Preparation method of volatile organic-free water-based color correction material and application thereof

Abstract

The present application provides a kind of water-based color material without volatile organic compounds, water-based color material for the bottom touch-up, surface touch-up of coating in the field of wood, its composition is 40-50 parts by weight, water-based polyurethane dispersion 25-35 parts, wetting and leveling agent 0.25-0.75 parts, wetting dispersant 1-2 parts, defoaming agent 1.5-3.5 parts, thickening agent 0.5-2 parts, PH regulator 0.1-0.2 parts, water 10-20 parts;The water-based coloring material of the present application, based on the characteristics of water-based acrylic emulsion, strong adhesion, excellent weather resistance, combined with water-based polyurethane dispersion, excellent film forming, excellent toughness, can realize the performance advantages of water-based touch-up coating, such as good adhesion, uniform touch-up, excellent color retention, etc.;The present application material does not artificially add any volatile organic solvent, realizes the emission of truly meaningful volatile organic compounds and construction, at the same time, safe, healthy, non-toxic and environmental protection, can realize coloring on any substrate or substrate, not bite bottom, not fall off.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of water-based wood paint, and particularly relates to a preparation method of a volatile organic compound-free water-based color correction material and application thereof. BACKGROUND

[0002] Compared with traditional solvent-based materials, water-based materials use water as a diluent, reducing environmental pollution. Traditional solvent-based paints contain volatile organic compounds (VOCs), which are volatilized during the painting process, harmful to air quality and human health. The VOC content of water-based paint is relatively greatly reduced, has less impact on the environment and human health, meets environmental protection requirements, and gradually replaces the use of traditional solvent-based paint in the process of marketization in the wood field.

[0003] However, in the water-based wood field, the painting process is special due to the color correction process. A large amount of "pseudo-water-based" products containing alcohol or a large amount of organic solvents are used for color correction construction for a long time, which does not meet the national standards and relevant policies and regulations, has a strong odor, and has extremely low utilization efficiency, seriously affecting the progress of water-based painting in the wood field. Under this background, it is urgent to develop a water-based color correction material that does not emit volatile organic compounds (VOCs) and does not affect the current performance of customers. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings of the prior art and provide a preparation method of a volatile organic compound-free water-based color correction material and application thereof. The water-based color correction material not only avoids the emission of volatile organic compounds (VOCs) from the source, but also meets the color correction effect and performance requirements in actual application.

[0005] The purpose of the present application is achieved by the following technical solution: a volatile organic compound-free water-based color correction material prepared from the following weight ratio of raw materials:

[0006] Water-based acrylic emulsion 40-50 parts

[0007] Water-based polyurethane dispersion 25-35 parts

[0008] Wetting and leveling agent 0.25-0.75 parts

[0009] Wetting dispersant 1-2 parts

[0010] Defoamer 0.2-0.4 parts

[0011] Thickening agent 0.5-2 parts

[0012] PH regulator 0.1-0.2 parts

[0013] Deionized water 10-20 parts

[0014] The preparation method of the water-based acrylic emulsion is as follows: methyl methacrylate is used as a monomer, and room temperature self-crosslinking is used to synthesize diacetone acrylamide and oxalyl diamide, and the mass ratio of the methyl methacrylate, the diacetone acrylamide and the oxalyl diamide is 1:1:1.

[0015] The preparation method of the water-based polyurethane dispersion is as follows: a melting process dispersion method is used, hexamethylene diisocyanate is used as a prepolymer, and polytetrahydrofuran glycol-2000 is synthesized, and the mass ratio of the hexamethylene diisocyanate and the polytetrahydrofuran glycol-2000 is 1.5:1.

[0016] Further, the content of the weight percentage is as follows:

[0017] The water-based acrylic emulsion is 40 parts.

[0018] The water-based polyurethane dispersion is 35 parts.

[0019] The wetting and leveling agent is 0.5 parts.

[0020] The wetting dispersant is 1 part.

[0021] The defoaming agent is 0.3 parts.

