Dispersing agent for preventing flooding and floating and preparation method thereof

Abstract

The invention relates to the technical field of dispersing agent preparation, and particularly discloses a flooding and floating prevention dispersing agent and a preparation method thereof. The preparation method of the anti-flooding and anti-floating dispersing agent comprises the following steps: (1) putting conjugated oleic acid and dimer acid into a reaction kettle, then adding maleic anhydride and a catalyst, and reacting under the protection of protective gas to obtain a polymer solution A; and (2) adding water into the polymer solution A for hydrolysis, then vacuumizing, adding a diluted solvent after vacuumizing, uniformly stirring, adding polyether modified organic silicon, continuously uniformly stirring, and then filtering to obtain the flooding and floating prevention dispersing agent. The raw materials adopted by the method are wide in source and low in price, the technological process is simple, few three wastes are generated, and the prepared flooding and floating preventing dispersing agent is excellent in performance and suitable for large-scale production and application.

Description

Technical Field

[0001] The present invention relates to the technical field of dispersant preparation, and particularly relates to an anti-floating and blooming dispersant and a preparation method thereof. Background Art

[0002] In the fields of coatings, printing inks, and dyeing, the stability of color is one of the key indicators of product quality. Floating and blooming are common problems in these fields, which can lead to uneven product color, reduced aesthetics, and may affect product performance. Anti-floating and blooming dispersants are a type of professional additive developed to solve this problem. Floating refers to the phenomenon that pigments in coatings or inks are not evenly dispersed, resulting in uneven surface color. Blooming is due to the aggregation of pigment particles, which migrate to the surface during the drying process of the coating, forming color spots or patterns. Both situations will seriously affect the appearance quality of the product.

[0003] Therefore, developing a dispersant with anti-floating and blooming properties has important application value; however, in the process of producing anti-floating and blooming dispersants in the prior art, a large amount of wastewater is generated, basically reaching the level of generating one ton of wastewater for one ton of product, causing waste of resources; therefore, from an environmental protection perspective, improvement is urgently needed; in addition, the ΔE value of the anti-floating and blooming dispersant obtained by the prior art is relatively high during detection, and its quality also needs to be further improved. Summary of the Invention

[0004] In order to overcome at least one of the technical problems existing in the prior art, the present invention provides an anti-floating and blooming dispersant and a preparation method thereof.

[0005] The present invention first provides a preparation method of an anti-floating and blooming dispersant, which comprises the following steps: (1) Put conjugated oleic acid and dimer acid into a reaction kettle, then add maleic anhydride and a catalyst, and react under the protection of a protective gas to obtain polymerization liquid A; (2) Add water to polymerization liquid A for hydrolysis, then perform vacuum pumping. After the vacuum pumping is completed, add a diluting solvent, stir evenly, add polyether-modified silicone, continue to stir evenly, and then obtain the anti-floating and blooming dispersant through filtration.

[0006] Preferably, the conjugated oleic acid in step (1) is selected from one or more of linolenic acid, tung oil acid, and conjugated linoleic acid.

[0007] Preferably, the dimer acid in step (1) is selected from single-distilled dimer acid or double-distilled dimer acid.

[0008] Preferably, the catalyst in step (1) is selected from one or more of solid superacids, Lewis acids, and concentrated sulfuric acid.

[0009] Preferably, the dilution solvent described in step (2) is selected from one or more of toluene, xylene, trimethylbenzene, butyl acetate, propylene glycol methyl ether acetate, cyclohexanone, and methyl isobutyl ketone.

[0010] Preferably, in step (1), The mass ratio of conjugated linoleic acid to dimer acid is 10:1 to 3; The mass ratio of the total mass of conjugated linoleic acid and dimer acid to the mass of maleic anhydride is 10:1 to 2; The dosage of the catalyst is 0.1 to 0.5% of the total weight of conjugated linoleic acid, dimer acid, and maleic anhydride.

[0011] Preferably, for the reaction described in step (1), the reaction temperature is 180 to 200 °C, and the reaction time is 8 to 10 hours.

[0012] Preferably, in step (2), The dosage of water is 1 to 3% of the mass of polymerization liquid A; The dosage of polyether-modified silicone is 1 to 5% of the mass of polymerization liquid A.

[0013] Preferably, in step (2), For the hydrolysis, the specific conditions are: hydrolysis at 99 to 102 °C for 1 to 3 hours; For the vacuum pumping, the specific conditions are: vacuum pumping at a vacuum degree of -0.05 to 0.1 Mpa and 13 to 150 °C for 2 to 4 hours.

