Ultrahigh-salt-spray-resistant two-component epoxy gray primer and application thereof

Abstract

The invention provides a two-component epoxy gray primer with ultrahigh salt spray resistance and application thereof, and belongs to the technical field of coatings. A main agent of the ultrahigh salt spray resistant two-component epoxy gray primer comprises a BECKOPOX-EP-384W-53WAMP waterborne epoxy emulsion, an anti-rust pigment B900 and an anti-rust pigment 803, and a curing agent comprises a curing agent 3986. The two-component epoxy gray primer disclosed by the invention not only can meet the requirements of customers at the normal film thickness (80 microns), but also can achieve the salt spray resistance of more than 2000h at the thickness of 30-50 microns by adopting the BECKOPOX-EP-384W-53WAMP waterborne epoxy emulsion matched with the anti-rust pigment B900 and the anti-rust pigment 803 and adding the curing agent 3986, and the salt spray resistance is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a two-component epoxy grey primer with ultra-high salt spray resistance and application thereof. Background Art

[0002] In rail transit coatings, the existing epoxy primer with a film thickness of 80μm is required to have a salt spray resistance of more than 1500h, and some can even reach around 1700h. However, there is still a problem of poor salt spray resistance. Summary of the invention

[0003] In view of this, the object of the present invention is to provide a two-component epoxy gray primer with ultra-high salt spray resistance and application thereof. The two-component epoxy gray primer of the present invention has excellent salt spray resistance.

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

[0005] The present invention provides a two-component epoxy grey primer with ultra-high salt spray resistance, comprising a main agent and a curing agent which are packaged separately.

[0006] The main agent comprises the following components in mass percentage: 25-45% BECKOPOX-EP-384W-53WAMP water-based epoxy emulsion, 1-3% dispersant, 8-12% titanium dioxide, 4-10% anti-rust pigment B900, 2-8% anti-rust pigment 803, 0.1-0.5% carbon black, 5-10% mica powder, 5-8% wollastonite, 5-10% precipitated barium sulfate, 10-20% water, 0.2-1% wetting and defoaming agent, 0.1-0.5% wetting agent, 0.2-0.5% thickener, 0.5-1% silane coupling agent, 0.2-0.5% defoaming agent, and 2-5% cosolvent;

[0007] The curing agent comprises the following components in percentage by mass: 20-60% of 3986 curing agent, 20-45% of water, and 5-20% of propylene glycol methyl ether acetate.

[0008] Preferably, the main agent includes the following components in mass percentage: 40% BECKOPOX-EP-384W-53WAMP water-based epoxy emulsion, 2% dispersant, 9% titanium dioxide, 8% anti-rust pigment B900, 35% anti-rust pigment 80, 0.3% carbon black, 8% mica powder, 5% wollastonite, 5% precipitated barium sulfate, 13% water, 0.5% wetting and defoaming agent, 0.2% wetting agent, 0.5% thickener, 1% silane coupling agent, 0.3% defoaming agent, and 2.2% cosolvent.

[0009] Preferably, the main agent includes the following components in mass percentage: 40% BECKOPOX-EP-384W-53WAMP water-based epoxy emulsion, 2% dispersant, 9% titanium dioxide, 5% anti-rust pigment B900, 38% anti-rust pigment 80, 0.3% carbon black, 8% mica powder, 5% wollastonite, 5% precipitated barium sulfate, 13% water, 0.5% wetting and defoaming agent, 0.2% wetting agent, 0.5% thickener, 1% silane coupling agent, 0.3% defoaming agent, and 2.2% cosolvent.

[0010] Preferably, the main agent includes the following components in mass percentage: BECKOPOX-EP-384W-53WAMP water-based epoxy emulsion 40%, dispersant 2%, titanium dioxide 9%, anti-rust pigment B900 10%, anti-rust pigment 80 33%, carbon black 0.3%, mica powder 8%, wollastonite 5%, precipitated barium sulfate 5%, water 13%, wetting and defoaming agent 0.5%, wetting agent 0.2%, thickener 0.5%, silane coupling agent 1%, defoaming agent 0.3%, and cosolvent 2.2%.

