Ultrahigh-weather-resistant single-component polysiloxane coating and application thereof

Abstract

The invention provides an ultrahigh weather-resistant single-component polysiloxane coating and application thereof, and belongs to the technical field of coatings. The invention provides a single-component polysiloxane coating with ultrahigh weather resistance. The single-component polysiloxane coating is prepared from the following components in percentage by mass: 2 to 60 percent of polysiloxane resin FJNB-804, 1.5 to 2.5 percent of dispersing agent, 10 to 20 percent of titanium dioxide, 0.1 to 2 percent of wetting defoaming agent, 0.2 to 1 percent of wetting agent, 5 to 10 percent of talcum powder, 0.2 to 0.6 percent of carbon black, 10 to 20 percent of water, 0.2 to 0.5 percent of thickening agent and 2 to 7 percent of cosolvent. The single-component polysiloxane coating disclosed by the invention contains the polysiloxane resin FJNB-80, the polysiloxane resin FJNB-80 is excellent in weather resistance, and the weather resistance of the provided coating can reach 7000 hours.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a single-component polysiloxane coating with ultra-high weather resistance and application thereof. Background Art

[0002] Some super weather-resistant topcoats are used on some equipment, such as the roofs of large buildings, large bridges, etc. Currently, the products with the best weather resistance are polyurethane and fluorocarbon coatings. Currently, the weather resistance of polyurethane coatings is 1000-1500h, and the weather resistance of fluorocarbon coatings is 1200-2300h. Both have the problem of low weather resistance. Summary of the invention

[0003] In view of this, the object of the present invention is to provide a one-component polysiloxane coating with ultra-high weather resistance and its application. The one-component polysiloxane coating of the present invention has a non-bubble film thickness and weather resistance of up to 7000h.

[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 single-component polysiloxane coating with ultra-high weather resistance, comprising the following components in percentage by mass: 2-60% of polysiloxane resin FJNB-804, 1.5-2.5% of dispersant, 10-20% of titanium dioxide, 0.1-2% of wetting defoamer, 0.2-1% of wetting agent, 5-10% of talc, 0.2-0.6% of carbon black, 10-20% of water, 0.2-0.5% of thickener and 2-7% of cosolvent.

[0006] Preferably, the one-component polysiloxane coating comprises the following components in mass percentage: polysiloxane resin FJNB-8045%, dispersant 2%, titanium dioxide 12%, wetting defoamer 0.8%, wetting agent 0.2%, talcum powder 10%, carbon black 0.5%, water 24.2%, thickener 0.5%, and cosolvent 4.8%.

[0007] Preferably, the one-component polysiloxane coating comprises the following components in mass percentage: polysiloxane resin FJNB-80 50%, dispersant 2%, titanium dioxide 12%, wetting defoamer 0.8%, wetting agent 0.2%, talcum powder 10%, carbon black 0.5%, water 19.2%, thickener 0.5%, and cosolvent 4.8%.

[0008] Preferably, the one-component polysiloxane coating comprises the following components in mass percentage: polysiloxane resin FJNB-8055%, dispersant 2%, titanium dioxide 12%, wetting defoamer 0.8%, wetting agent 0.2%, talcum powder 10%, carbon black 0.5%, water 14.2%, thickener 0.5%, and cosolvent 4.8%.

[0009] Preferably, the one-component polysiloxane coating comprises the following components in mass percentage: polysiloxane resin FJNB-80 60%, dispersant 2%, titanium dioxide 12%, wetting defoamer 0.8%, wetting agent 0.2%, talcum powder 10%, carbon black 0.5%, water 9.2%, thickener 0.5%, and cosolvent 4.8%.

[0010] Preferably, the dispersant is 6208 dispersant.

[0011] Preferably, the titanium dioxide is titanium dioxide 706.

[0012] Preferably, the mesh size of the talcum powder is 1250 mesh.

[0013] Preferably, the cosolvent is dipropylene glycol butyl ether.

[0014] The present invention also provides the use of the ultra-high weather-resistant one-component polysiloxane coating described in the above technical solution in the field of topcoat.

