Preparation method of low-VOC (volatile organic compound) water-based paint with sand streak effect

Abstract

The invention relates to the technical field of water-based paint, in particular to a low-VOC (volatile organic compound) water-based hydroxyl acrylic coating with a sand streak effect and certain corrosion resistance and rust resistance. The preparation method comprises the following steps: adding the alkyd resin and the deionized water into a material preparation pot, and heating to 50-60 DEG C in a stirring process; uniformly dispersing the resin and the deionized water, then adding the hydroxy acrylic resin, and continuously stirring until the mixture is uniform; reducing the temperature to 10-30 DEG C, sequentially adding the defoaming agent, the precipitated barium sulphate, the anti-rust filler and the pigment, stirring, and grinding; taking out the ground slurry, then sequentially adding the water-based hydroxy acrylic resin, the base material wetting agent, the water-based polyurethane resin and the orange-peel auxiliary agent, and uniformly stirring; adding the sand streak powder, uniformly stirring, finally adding the thickening agent, and stirring again until the viscosity reaches 80-100s. The coating disclosed by the invention can be directly coated on a base material or a base material with a primer, and has the advantages of strong protection property, low VOC (Volatile Organic Compounds), high drying speed and capability of saving baking energy consumption.

Description

Technical Field

[0001] The invention relates to the technical field of water-based paints, and in particular to a low-VOC water-based hydroxy acrylic paint with a sand grain effect and anti-corrosion and anti-rust properties. Background Art

[0002] With the continuous advancement of industrialization and urbanization, environmental quality has an increasingly important impact on people's physical and mental health, so environmental quality has received more and more attention. Since the development of water-based paint, the requirements for its VOC content and performance have become more and more stringent, so the development of low-VOC and excellent-performance water-based paint has received more and more attention.

[0003] The invention patent with Chinese patent publication number CN115215964A discloses a water-based hydroxy acrylic secondary dispersion. The organic solvent content in the water-based hydroxy acrylic secondary dispersion of the patent is extremely low, and low-VOC water-based coatings can be prepared. However, the prepared coating takes a long time to dry. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a low-VOC sand-texture effect water-based paint and a preparation method thereof, so as to reduce the VOC content of the water-based paint, dry quickly and save baking time.

[0005] To achieve the above purpose, a preparation method of a low-VOC sand-texture effect water-based paint is designed, the method comprising S1, adding alkyd resin and deionized water into a preparation pot, and heating to 50-60°C during stirring; S2, dispersing the resin and deionized water evenly, and then adding hydroxyl acrylic resin, and continuing to stir until uniform; S3, lowering the temperature to 10-30°C, adding defoaming agent, precipitated barium sulfate, anti-rust filler and pigment in sequence, and grinding after stirring; S4, taking out the ground slurry, and then adding water-based hydroxyl acrylic resin, substrate wetting agent, water-based polyurethane resin and orange grain additive in sequence, and stirring evenly; S5, adding sand-texture powder, stirring evenly, and finally adding thickener, stirring again until the viscosity reaches 80-100s.

[0006] The present invention also provides a low-VOC sand-texture effect water-based paint prepared by the above-mentioned preparation method, wherein the weight percentages of the water-based paint formula are as follows: 35-45% of water-based hydroxy acrylic resin; 3-5% of water-based alkyd resin; 3-8% of water-based polyurethane resin; the additives include: 15-25% of precipitated barium sulfate; 0.1-0.2% of pH adjuster; 0.5-2.0% of sand-texture powder; 1-2% of environmentally friendly solvent; 0.5-1.0% of water-based orange-texture additive; 0.1-0.2% of substrate wetting agent; 0.2-0.3% of defoaming agent; 15-20% of deionized water; 0.2-0.3% of water-based associative modified polyurethane thickener; 0.1-0.2% of hydrophobic alkali swelling thickener; 1.0-3.0% of rust-proof filler; and 2-10% of pigment.

[0007] Preferably, the low VOC sand grain effect water-based paint provided by the present invention also includes other technical features: the water-based hydroxy acrylic resin is Fuqisen AQUAPAC-8520A, or Wanhua Chemical Antkote 2042. It has the advantages of fast drying, strong pigment encapsulation, high hardness, etc.

[0008] Preferably, the low VOC sand grain effect water-based paint provided by the present invention also includes other technical features: the water-based alkyd resin Tianhe TH-9528 has fast drying, excellent gloss, fullness, water resistance, salt spray resistance, etc., and excellent shear stability and storage stability. The water-based polyurethane resin is Wanhua water-based polyurethane dispersion Leasys 3102, which has excellent temperature resistance and adhesion, meets the requirements of good adhesion to different substrates and outdoor high temperature exposure and anti-re-stickiness, etc.

[0009] Preferably, the low VOC sand grain effect water-based paint provided by the present invention also includes other technical features: the environmentally friendly co-solvent is alcohol ester Texnol or RTC12 of Runtai Chemical, which has the advantages of low odor, high boiling point, excellent film-forming property, etc.