[0011] Preferably, the main agent includes the following components in mass percentage: 40% BECKOPOX-EP-384W-53WAMP water-based epoxy emulsion, 2% dispersant, 9% titanium dioxide, 7% anti-rust pigment B900, 36% anti-rust pigment 80, 0.3% carbon black, 8% mica powder, 5% wollastonite, 5% precipitated barium sulfate, 13% water, 0.5% wetting and defoaming agent, 0.2% wetting agent, 0.5% thickener, 1% silane coupling agent, 0.3% defoaming agent, and 2.2% cosolvent.

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

[0013] Preferably, the mesh number of the wollastonite is 1250 mesh.

[0014] Preferably, the mass ratio of the main agent to the curing agent is 5:1.

[0015] Preferably, the curing agent comprises the following components in percentage by mass: 56% of 3986 curing agent, 39% of water, and 5% of propylene glycol methyl ether acetate.

[0016] The present invention also provides the use of the ultra-high salt spray resistant two-component epoxy gray primer described in the above technical solution in the field of rail transportation.

[0017] The invention provides a two-component epoxy gray primer with ultra-high salt spray resistance, comprising a main agent and a curing agent which are separately packaged, wherein the main agent comprises the following components in mass percentage: 25-45% of BECKOPOX-EP-384W-53WAMP waterborne epoxy emulsion, 1-3% of a dispersant, 8-12% of titanium dioxide, 4-10% of an antirust pigment B900, 2-8% of an antirust pigment 803, 0.1-0.5% of carbon black, and 5-1% of mica powder. 0%, wollastonite 5-8%, precipitated barium sulfate 5-10%, water 10-20%, wetting defoamer 0.2-1%, wetting agent 0.1-0.5%, thickener 0.2-0.5%, silane coupling agent 0.5-1%, defoamer 0.2-0.5%, cosolvent 2-5%; the curing agent includes the following components in mass percentage: 3986 curing agent 20-60%, water 20-45%, propylene glycol methyl ether acetate 5-20%.

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

[0019] The two-component epoxy gray primer of the present invention can not only meet customer requirements at a normal film thickness (80 μm), but also adopts BECKOPOX-EP-384W-53WAMP water-based epoxy emulsion, is matched with anti-rust pigment B900 and anti-rust pigment 803, and is added with 3986 curing agent, so that the salt spray resistance at a thickness of 30 to 50 μm can reach more than 2000 hours, and the salt spray resistance is significantly improved. DETAILED DESCRIPTION

[0020] The present invention provides a two-component epoxy grey primer with ultra-high salt spray resistance, comprising a main agent and a curing agent which are packaged separately.

[0021] The main agent comprises the following components in mass percentage: 25-45% BECKOPOX-EP-384W-53WAMP water-based epoxy emulsion, 1-3% dispersant, 8-12% titanium dioxide, 4-10% anti-rust pigment B900, 2-8% anti-rust pigment 803, 0.1-0.5% carbon black, 5-10% mica powder, 5-8% wollastonite, 5-10% precipitated barium sulfate, 10-20% water, 0.2-1% wetting and defoaming agent, 0.1-0.5% wetting agent, 0.2-0.5% thickener, 0.5-1% silane coupling agent, 0.2-0.5% defoaming agent, and 2-5% cosolvent;

[0022] The curing agent comprises the following components in percentage by mass: 20-60% of 3986 curing agent, 20-45% of water, and 5-20% of propylene glycol methyl ether acetate.

[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: BECKOPOX-EP-384W-53WAMP water-based epoxy emulsion 40%, dispersant 2%, titanium dioxide 9%, anti-rust pigment B9008%, anti-rust pigment 8035%, carbon black 0.3%, mica powder 8%, wollastonite 5%, precipitated barium sulfate 5%, water 13%, wetting defoamer 0.5%, wetting agent 0.2%, thickener 0.5%, silane coupling agent 1%, defoamer 0.3%, cosolvent 2.2%; or

[0025] The composition comprises the following components in percentage by mass: 40% BECKOPOX-EP-384W-53WAMP waterborne epoxy emulsion, 2% dispersant, 9% titanium dioxide, 5% antirust pigment B900, 8% antirust pigment 803, 0.3% carbon black, 8% mica powder, 5% wollastonite, 5% precipitated barium sulfate, 13% water, 0.5% wetting and defoaming agent, 0.2% wetting agent, 0.5% thickener, 1% silane coupling agent, 0.3% defoaming agent, and 2.2% cosolvent; or