[0022] The thickening agent is 1.5 parts.

[0023] The PH regulator is 0.1 part.

[0024] The deionized water is 18.6 parts.

[0025] Further, the wetting and leveling agent is a solvent-free polyether siloxane wetting and leveling agent, such as BYK-345 of Germany BYK.

[0026] Further, the wetting dispersant is anionic, non-ionic, and multi-functional type without solvent and ethoxylated nonyl phenol, such as TEGO Dispers 755W (copolymer aqueous solution with high pigment affinity group) or TEGO Dispers 760W (surfactant with multi-functional type and aqueous solution containing pigment affinity group) of Germany TEGO.

[0027] Further, the defoaming agent is an organic silicon type and / or an organic modified polysiloxane emulsion, such as Foamex 810 (defoaming agent concentrate) of Germany TEGO and SURFYNOL AD01 of America gas chemistry.

[0028] Further, the thickening agent is an acrylic and polyurethane type water-based associated thickening agent, such as PUR 61 (non-ionic water-based polyurethane) of Germany Munzing.

[0029] Further, the PH regulator is an organic acid base buffer. Preferably, the alcohol amine has little odor, such as AMP-95 (molecular structure is 2-amino-2-methyl-1-propanol) of ANGUS in the United States. The purpose of adjusting the pH value of the putty is to ensure the stability during storage, and the pH value is generally controlled between 7 and 9, and the amount of addition is 0.1-0.3 parts, and the preferred amount of addition is 0.1 part.

[0030] Further, the deionized water is filtered water with TDS less than 100 PPM.

[0031] The application also provides a preparation method of the above-mentioned volatile organic-free water-based color correction material, comprising the following steps:

[0032] (1) The water-based acrylic emulsion and the water-based polyurethane dispersion are put into a container tank; a part of water is mixed with a PH regulator and then slowly put into the container tank, and the stirring speed is 500-800 r / min for 2 minutes until uniform; wherein the part of water accounts for 1 / 10-1 / 9 of the total amount of water;

[0033] (2) The thickening agent, the wet leveling agent, the wet dispersing agent and the defoaming agent are slowly put into the container tank under the condition of medium speed stirring (500-800 r / min), and the stirring speed is 500-800 r / min for 2 minutes until uniform;

[0034] (3) The stirring speed is 800-1000 r / min for 30 minutes, the remaining water is added, and the product is filtered, detected and packaged.

[0035] The application also provides the above-mentioned volatile organic-free water-based color correction material for the application of wood paint. Specifically, the water-based color material is used for the bottom color correction and the surface color correction in the field of wood coating.

[0036] When used for the application of wood paint, the pigment color concentrate or the color paste is directly added by using the method known in the art, and then uniformly sprayed on the coated object.

[0037] The application has the following beneficial effects:

[0038] 1. The water-based acrylic emulsion synthesized by using diacetone acrylamide and oxalyl diamide (1.1:1) by adopting the room temperature self-crosslinking technology has excellent adhesion to the coated object, and the color correction process has the characteristics of not easy to bloom, gloss retention and color retention.

[0039] 2. The water-based polyurethane dispersion synthesized by using hexamethylene diisocyanate (HDI) as a prepolymer and polytetramethylene glycol (PTMG)-2000 has excellent film forming effect, good film toughness and excellent fullness when matched with the water-based acrylic emulsion.

[0040] 3、The present application adopts defoaming agent with film forming effect, which helps to defoam paint film and ensures film forming effect at polar temperature with waterborne polyurethane dispersion.

[0041] 4、The product of the present application can be used directly by adding water, has no use time limit, and is used without adding water.

[0042] 5、The waterborne color correction material of the present application is a waterborne environmentally friendly product, has no VCO emission compared with conventional products, and can meet the increasing demand of customers for health and safety. DETAILED DESCRIPTION

[0043] The technical solutions of the present application will be described in further detail below in combination with the drawings, but the protection scope of the present application is not limited to the following description.

