

[0012] Preferably, the cosolvent is dipropylene glycol butyl ether.

[0013] Preferably, the wetting agent is wetting agent 4100.

[0014] Preferably, the mass ratio of the main agent to the curing agent is 3:1.

[0015] Preferably, the curing agent comprises the following components in percentage by mass: 80% HT100 curing agent and 20% propylene glycol diacetate.

[0016] The present invention also provides the use of the polyurethane varnish with an ultra-long activation period described in the above technical solution in the field of rail transportation.

[0017] The invention provides a polyurethane varnish with an ultra-long activation period, comprising a main agent and a curing agent which are independently packaged, wherein the main agent comprises the following components in mass percentage: 15-30% of AQUAPAC 8287 water-based resin, 30-55% of AQUAPAC8233 resin, 1-3% of dispersant, 10-20% of water, 0.2-2% of wetting agent, 0.2-0.5% of thickener, 0.3-2% of wetting defoaming agent and 5-13% of cosolvent; and the curing agent comprises the following components in mass percentage: 70-90% of HT100 curing agent and 10-30% of propylene glycol diacetate.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention uses AQUAPAC 8287 resin and AQUAPAC8233 resin. AQUAPAC 8287 resin and AQUAPAC8233 resin contain slow-drying solvents. When used with curing agent HT100, the subsequent curing reaction time becomes longer, thereby increasing the activation period of the polyurethane varnish. The data of the embodiment show that the activation period of the polyurethane varnish of the present invention at 25° C. reaches 28 hours. Moreover, the polyurethane varnish of the present invention cannot be made into a colored paint. A very small pigment-to-base ratio (0.05) will cause the activation period of the polyurethane varnish of the present invention to become shorter. DETAILED DESCRIPTION

[0020] The invention provides a polyurethane varnish with an ultra-long activation period, comprising a main agent and a curing agent which are separately packaged.

[0021] The main agent includes the following components in mass percentage: 15-30% AQUAPAC 8287 water-based resin, 30-55% AQUAPAC8233 resin, 1-3% dispersant, 10-20% water, 0.2-2% wetting agent, 0.2-0.5% thickener, 0.3-2% wetting defoamer, and 5-13% cosolvent;

[0022] The curing agent comprises the following components in percentage by mass: 70-90% of HT100 curing agent and 10-30% of propylene glycol diacetate.

[0023] In the present invention, unless otherwise specified, the raw materials used are all commercially available products in the art.

[0024] In the present invention, the main agent preferably includes the following components in mass percentage: AQUAPAC 8287 water-based resin 15%, AQUAPAC8233 resin 55%, dispersant 2%, water 14.9%, wetting agent 2%, thickener 0.3%, wetting defoamer 0.8%, cosolvent 10%; or

[0025] The composition comprises the following components in percentage by weight: 20% AQUAPAC 8287 waterborne resin, 50% AQUAPAC 8233 resin, 2% dispersant, 14.9% water, 2% wetting agent, 0.3% thickener, 0.8% wetting defoamer, and 10% cosolvent; or

[0026] The composition comprises the following components in percentage by weight: 25% AQUAPAC 8287 waterborne resin, 45% AQUAPAC 8233 resin, 2% dispersant, 14.9% water, 2% wetting agent, 0.3% thickener, 0.8% wetting defoamer, and 10% cosolvent; or

[0027] Preferably, the main agent comprises the following components in mass percentage: 30% AQUAPAC 8287 water-based resin, 40% AQUAPAC8233 resin, 2% dispersant, 14.9% water, 2% wetting agent, 0.3% thickener, 0.8% wetting defoamer, and 10% cosolvent.

[0028] In the present invention, the cosolvent is preferably dipropylene glycol butyl ether (DPNB).

[0029] In the present invention, the AQUAPAC 8287 water-based resin and AQUAPAC8233 resin are preferably purchased from Jiangsu Fuqisen New Materials Co., Ltd.

[0030] In the present invention, the dispersant is preferably BYK-190 dispersant.

[0031] In the present invention, the water is preferably deionized water.

[0032] In the present invention, the wetting and defoaming agent is preferably 104E wetting and defoaming agent.