[0026] The composition comprises the following components in percentage by mass: 40% BECKOPOX-EP-384W-53WAMP waterborne epoxy emulsion, 2% dispersant, 9% titanium dioxide, 10% anti-rust pigment B900, 33% anti-rust pigment 80, 0.3% carbon black, 8% mica powder, 5% wollastonite, 5% precipitated barium sulfate, 13% water, 0.5% wetting and defoaming agent, 0.2% wetting agent, 0.5% thickener, 1% silane coupling agent, 0.3% defoaming agent and 2.2% cosolvent; or

[0027] The invention comprises the following components in mass percentage: 40% BECKOPOX-EP-384W-53WAMP water-based epoxy emulsion, 2% dispersant, 9% titanium dioxide, 7% anti-rust pigment B900, 36% anti-rust pigment 80, 0.3% carbon black, 8% mica powder, 5% wollastonite, 5% precipitated barium sulfate, 13% water, 0.5% wetting and defoaming agent, 0.2% wetting agent, 0.5% thickener, 1% silane coupling agent, 0.3% defoaming agent and 2.2% cosolvent.

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

[0029] In the present invention, the BECKOPOX-EP-384W-53WAMP waterborne epoxy emulsion is preferably purchased from Allnex Resins (China) Co., Ltd.

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

[0031] In the present invention, the titanium dioxide is preferably titanium dioxide 996.

[0032] In the present invention, the anti-rust pigment B900 and anti-rust pigment 803 are preferably purchased from Shanghai Junjiang Material Technology Co., Ltd.

[0033] In the present invention, the mica powder is preferably GA-4 mica powder.

[0034] In the present invention, the mesh number of the wollastonite is preferably 1250 mesh.

[0035] In the present invention, the water is preferably deionized water.

[0036] In the present invention, the wetting and defoaming agent is preferably 104E wetting and defoaming agent.

[0037] In the present invention, the wetting agent is preferably 4100 wetting agent.

[0038] In the present invention, the thickener is preferably thickener 0620.

[0039] In the present invention, the silane coupling agent is preferably 915 silane coupling agent.

[0040] In the present invention, the mass ratio of the main agent to the curing agent is preferably 5:1.

[0041] In the present invention, the curing agent preferably includes the following components in percentage by mass: 56% of 3986 curing agent, 39% of water, and 5% of propylene glycol methyl ether acetate (PMA).

[0042] In the present invention, the 3986 curing agent is preferably Huntsman Aradur 3986 modified amine water-based curing agent.

[0043] The present invention has no special limitation on the preparation method of the ultra-high salt spray resistant two-component epoxy gray primer, and the primer can be prepared by a preparation method of a composition well known to those skilled in the art.

[0044] In the present invention, the preparation method of the main agent preferably comprises pre-mixing, grinding and blending performed in sequence.

[0045] In the present invention, part of water, a wetting defoamer, a dispersant, titanium dioxide, antirust pigment B900, antirust pigment 803, precipitated barium sulfate, carbon black, mica powder and wollastonite are preferably mixed for pre-refining to obtain a pre-refined material.

[0046] In a specific embodiment of the present invention, it is preferred to first add the part of water, start stirring, and the dispersion frequency is 200 to 500 rpm, then add the wetting defoamer, stir for 2 to 3 minutes, and then add the anti-rust pigment B900, anti-rust pigment 803, wollastonite precipitation, barium sulfate precipitation, carbon black and mica powder in sequence, stir for 3 to 5 minutes after each addition, and then add the next item, increase the stirring speed to 300 to 700 rpm, and continue stirring for 15 minutes after the addition, to complete the pre-refining.

[0047] After obtaining the pre-melted material, the pre-melted material is ground, and then flushed with the remaining water to obtain a grinding slurry.

[0048] The present invention has no particular limitation on the ratio of the partial water to the remaining water, and any ratio may be used.

[0049] In the present invention, the particle size of the polishing slurry is preferably ≤30 μm, more preferably ≤10 μm.

[0050] 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 the fineness is below 30μm, 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.

[0051] After obtaining the grinding slurry, the present invention mixes the grinding slurry, BECKOPOX-EP-384W-53WAMP water-based epoxy emulsion, a wetting agent, a defoaming agent, a thickener, a silane coupling agent and a cosolvent to obtain the main agent.