[0015] The invention provides a single-component polysiloxane coating with ultra-high weather resistance, comprising the following components in percentage by mass: 2-60% of polysiloxane resin FJNB-804, 1.5-2.5% of dispersant, 10-20% of titanium dioxide, 0.1-2% of wetting defoamer, 0.2-1% of wetting agent, 5-10% of talc, 0.2-0.6% of carbon black, 10-20% of water, 0.2-0.5% of thickener and 2-7% of cosolvent.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The one-component polysiloxane coating of the present invention contains polysiloxane resin FJNB-80. The polysiloxane resin FJNB-80 has excellent weather resistance and the weather resistance of the coating provided by the invention reaches 7000h. DETAILED DESCRIPTION

[0018] The invention provides a single-component polysiloxane coating with ultra-high weather resistance, comprising the following components in percentage by mass: 2-60% of polysiloxane resin FJNB-804, 1.5-2.5% of dispersant, 10-20% of titanium dioxide, 0.1-2% of wetting defoamer, 0.2-1% of wetting agent, 5-10% of talc, 0.2-0.6% of carbon black, 10-20% of water, 0.2-0.5% of thickener and 2-7% of cosolvent.

[0019] In the present invention, unless otherwise specified, the raw materials used are all commercially available products in the art.

[0020] In the present invention, the one-component polysiloxane coating preferably includes the following components in mass percentage: polysiloxane resin FJNB-8045%, dispersant 2%, titanium dioxide 12%, wetting defoamer 0.8%, wetting agent 0.2%, talcum powder 10%, carbon black 0.5%, water 24.2%, thickener 0.5%, cosolvent 4.8%;

[0021] Or including the following components in percentage by mass: polysiloxane resin FJNB-80 50%, dispersant 2%, titanium dioxide 12%, wetting defoamer 0.8%, wetting agent 0.2%, talc 10%, carbon black 0.5%, water 19.2%, thickener 0.5%, cosolvent 4.8%;

[0022] Or including the following components in percentage by mass: polysiloxane resin FJNB-8055%, dispersant 2%, titanium dioxide 12%, wetting defoamer 0.8%, wetting agent 0.2%, talc 10%, carbon black 0.5%, water 14.2%, thickener 0.5%, cosolvent 4.8%;

[0023] Or comprising the following components in percentage by mass: polysiloxane resin FJNB-80 60%, dispersant 2%, titanium dioxide 12%, wetting defoamer 0.8%, wetting agent 0.2%, talc 10%, carbon black 0.5%, water 9.2%, thickener 0.5%, cosolvent 4.8%.

[0024] In the present invention, the polysiloxane resin FJNB-80 is preferably purchased from Changzhou Jianuo Silicone Co., Ltd.

[0025] In the present invention, the dispersant is preferably 6208 dispersant.

[0026] In the present invention, the titanium dioxide is preferably titanium dioxide 706.

[0027] In the present invention, the mesh size of the talc is preferably 1250 mesh.

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

[0029] In the present invention, the wetting and defoaming agent is preferably 104E wetting and defoaming agent.

[0030] In the present invention, the water is preferably deionized water.

[0031] In the present invention, the wetting agent is preferably 4100 wetting agent.

[0032] In the present invention, the carbon black is preferably MA-100 carbon black.

[0033] In the present invention, the thickener is preferably 0620 thickener.

[0034] The present invention has no special limitation on the preparation method of the ultra-high weather-resistant one-component polysiloxane coating, and the coating can be prepared by a composition preparation method well known to those skilled in the art.

[0035] In the present invention, the preparation method preferably comprises pre-mixing, grinding and blending performed sequentially.

[0036] In the present invention, part of water, part of wetting defoamer, dispersant, titanium dioxide, talcum powder and carbon black are preferably mixed for pre-mixing to obtain pre-mixed material.

[0037] In a specific embodiment of the present invention, it is preferred to first add the portion of water, start stirring, and the dispersion frequency is 200 to 500 rpm, then add the portion of wetting defoaming agent, stir for 2 to 3 minutes, and then add the dispersant, titanium dioxide, talcum powder and carbon black in sequence, stirring for 3 to 5 minutes after each addition before adding the next item, and increase the stirring speed to 300 to 700 rpm. After adding, continue stirring for 15 minutes to complete the pre-refining.