[0014] The present invention also provides an anti-floating and blooming dispersant prepared by the above preparation method.

[0015] Preferably, the anti-floating and blooming dispersant is an anti-floating and blooming dispersant for coatings or inks.

[0016] Beneficial effects: The present invention provides a brand-new preparation method for an anti-floating and blooming dispersant; this method innovatively uses conjugated linoleic acid, dimer acid, maleic anhydride, and polyether-modified silicone as raw materials, and adopts a brand-new preparation route to prepare the anti-floating and blooming dispersant. During the preparation process, only a very small amount (1 to 3%) of water needs to be added to prepare the anti-floating and blooming dispersant, avoiding the generation of a large amount of waste water.

[0017] In addition, the anti-floating and blooming dispersant prepared by the brand-new method described in the present invention also has a very excellent anti-floating and blooming effect, and it has a small ΔE value.

[0018] In summary, the raw materials used in this method are widely sourced, low in price, the process is simple, the generation of three wastes is extremely small, and the prepared anti-floating and blooming dispersant has excellent performance, making it suitable for large-scale production and application. Detailed Embodiments

[0019] The present invention will be further described in detail below in conjunction with specific embodiments, but the embodiments do not impose any form of limitation on the present invention.

[0020] Example 1 Preparation of Anti-Floating Color and Blooming Dispersant (1) Add 45 g of tung oil acid and 5 g of double-distilled dimer acid to the reaction kettle, then add 6 g of maleic anhydride, pass nitrogen, and raise the temperature to 110 °C. Then add 0.2 g of concentrated sulfuric acid and continue to raise the temperature to 200 °C. Start heat preservation, and the heat preservation time is 9 hours to obtain polymerization liquid A; (2) Cool the polymerization liquid A to 100 °C, add 1.2 g of H2O for hydrolysis, raise the temperature to 100 °C, keep warm for 2 hours, then carry out vacuum pumping, the vacuum degree is -0.08 MPa, and the temperature rises from the initial 100 °C to 140 °C in 1 hour. The vacuum pumping time is 3 hours. After vacuum pumping, cool to 85 °C, add 20 g of xylene and 25 g of cyclohexanone for dilution. After stirring evenly, add 2 g of polyether-modified silicone, stir evenly, then cool to below 60 °C, and carry out filtration and collection to obtain the anti-floating color and blooming dispersant A1.

[0021] Example 2 Preparation of Anti-Floating Color and Blooming Dispersant (1) Add 45 g of tung oil acid and 5 g of double-distilled dimer acid to the reaction kettle, then add 8 g of maleic anhydride, pass nitrogen, and raise the temperature to 110 °C. Then add 0.2 g of concentrated sulfuric acid and continue to raise the temperature to 180 °C. Start heat preservation, and the heat preservation time is 10 hours to obtain polymerization liquid A; (2) Cool the polymerization liquid A to 100 °C, add 1.2 g of H2O for hydrolysis, raise the temperature to 99 °C, keep warm for 2 hours, then carry out vacuum pumping, the vacuum degree is -0.08 MPa, and the temperature rises from the initial 100 °C to 140 °C in 1 hour. The vacuum pumping time is 3 hours. After vacuum pumping, cool to 85 °C, add 20 g of xylene and 25 g of methyl isobutyl ketone for dilution. After stirring evenly, add 3 g of polyether-modified silicone, stir evenly, then cool to below 60 °C, and carry out filtration and collection to obtain the anti-floating color and blooming dispersant A2.

[0022] Example 3 Preparation of Anti-Floating Color and Blooming Dispersant (1) Add 40 g of tung oil acid and 10 g of double-distilled dimer acid to the reaction kettle, then add 8 g of maleic anhydride, pass nitrogen, and raise the temperature to 110 °C. Then add 0.2 g of concentrated sulfuric acid and continue to raise the temperature to 190 °C. Start heat preservation, and the heat preservation time is 8 hours to obtain polymerization liquid A; (2) Cool the polymerization liquid A to 100°C, add 1.2 g of H2O for hydrolysis, raise the temperature to 102°C, keep it warm for 2 hours, then evacuate the air. The vacuum degree is -0.08 MPa. The temperature rises from the initial 100°C to 140°C in 1 hour, and the evacuation time is 3 hours. After evacuating the air, cool it to 85°C, add 20 g of xylene and 25 g of methyl isobutyl ketone for dilution. After stirring evenly, add 4 g of polyether-modified silicone, stir evenly, then cool it below 60°C, and filter and collect to obtain the anti-floating and blooming dispersant A3.