[0033] In the present invention, the wetting agent is preferably 4100 wetting agent.

[0034] In the present invention, the thickener is preferably thickener 8W.

[0035] In the present invention, the mass ratio of the main agent to the curing agent is preferably 3:1.

[0036] In the present invention, the curing agent preferably includes the following components in mass percentage: 80% of HT100 curing agent and 20% of propylene glycol diacetate (PGDA).

[0037] In the present invention, the curing agent is preferably purchased from HT100 curing agent Wanhua Chemical Group Co., Ltd.

[0038] The present invention has no particular limitation on the preparation method of the polyurethane varnish with an ultra-long activation period, and the varnish can be prepared by a composition preparation method well known to those skilled in the art.

[0039] In the present invention, the preparation method of the main agent preferably includes pre-mixing and blending performed sequentially.

[0040] In the present invention, water, a part of the wetting defoamer, a dispersant, AQUAPAC 8287 water-based resin and AQUAPAC 8233 resin are preferably mixed for pre-mixing to obtain a pre-mixed material.

[0041] In a specific embodiment of the present invention, it is preferred to first add the water, start stirring, and the dispersion frequency is 200 to 500 rpm, then add part of the wetting defoamer, stir for 2 to 3 minutes, and then add the dispersant, AQUAPAC8287 water-based resin and AQUAPAC8233 resin in sequence. After each addition, stir for 3 to 5 minutes before adding the next item. The stirring speed is increased to 300 to 700 rpm. After the addition, continue stirring for 15 minutes to complete the pre-refining.

[0042] After obtaining the pre-mixed material, the pre-mixed material is blended to obtain the main agent.

[0043] In a specific embodiment of the present invention, the pre-melted material and the wetting agent are preferably added to a blending cylinder, dispersed at a speed of 300 to 700 rpm for 5 minutes, and then the remaining wetting and defoaming agent is added, the stirring speed is increased to 500 to 900 rpm, stirred for 60 to 90 minutes, the stirring speed is adjusted to 300 to 700 rpm, and then the thickener and the co-solvent are added in sequence, stirring for 3 to 5 minutes after each addition, and then adding the next item, and finally stirring for 20 minutes, and sampling for inspection.

[0044] The present invention has no particular limitation on the ratio of the partial wetting defoamer to the remaining wetting defoamer, and any ratio may be used.

[0045] The present invention also provides the use of the polyurethane varnish with an ultra-long activation period described in the above technical solution in the field of rail transportation.

[0046] The present invention has no particular limitation on the specific manner of the application, and any manner familiar to those skilled in the art may be used.

[0047] The technical solutions in the present invention will be described clearly and completely below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Example 1

[0049] Preparation process of the main agent of polyurethane varnish with ultra-long activation period:

[0050] First, add the water and start stirring at a dispersing frequency of 500 rpm, then add part of the wetting and defoaming agent, stir for 3 minutes, then add the dispersant, AQUAPAC 8287 water-based resin and AQUAPAC8233 resin in sequence, stir for 5 minutes after each addition and then add the next item, increase the stirring speed to 300-700 rpm, continue stirring for 15 minutes after the addition, complete the pre-refining, put the obtained pre-refined slurry into a blending tank, add the wetting agent into the blending tank, disperse for 5 minutes at a speed of 300 rpm, then add the remaining wetting and defoaming agent, increase the stirring speed to 900 rpm, stir for 90 minutes, adjust the stirring speed to 300 rpm, then add the thickener and cosolvent in sequence, stir for 5 minutes after each addition and then add the next item, finally stir for 20 minutes, take samples for inspection, and obtain the main agent of the polyurethane varnish with an ultra-long activation period.

[0051] The main agent formulas of Examples 1 to 4 and Comparative Examples 1 to 3 are shown in Table 1. In Examples 1 to 4, resin 1 is AQUAPAC8287 water-based resin, resin 2 is AQUAPAC8233 resin, and AQUAPAC 8287 water-based resin and AQUAPAC8233 resin are both purchased from Jiangsu Fuqisen New Materials Co., Ltd. In Comparative Example 1, resin 1 is 2033 resin (purchased from Wanhua Chemical Group Co., Ltd.), and resin 2 is AQUAPAC8233 resin. In Comparative Example 2, resin 1 is 570 resin (purchased from DIC, Japan), and resin 2 is AQUAPAC8233 resin. In Comparative Example 3, resin 1 is AQUAPAC 8287 water-based resin, and resin 2 is 551 resin (purchased from DIC, Japan).