[0038] After obtaining the pre-mixed material, the pre-mixed material is ground, and then flushed with the remaining water to obtain a grinding slurry.

[0039] The present invention has no particular limitation on the ratio of the partial water to the remaining water, and any ratio may be used.

[0040] In the present invention, the particle size of the polishing slurry is preferably ≤25 μm, more preferably ≤15 μm.

[0041] In the present invention, the grinding is preferably carried out in a sand mill, and the cooling water and slurry flow rates are adjusted so that the grinding temperature is preferably <50°C, the grinding pressure is preferably <0.2MPa, and monitoring and recording are preferably performed every 20 minutes; the grinding is carried out in an inverted cylinder, and the fineness is self-checked and recorded each time. After grinding to less than 25μm, samples are taken for inspection. If the fineness is qualified, the obtained pre-refined slurry is poured into a blending cylinder and ground with the remaining water to obtain a grinding slurry.

[0042] After obtaining the grinding slurry, the present invention mixes the grinding slurry, polysiloxane resin FJNB-80, wetting agent, residual wetting defoaming agent, thickener and cosolvent to obtain the ultra-high weather-resistant single-component polysiloxane coating.

[0043] 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.

[0044] In a specific embodiment of the present invention, the polysiloxane resin FJNB-80 and the wetting agent are preferably added to a mixing cylinder containing a grinding slurry, 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, and the stirring speed is adjusted to 300 to 700 rpm. Then, the thickener and the cosolvent are added in turn, and each item is stirred for 3 to 5 minutes before adding the next item, and finally stirred for 20 minutes, and samples are taken for inspection.

[0045] The present invention also provides the use of the ultra-high weather-resistant one-component polysiloxane coating described in the above technical solution in the field of topcoat.

[0046] In the present invention, the application is preferably to the roof of a large building or a large bridge.

[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 ultra-high weather-resistant one-component polysiloxane coating:

[0050] First add the water, start stirring, the dispersion frequency is 500 rpm, then add the wetting defoamer, stir for 3 minutes, then add the dispersant, titanium dioxide, talcum powder and carbon black in sequence, stir for 5 minutes after each addition, and then add the next item, increase the stirring speed to 700 rpm, continue stirring for 15 minutes after adding, and complete the pre-refining; grind the obtained pre-refined material, pass it through a sand mill, adjust the cooling water and slurry flow rate, make the grinding temperature 40°C, the grinding pressure 0.15MPa, monitor and record every 20 minutes, grind in an inverted cylinder, self-check the fineness each time and record, grind to below 25 μm, take samples for inspection, if the fineness is qualified, put the obtained pre-refined slurry into the mixing cylinder, grind with the remaining water to obtain the grinding slurry; add the polysiloxane resin FJNB-80 and the wetting agent into the mixing cylinder containing the grinding slurry, disperse at 700 rpm for 5 minutes, then add the remaining wetting defoaming agent, increase the stirring speed to 900 rpm, stir for 90 minutes, adjust the stirring speed at 700 rpm, then add the thickener and the co-solvent in turn, stir for 5 minutes after each addition, and finally stir for 20 minutes, take samples for inspection, and obtain the ultra-high weather-resistant one-component polysiloxane coating.

[0051] The formulas of Examples 1 to 4 and Comparative Examples 1 to 2 are shown in Table 1. The resin in Examples 1 to 4 is polysiloxane resin FJNB-80 (purchased from Changzhou Jianuo Silicone Co., Ltd.), the resin in Comparative Example 1 is 2403 resin (purchased from United Curing Chemical Group), and the resin in Comparative Example 2 is 2033 resin (purchased from Wanhua Chemical Group Co., Ltd.).

[0052] The preparation processes of Examples 2 to 4 and Comparative Examples 1 to 2 are the same as those of Example 1, except that the types and amounts of raw materials are different.