[0052] In a specific embodiment of the present invention, the BECKOPOX-EP-384W-53WAMP aqueous epoxy emulsion 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 a defoamer 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, a thickener, a silane coupling agent and a cosolvent are added in sequence, 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.

[0053] The present invention also provides the use of the ultra-high salt spray resistant two-component epoxy gray primer described in the above technical solution in the field of rail transportation.

[0054] 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.

[0055] 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.

[0056] Example 1

[0057] Preparation process of the main agent of ultra-high salt spray resistant two-component epoxy gray primer:

[0058] First add the water, start stirring, the dispersion frequency is 500 rpm, then add the wetting defoamer, stir for 3 minutes, then add the anti-rust pigment B900, anti-rust pigment 803, wollastonite precipitation, barium sulfate precipitation, carbon black and mica powder 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 it in an inverted cylinder, self-check the fineness each time and record it, grind to 10 μm or less, take samples for inspection, and 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 BECKOPOX-EP-384W-53WAMP water-based epoxy emulsion and wetting agent into the mixing cylinder containing the grinding slurry, disperse at 700 rpm for 5 minutes, then add defoamer, increase the stirring speed to 900 rpm, stir for 90 minutes, adjust the stirring speed at 700 rpm, and then add thickener, silane coupling agent and cosolvent in turn, stir for 5 minutes after each addition, and finally stir for 20 minutes, take samples for inspection, and obtain the main agent of the two-component epoxy gray primer with ultra-high salt spray resistance.

[0059] The main agent 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 BECKOPOX-EP-384W-53WAMP water-based epoxy emulsion (purchased from Allnex Resins (China) Co., Ltd.), the resin in Comparative Example 1 is 2092 resin (purchased from United Curing Group), and the resin in Comparative Example 2 is 522 resin (purchased from Polycoat Technology (Dongguan) Co., Ltd.).

[0060] 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.

[0061] Table 1 Main agent formula (wt%) of Examples 1 to 4 and Comparative Examples 1 to 2

[0062] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Partially deionized water 12 12 12 12 12 12 104 Wetting and defoaming agent 0.5 0.5 0.5 0.5 0.5 0.5 BYK190 dispersant 2 2 2 2 2 2 Titanium Dioxide 996 9 9 9 9 9 9 Anti-rust pigment B900 8 5 10 7 8 8 Anti-rust pigment 803 5 8 3 6 5 5 1250 mesh wollastonite 5 5 5 5 5 5 Precipitated barium sulfate 5 5 5 5 5 5 Carbon Black MA-100 0.3 0.3 0.3 0.3 0.3 0.3 GA-4 Mica Powder 8 8 8 8 8 8 Remaining deionized water 1 1 1 1 1 1 Resin 40 40 40 40 40 40 4100 Wetting Agent 0.2 0.2 0.2 0.2 0.2 0.2 BYK-028 defoamer 0.3 0.3 0.3 0.3 0.3 0.3 0620 Thickener 0.5 0.5 0.5 0.5 0.5 0.5 915 silane coupling agent 1 1 1 1 1 1 Dipropylene glycol butyl ether 2.2 2.2 2.2 2.2 2.2 2.2

[0063] The curing agent of the embodiments and comparative examples includes the following components in percentage by mass: 56% of 3986 curing agent (Huntsman Aradur 3986 modified amine water-based curing agent), 39% of water, and 5% of propylene glycol methyl ether acetate.

[0064] In the two-component epoxy grey primer of the embodiment and the comparative example, the mass ratio of the main agent to the curing agent is 5:1.

[0065] Performance Testing:

[0066] Salt spray resistance test standard: GB / T 1771.

[0067] The salt spray resistance time of the coating with a thickness of 40-50 μm in Example 1 is 2000 h, the salt spray resistance time of the coating with a thickness of 40-50 μm in Example 2 is 1800 h, the salt spray resistance time of the coating with a thickness of 40-50 μm in Example 3 is 1800 h, the salt spray resistance time of the coating with a thickness of 40-50 μm in Example 4 is 1900 h, the salt spray resistance time of the coating with a thickness of 40-50 μm in Comparative Example 1 is 1000 h, and the salt spray resistance time of the coating with a thickness of 40-50 μm in Comparative Example 2 is 800 h. It can be seen that the salt spray resistance performance of Example 1 is the best.