[0044] Example 1: The main film forming material is prepared by using waterborne acrylic emulsion

[0045] Waterborne acrylic emulsion 40 parts

[0046] Waterborne polyurethane dispersion 35 parts

[0047] Byk-345 0.5 parts

[0048] Tego-755W 1 part

[0049] Tego-810 0.3 parts

[0050] AD01 3 parts

[0051] PUR 611 1.5 parts

[0052] AMP-95 0.1 part

[0053] Deionized water 18.6 parts

[0054] Preparation method: waterborne acrylic emulsion 40 parts, waterborne polyurethane dispersion 35 parts are put into a container tank; first mix 2 parts of water with AMP-95 0.1 part, then slowly put into the container, and mix at medium speed 500-800 r / min for 2 minutes until uniform; slowly add TEGO Dispers 755W 1 part, Tego-810 0.3 part, AD01 3 parts under stirring at medium speed 500-800 r / min, and stir at high speed 800-1000 r / min for 30 minutes; finally add the remaining deionized water 17.8 parts, adjust the viscosity and filter.

[0055] Comparative Example 1 (using waterborne acrylic emulsion instead of waterborne polyurethane dispersion in equal amount)

[0056] Waterborne acrylic emulsion 75 parts

[0057] Byk-345 0.5 parts

[0058] Tego-755W 1 part

[0059] Tego-810 0.3 parts

[0060] AD01 3 parts

[0061] PUR 61 1.5 parts

[0062] AMP-95 0.1 parts

[0063] Deionized water 18.6 parts

[0064] Preparation method: Put 75 parts of the aqueous acrylic emulsion into the container tank, first mix 2 parts of water with 0.1 parts of AMP-95, then slowly pour into the container, medium speed 500-800 r / min change stirring for 2 minutes to uniform; slowly pour 1 part of TEGO Dispers 715W, 0.3 parts of Tego-810, 3 parts of AD01 into the container under medium speed 500-800 r / min stirring, high speed 800-1000 r / min stirring for 30 minutes; finally add the remaining 17.8 parts of deionized water, adjust the viscosity and filter.

[0065] Comparative Example 2 (using a common aqueous acrylic emulsion to replace the aqueous acrylic emulsion of the present application)

[0066] The preparation process is the same as Example 1, except that the aqueous color correction material of the present comparative example is made of a conventional aqueous acrylic emulsion, such as DSM XK-14 or Wanhua 4509, and the components are as follows:

[0067] 4509 40 parts

[0068] Aqueous polyurethane dispersion 35 parts

[0069] Byk-345 0.5 parts

[0070] Tego-755W 1 part

[0071] Tego-810 0.3 parts

[0072] AD01 3 parts

[0073] PUR 61 1.5 parts

[0074] AMP-95 0.1 parts

[0075] Deionized water 18.6 parts

[0076] Comparative Example 3 (using a common aqueous polyurethane dispersion to replace the aqueous polyurethane dispersion of the present application)

[0077] The preparation process is the same as Example 1, except that the waterborne color correction material of this control example is made of a conventional waterborne polyurethane dispersion, such as Wanhua Crysol 6130, with the following components:

[0078] Waterborne acrylic emulsion 40 parts

[0079] Crysol 6130 35 parts

[0080] Byk-345 0.5 parts

[0081] Tego-755W 1 part

[0082] Tego-810 0.3 parts

[0083] AD01 3 parts

[0084] PUR 61 1.5 parts

[0085] AMP-95 0.1 parts

[0086] Deionized water 18.6 parts

[0087] Comparative Example 4 (without using AD01 with film-forming effect)

[0088] Waterborne acrylic emulsion 40 parts

[0089] Waterborne polyurethane dispersion 35 parts

[0090] Byk-345 0.5 parts

[0091] Tego-755W 1 part

[0092] Tego-810 0.3 parts

[0093] PUR 61 1.5 parts

[0094] AMP-95 0.1 parts

[0095] Deionized water 21.6 parts

[0096] Preparation method: Put 40 parts of waterborne acrylic emulsion and 35 parts of waterborne polyurethane dispersion into a container tank; mix 2 parts of water with 0.1 parts of AMP-95, then slowly pour into the container, and stir at medium speed 500-800 r / min for 2 minutes until uniform; slowly pour 1 part of TEGO Dispers 715W and 0.3 parts of Tego-810 into the container under medium speed 500-800 r / min stirring, and stir at high speed 800-1000 r / min for 30 minutes; finally add the remaining 20.8 parts of deionized water, adjust the viscosity and filter.