[0023] Experimental Example 1 For the anti-floating and blooming dispersants prepared in Examples 1 to 3 of the present invention (abbreviated as A1 to A3 in the table), the performance tests were carried out by the following methods: (1) Preparation of color paste Weigh 66.3 g of resin, 1.5 g of dispersant, 15 g of mixed solvent, 0.5 g of wetting agent, 0.5 g of the anti-floating and blooming dispersant to be tested, 0.2 g of carbon black and 16 g of titanium dioxide into an iron can, then add 100 g of glass beads, seal it and place it in an oscillator for dispersion for 2 hours to obtain the color paste.

[0024] (2) Anti-floating and blooming performance test ① After the prepared color paste is placed for 12 hours, observe the floating and blooming situation in the can.

[0025] ② Weigh 20 g of color paste, 50 g of resin and 30 g of mixed solvent into an iron can, then add 100 g of glass beads, seal it and place it in an oscillator for dispersion for 5 minutes to obtain the color paint; use a film applicator to make a film with uniform thickness from the prepared color paint. When the film is in a semi-dry state, conduct a finger rubbing test. After the film is completely dry, conduct color difference detection in the finger rubbing area and the non-finger rubbing area, and record the ΔE value.

[0026] Table 1. Performance test results of the anti-floating and blooming dispersants prepared by the present invention

[0027] It can be seen from the experimental results in Table 1 that for the anti-floating and blooming dispersants A1 to A3 prepared in Examples 1 to 3 of the present invention, there is no floating and blooming phenomenon, and their ΔE values are all less than 0.8; this shows that: the anti-floating and blooming dispersant prepared by the present invention with tung oil acid, dimer acid, maleic anhydride and polyether-modified silicone as raw materials and by adopting a new preparation route has excellent anti-floating and blooming effects.

[0028] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent transformations made by using the content of the specification of the present invention, or directly or indirectly applied in related technical fields, are equally included in the patent protection scope of the present invention.

Claims

1. A preparation method of an anti-floating and blooming dispersant, characterized in that, It includes the following steps: (1) Put conjugated linoleic acid and dimer acid into a reaction kettle, then add maleic anhydride and a catalyst, and carry out a reaction under the protection of a protective gas to obtain polymerization liquid A; (2) Add water to polymerization liquid A for hydrolysis, then carry out vacuum pumping. After the vacuum pumping is completed, add a diluting solvent, stir evenly, add polyether-modified silicone, continue to stir evenly, and then obtain the anti-floating color blooming dispersant through filtration.

2. The preparation method according to claim 1, wherein, The conjugated linoleic acid described in step (1) is selected from one or more of linolenic acid, eleostearic acid, and conjugated linoleic acid.

3. The preparation method according to claim 1, characterized in that, The dimer acid described in step (1) is selected from single-distilled dimer acid or double-distilled dimer acid.

4. The preparation method according to claim 1, wherein, The catalyst described in step (1) is selected from one or more of solid superacids, Lewis acids, and concentrated sulfuric acid.

5. The preparation method according to claim 1, wherein, The diluting solvent described in step (2) is selected from one or more of toluene, xylene, mesitylene, butyl acetate, propylene glycol methyl ether acetate, cyclohexanone, and methyl isobutyl ketone.

6. The preparation method according to claim 1, wherein In step (1), The mass ratio of conjugated linoleic acid to dimer acid is 10:1 to 3; The mass ratio of the total mass of conjugated linoleic acid and dimer acid to the mass of maleic anhydride is 10:1 to 2; The dosage of the catalyst is 0.1 to 0.5% of the total weight of conjugated linoleic acid, dimer acid, and maleic anhydride.

7. The preparation method according to claim 1, characterized in that, For the reaction described in step (1), the reaction temperature is 180 to 200 °C, and the reaction time is 8 to 10 hours.

8. The preparation method according to claim 1, wherein In step (2), The dosage of water is 1 to 3% of the mass of polymerization liquid A; The dosage of polyether-modified silicone is 1 to 5% of the mass of polymerization liquid A.

9. The preparation method according to claim 1, wherein In step (2), For the hydrolysis, the specific conditions are: hydrolysis at 99 to 102 °C for 1 to 3 hours; For the vacuum pumping, the specific conditions are: vacuum pumping at a vacuum degree of -0.05 to 0.1 Mpa and 13 to 150 °C for 2 to 4 hours.

10. An anti-floating color blooming dispersant prepared by the preparation method according to any one of claims 1 to 9.

Images