[0068] 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 two-component epoxy grey primer with ultra-high salt spray resistance, characterized in that: Including independent packaging of main agent and curing agent, The main agent comprises the following components in mass percentage: 25-45% BECKOPOX-EP-384W-53WAMP water-based epoxy emulsion, 1-3% dispersant, 8-12% titanium dioxide, 4-10% anti-rust pigment B900, 2-8% anti-rust pigment 803, 0.1-0.5% carbon black, 5-10% mica powder, 5-8% wollastonite, 5-10% precipitated barium sulfate, 10-20% water, 0.2-1% wetting and defoaming agent, 0.1-0.5% wetting agent, 0.2-0.5% thickener, 0.5-1% silane coupling agent, 0.2-0.5% defoaming agent, and 2-5% cosolvent; The curing agent comprises the following components in percentage by mass: 20-60% of 3986 curing agent, 20-45% of water, and 5-20% of propylene glycol methyl ether acetate.

2. The two-component epoxy grey primer according to claim 1, characterized in that: The main agent includes the following components in mass percentage: 40% BECKOPOX-EP-384W-53WAMP water-based epoxy emulsion, 2% dispersant, 9% titanium dioxide, 8% anti-rust pigment B900, 35% anti-rust pigment 80, 0.3% carbon black, 8% mica powder, 5% wollastonite, 5% precipitated barium sulfate, 13% water, 0.5% wetting and defoaming agent, 0.2% wetting agent, 0.5% thickener, 1% silane coupling agent, 0.3% defoaming agent, and 2.2% cosolvent.

3. The two-component epoxy grey primer according to claim 1, characterized in that: The main agent includes the following components in mass percentage: 40% BECKOPOX-EP-384W-53WAMP water-based epoxy emulsion, 2% dispersant, 9% titanium dioxide, 5% anti-rust pigment B900, 38% anti-rust pigment 80, 0.3% carbon black, 8% mica powder, 5% wollastonite, 5% precipitated barium sulfate, 13% water, 0.5% wetting and defoaming agent, 0.2% wetting agent, 0.5% thickener, 1% silane coupling agent, 0.3% defoaming agent, and 2.2% cosolvent.

4. The two-component epoxy grey primer according to claim 1, characterized in that: The main agent includes the following components in mass percentage: 40% BECKOPOX-EP-384W-53WAMP water-based epoxy emulsion, 2% dispersant, 9% titanium dioxide, 10% anti-rust pigment B900, 33% anti-rust pigment 80, 0.3% carbon black, 8% mica powder, 5% wollastonite, 5% precipitated barium sulfate, 13% water, 0.5% wetting and defoaming agent, 0.2% wetting agent, 0.5% thickener, 1% silane coupling agent, 0.3% defoaming agent, and 2.2% cosolvent.

5. The two-component epoxy grey primer according to claim 1, characterized in that: The main agent includes the following components in mass percentage: 40% BECKOPOX-EP-384W-53WAMP water-based epoxy emulsion, 2% dispersant, 9% titanium dioxide, 7% anti-rust pigment B90, 36% anti-rust pigment 80, 0.3% carbon black, 8% mica powder, 5% wollastonite, 5% precipitated barium sulfate, 13% water, 0.5% wetting and defoaming agent, 0.2% wetting agent, 0.5% thickener, 1% silane coupling agent, 0.3% defoaming agent, and 2.2% cosolvent.

6. The two-component epoxy grey primer according to any one of claims 1 to 5, characterized in that: The cosolvent is dipropylene glycol butyl ether.

7. The two-component epoxy grey primer according to any one of claims 1 to 5, characterized in that: The mesh number of the wollastonite is 1250 meshes.

8. The two-component epoxy grey primer according to any one of claims 1 to 5, characterized in that: The mass ratio of the main agent to the curing agent is 5:

1.

9. The two-component epoxy grey primer according to claim 1, characterized in that: The curing agent comprises the following components in percentage by mass: 56% of 3986 curing agent, 39% of water, and 5% of propylene glycol methyl ether acetate.

10. Use of the ultra-high salt spray resistant two-component epoxy grey primer according to any one of claims 1 to 9 in the field of rail transportation.