[0010] Preferably, the low VOC sand grain effect water-based paint provided by the present invention also includes other technical features: the defoamer is Huaxiong MHAirex 8817, which has excellent foam suppression and foam breaking properties and good compatibility. The pH regulator is AMP95, which is used to adjust the pH of the system and improve the leveling and wettability of the system.

[0011] Preferably, the low VOC sand grain effect water-based paint provided by the present invention also includes other technical features: the hydrophobic alkali swelling thickener is BASF acrylic copolymer thickener Rheovis AS1130; the water-based associative modified polyurethane thickener is Rohm and Haas RM-8W and Hemmings Rheolate 299, with a mixing ratio of 1:1. The combination of the three can improve the rheology and sedimentation system of the system to ensure that no precipitation occurs during low viscosity construction of the system, and at the same time ensure that there is no dripping at the bottom during construction and the flat appearance of uneven workpieces.

[0012] Preferably, the low-VOC sand-texture effect water-based paint provided by the present invention also includes other technical features: the anti-rust filler is Junjiang's zinc strontium phosphate B808 and inorganic high-efficiency sustained-release inhibitor Junjiang B803, and the matching ratio of zinc strontium phosphate B808 and inorganic high-efficiency sustained-release inhibitor is 2:1. It is environmentally friendly and does not contain heavy metals, and has excellent anti-rust and anti-corrosion properties.

[0013] Preferably, the low-VOC sand-texture effect water-based paint provided by the present invention further includes other technical features: the pigment is carbon black or titanium dioxide pigment, and the precipitated barium sulfate is barium sulfate produced by a 1500 mesh precipitation method.

[0014] Preferably, the low-VOC sand-texture effect water-based paint provided by the present invention also includes other technical features: the substrate wetting agent is Huaxiong MH4106, which has super strong wetting and spreading properties, and has good effects with a small amount. The orange grain auxiliary agent is L-4630 from Shanghai Deyu. The sand grain powder is Siluoer series sand grain powder, and different particle sizes of 10-150μm can be selected to produce different effects according to different effects.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are: 1. Compared with solvent-based sand-texture paint, it has the characteristics of low VOC, environmental protection and health.

[0016] 2. The prepared water-based paint can be directly applied on the substrate or on the substrate with a primer. It has the characteristics of wide application and strong protection.

[0017] 3. The construction is simple, and it can be matched with conventional isocyanate curing agent. The effect is adjustable, and it dries quickly. It can be dried naturally for 2 hours, saving baking energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 , is a sand texture effect diagram of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose and principle of the present invention more clear, it is further described below in conjunction with specific embodiments.

[0020] A method for preparing a sand-texture effect paint comprises the following steps: According to the raw material ratio, add alkyd resin and deionized water into the preparation pot, heat up to 50-60°C during stirring at 500-600r / min, keep for 30 minutes to disperse the resin and deionized water evenly, then add 25% hydroxyl acrylic resin, continue stirring for 10 minutes until uniform. Lower the temperature to 10-30°C, add defoamer, precipitated barium sulfate, anti-rust filler, pigment, etc. in turn, stir for 10 minutes and grind, grind with a roller sand mill to a fineness of ≤25μm.

[0021] Take out the qualified slurry after grinding, and then add the remaining water-based hydroxy acrylic resin, substrate wetting agent, water-based polyurethane resin, orange grain additive in turn, and stir at 900-1000r / min for 10 minutes, then add sand grain powder, stir at 1000-1200r / min for 15-20 minutes, and finally add thickener, stir at 900-1000r / min for 20 minutes after adding, and adjust the viscosity to 80-100s (T-4 cup).

[0022] The performance test results of the water-based paint are as follows: Embodiment 1: A low VOC sand grain effect water-based paint comprising the following components: 35-45% water-based hydroxyl acrylic resin, 3-5% water-based alkyd resin, 3-8% water-based polyurethane resin.

[0023] Additives: 15-25% precipitated barium sulfate, 0.1-0.2% pH regulator, 0.5-2.0% sand grain powder, 1-2% environmentally friendly solvent, 0.5-1.0% water-based orange grain additive, 0.1-0.2% substrate wetting agent, 0.2-0.3% defoamer, 15-20% deionized water, 0.2-0.3% water-based associative modified polyurethane thickener, 0.1-0.2% hydrophobic alkali swelling thickener, 1.0-3.0% anti-rust filler, 2-10% pigment; Waterborne hydroxy acrylic resin: 35%; Water-based alkyd resin 5%; Waterborne polyurethane resin 8%; pH adjuster 0.2%; Sand grain powder 0.5%; Environmentally friendly solvent: 2%; Deionized water 18.1%; Substrate wetting agent 0.1%; Defoaming agent 0.2%; Anti-rust filler 3%; Pigment 2%; Water-based orange grain additive 0.5%; Water-based associative modified polyurethane thickener 0.3%; Hydrophobic alkali swelling thickener 0.1%; Precipitate barium sulfate 25%.