[0053] Table 1 Formulations of Examples 1 to 4 and Comparative Examples 1 to 2 (wt%)

[0054] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Partially deionized water 23 18 13 8 13 13 Part 104 Wetting Defoamers 0.5 0.5 0.5 0.5 0.5 0.5 6208 dispersant 2 2 2 2 2 2 Titanium Dioxide 706 12 12 12 12 12 12 1250 mesh talc 10 10 10 10 10 10 Carbon Black MA-100 0.5 0.5 0.5 0.5 0.5 0.5 Remaining deionized water 1.2 1.2 1.2 1.2 1.2 1.2 Resin 45 50 55 60 55 55 4100 Wetting Agent 0.2 0.2 0.2 0.2 0.2 0.2 Remaining 104 wetting and defoaming agent 0.3 0.3 0.3 0.3 0.3 0.3 Thickener 0620 0.5 0.5 0.5 0.5 0.5 0.5 Dipropylene glycol butyl ether 4.8 4.8 4.8 4.8 4.8 4.8

[0055] Performance Test:

[0056] Weathering resistance test standard: GB / T 14522-2008.

[0057] The weather resistance of Example 1 is 4500h, the weather resistance of Example 2 is 5500h, the weather resistance of Example 3 is 7000h, the weather resistance of Example 4 is 6500h, the weather resistance of Comparative Example 1 is 1000h, and the weather resistance of Comparative Example 2 is 1500h. It can be seen that Example 3 has the best weather resistance.

[0058] 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 one-component polysiloxane coating with ultra-high weather resistance, characterized in that: The invention comprises the following components in mass percentage: 2-60% of polysiloxane resin FJNB-804, 1.5-2.5% of dispersant, 10-20% of titanium dioxide, 0.1-2% of wetting defoamer, 0.2-1% of wetting agent, 5-10% of talc, 0.2-0.6% of carbon black, 10-20% of water, 0.2-0.5% of thickener and 2-7% of cosolvent.

2. The one-component polysiloxane coating according to claim 1, characterized in that: The one-component polysiloxane coating comprises the following components in percentage by mass: polysiloxane resin FJNB-8045%, dispersant 2%, titanium dioxide 12%, wetting defoamer 0.8%, wetting agent 0.2%, talcum powder 10%, carbon black 0.5%, water 24.2%, thickener 0.5%, and cosolvent 4.8%.

3. The one-component polysiloxane coating according to claim 1, characterized in that: The one-component polysiloxane coating comprises the following components in percentage by mass: polysiloxane resin FJNB-80 50%, dispersant 2%, titanium dioxide 12%, wetting defoamer 0.8%, wetting agent 0.2%, talcum powder 10%, carbon black 0.5%, water 19.2%, thickener 0.5%, and cosolvent 4.8%.

4. The one-component polysiloxane coating according to claim 1, characterized in that: The one-component polysiloxane coating comprises the following components in percentage by mass: polysiloxane resin FJNB-8055%, dispersant 2%, titanium dioxide 12%, wetting defoamer 0.8%, wetting agent 0.2%, talcum powder 10%, carbon black 0.5%, water 14.2%, thickener 0.5%, and cosolvent 4.8%.

5. The one-component polysiloxane coating according to claim 1, characterized in that: The one-component polysiloxane coating comprises the following components in percentage by mass: polysiloxane resin FJNB-80 60%, dispersant 2%, titanium dioxide 12%, wetting defoamer 0.8%, wetting agent 0.2%, talcum powder 10%, carbon black 0.5%, water 9.2%, thickener 0.5%, and cosolvent 4.8%.

6. The one-component polysiloxane coating according to any one of claims 1 to 5, characterized in that: The dispersant is 6208 dispersant.

7. The one-component polysiloxane coating according to any one of claims 1 to 5, characterized in that: The titanium dioxide is titanium dioxide 706.

8. The one-component polysiloxane coating according to any one of claims 1 to 5, characterized in that: The mesh number of the talcum powder is 1250 meshes.

9. The one-component polysiloxane coating according to any one of claims 1 to 5, characterized in that: The cosolvent is dipropylene glycol butyl ether.

10. Use of the ultra-high weather-resistant one-component polysiloxane coating according to any one of claims 1 to 9 in the field of topcoat.