[0052] The preparation process of the main agent in Examples 2 to 4 and Comparative Examples 1 to 3 is the same as that in Example 1, the only difference being the type and amount of the raw materials.

[0053] Table 1 Main agent formula (wt%) of Examples 1 to 4 and Comparative Examples 1 to 3

[0054]

[0055] The curing agent of the embodiment and the comparative example includes the following components in mass percentage: 80% of HT100 curing agent (purchased from Wanhua Chemical Group Co., Ltd.) and 20% of propylene glycol diacetate.

[0056] The mass ratio of the main agent to the curing agent of the polyurethane varnish of the embodiment and the comparative example is 3:1.

[0057] Activation period test results (test temperature is 25°C):

[0058] The activation period of Example 1 is 18 hours, the activation period of Example 2 is 25 hours, the activation period of Example 3 is 28 hours, the activation period of Example 4 is 23 hours, the activation period of Comparative Example 1 is 12 hours, the activation period of Comparative Example 2 is 8 hours, and the activation period of Comparative Example 3 is 10 hours. It can be seen that the activation period of Example 3 is the best.

[0059] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A polyurethane varnish with an ultra-long activation period, characterized in that: Including independent packaging of main agent and curing agent, The main agent includes the following components in mass percentage: 15-30% AQUAPAC 8287 water-based resin, 30-55% AQUAPAC8233 resin, 1-3% dispersant, 10-20% water, 0.2-2% wetting agent, 0.2-0.5% thickener, 0.3-2% wetting defoamer, and 5-13% cosolvent; The curing agent comprises the following components in percentage by mass: 70-90% of HT100 curing agent and 10-30% of propylene glycol diacetate.

2. The polyurethane varnish according to claim 1, characterized in that The main agent includes the following components in percentage by mass: 15% of AQUAPAC 8287 water-based resin, 55% of AQUAPAC8233 resin, 2% of dispersant, 14.9% of water, 2% of wetting agent, 0.3% of thickener, 0.8% of wetting defoamer, and 10% of cosolvent.

3. The polyurethane varnish according to claim 1, characterized in that The main agent includes the following components in mass percentage: 20% AQUAPAC 8287 water-based resin, 50% AQUAPAC8233 resin, 2% dispersant, 14.9% water, 2% wetting agent, 0.3% thickener, 0.8% wetting defoamer, and 10% cosolvent.

4. The polyurethane varnish according to claim 1, characterized in that The main agent includes the following components in mass percentage: 25% AQUAPAC 8287 water-based resin, 45% AQUAPAC8233 resin, 2% dispersant, 14.9% water, 2% wetting agent, 0.3% thickener, 0.8% wetting defoamer, and 10% cosolvent.

5. The polyurethane varnish according to claim 1, characterized in that The main agent includes the following components in mass percentage: 30% AQUAPAC 8287 water-based resin, 40% AQUAPAC8233 resin, 2% dispersant, 14.9% water, 2% wetting agent, 0.3% thickener, 0.8% wetting defoamer, and 10% cosolvent.

6. The polyurethane varnish according to any one of claims 1 to 5, characterized in that: The cosolvent is dipropylene glycol butyl ether.

7. The polyurethane varnish according to any one of claims 1 to 5, characterized in that The wetting agent is wetting agent 4100.

8. The polyurethane varnish according to any one of claims 1 to 5, characterized in that The mass ratio of the main agent to the curing agent is 3:

1.

9. The polyurethane varnish according to claim 1, characterized in that The curing agent comprises the following components in percentage by mass: 80% of HT100 curing agent and 20% of propylene glycol diacetate.

10. Use of the polyurethane varnish with an ultra-long activation period according to any one of claims 1 to 9 in the field of rail transportation.

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