[0024] Embodiment 2: A low VOC sand grain effect water-based paint comprising the following components: Waterborne hydroxy acrylic resin: 45%; Waterborne alkyd resin 3%; Waterborne polyurethane resin 3%; pH adjuster 0.1%; Sand grain powder 2%; Environmentally friendly solvent: 1%; Deionized water 18.0%; Substrate wetting agent 0.2%; Defoaming agent 0.3%; Anti-rust filler 1%; Pigment 10%; Water-based orange grain additive 1%; Water-based associative modified polyurethane thickener 0.2%; Hydrophobic alkali swelling thickener 0.2%; Precipitate barium sulfate 15%.

[0025] See also Figure 1 The low VOC sand grain effect water-based paint prepared in the above embodiment shows a sand grain effect when applied on a substrate. The sand grain is densely distributed and evenly distributed, has a three-dimensional sense of vision, and can reduce reflection. According to the above component test, the test results of the embodiment of the present invention are shown in Table 1: The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical solutions and novel concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for preparing a low-VOC sand-texture effect water-based paint, characterized in that The method comprises S1. Add alkyd resin and deionized water into the preparation pot and heat to 50-60°C during stirring; S2. Disperse the resin and deionized water evenly, then add the hydroxylated acrylic resin and continue stirring until uniform; S3. Lower the temperature to 10-30°C, add defoamer, precipitated barium sulfate, anti-rust filler and pigment in sequence, stir and grind; S4. Remove the ground slurry, and then sequentially add a water-based hydroxy acrylic resin, a substrate wetting agent, a water-based polyurethane resin and an orange peel additive, and stir evenly; S5. Add sand grain powder, stir evenly, and finally add thickener and stir again until the viscosity reaches 80-100s.

2. A low VOC sand grain effect water-based paint prepared by the preparation method as claimed in claim 1, characterized in that The weight percentages of the water-based paint formula are as follows: 35-45% water-based hydroxylated acrylic resin; 3-5% water-based alkyd resin; 3-8% waterborne polyurethane resin; Additives include: 15-25% precipitated barium sulfate; 0.1-0.2% pH adjuster; 0.5-2.0% sand grain powder; 1-2% environmentally friendly solvent; 0.5-1.0% water-based orange peel additive; 0.1-0.2% substrate wetting agent; 0.2-0.3% defoamer; 15-20% deionized water; 0.2-0.3% water-based associative modified polyurethane thickener; 0.1-0.2% hydrophobic alkali swelling thickener; 1.0-3.0% anti-rust filler; 2-10% pigment.

3. A low VOC sand grain effect water-based paint as claimed in claim 2, characterized in that: The water-based hydroxy acrylic resin is Fuqisen AQUAPAC-8520A or Wanhua Chemical Antkote 2042.

4. A low VOC sand grain effect water-based paint as claimed in claim 2, characterized in that: The waterborne alkyd resin is Tianhe TH-9528, and the waterborne polyurethane resin is Wanhua waterborne polyurethane dispersion Leasys 3102.

5. A low VOC sand grain effect water-based paint as claimed in claim 2, characterized in that: The environmentally friendly co-solvent is alcohol ester Texnol or RTC12 of Runtai Chemical.

6. A low VOC sand grain effect water-based paint as claimed in claim 2, characterized in that: The defoaming agent is Huaxiong MHAirex 8817, and the pH regulator is AMP95, which are used to adjust the pH of the system and improve the leveling and wettability of the system.

7. A low VOC sand grain effect water-based paint as claimed in claim 2, characterized in that: The hydrophobic alkali swelling thickener is BASF acrylic copolymer thickener Rheovis AS1130; the water-based associative modified polyurethane thickener is Rohm and Haas RM-8W and Hemmings Rheolate 299, with a mixing ratio of 1:1, which is used to improve the rheology and sedimentation system of the system.

8. A low VOC sand grain effect water-based paint as claimed in claim 2, characterized in that: The anti-rust filler is Junjiang's zinc strontium phosphate B808 and inorganic high-efficiency sustained-release inhibitor Junjiang B803, and the matching ratio of the zinc strontium phosphate B808 and the inorganic high-efficiency sustained-release inhibitor is 2:

1.

9. A low VOC sand grain effect water-based paint as claimed in claim 2, characterized in that: The pigment is carbon black or titanium dioxide pigment, and the precipitated barium sulfate is barium sulfate prepared by a 1500-mesh precipitation method.

10. A low VOC sand grain effect water-based paint as claimed in claim 2, characterized in that: The substrate wetting agent is Huaxiong MH4106, the orange grain auxiliary agent is Shanghai Deyu's L-4630, and the sand grain powder is Siluoer series sand grain powder.

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