[0097] Experimental Examples

[0098] The waterborne touch-up material without volatile organic compound (VOCs) emission has the following basic data detection indexes:

[0099] Table 1-1

[0100] Performance evaluation method and procedure of the waterborne touch-up material

[0101] The touch-up material for waterborne wood coating of the present application can be applied to transparent effect coating touch-up of different substrates and different process links. The samples of the above examples and control examples are evaluated for touch-up performance. The waterborne touch-up tests are all carried out on black walnut plates of 20 cm x 30 cm x 2 cm of solvent-based polyurethane base material and photocuring base material, and waterborne single-component base material. The performance on the solvent-based polyurethane base material is evaluated in particular. The specific operation method is as follows: manual spraying is carried out according to Table 1-1. The color development after wet film, hole entry, defoaming, odor removal, film formation are evaluated respectively. After overnight, waterborne single-component three-part light material is sprayed to evaluate the permeability, adhesion and dry film effect of the dry film. The aging resistance after 7 days of self-drying at room temperature is evaluated. The volatile organic compounds (VOCs) of the waterborne touch-up material of different examples are determined. The evaluation results are shown in Table 1-2.

[0102] Color development: 5 levels for uniform color development without blooming, 0 level for blooming, and 5 levels in sequence;

[0103] Hole entry: 5 levels for uniform hole without edge shrinkage, 0 level for bloated edge shrinkage, and 5 levels in sequence;

[0104] Defoaming: 5 levels for clean wet film without bubbles, 0 level for obvious bubbles without elimination, and 5 levels in sequence;

[0105] Odor removal: 5 levels for no odor, 0 level for irritating odor, and 5 levels in sequence;

[0106] Film formation: 4℃ wet film thickness of 300um without cracking is the best;

[0107] Permeability: 5 levels for natural permeability, 0 level for white haze, and 5 levels in sequence;

[0108] Adhesion: 5 groups of intersecting grids with a distance of about 1m are drawn with a graver. Transparent tape is pasted on the gravered surface and pressed flat. Then the tape is torn off. The color material falling off in the grid is evaluated from 0 to 5 levels in sequence;

[0109] Aging resistance: The aging resistance △E data is recorded according to GB / T 23999-2009. The smaller the value, the better the performance;

[0110] Volatile organic compounds (VOCs): calculated and measured according to 10.4 of GB / T 23986-2009 in GB 18581-2020;

[0111] Table 1-2

[0112] Referring to Table 1-2, it can be seen that the water-based color correction material without volatile organic compound (VOCs) emission according to the present application has excellent hole construction property and defoaming property, and has excellent film forming property, adhesion to different types of substrates, and dry film effect meeting the actual application requirements, and the aging resistance index is far superior to the national standard without adding organic solvents artificially.

[0113] The above description is only preferred embodiments of the present application, and it should be understood that the present application is not limited to the forms disclosed herein, and should not be considered as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concepts described herein by the above teachings or related art or knowledge. Any modification and change made by those skilled in the art without departing from the spirit and scope of the present application shall be within the protection scope of the claims of the present application.

Claims

1. A volatile organic compound-free water-based color correction material, characterized by, Prepared from the following weight parts of raw materials: Water-based acrylic emulsion 40-50 parts Water-based polyurethane dispersion 25-35 parts Wetting and leveling agent 0.25-0.75 parts Wetting dispersant 1-2 parts Defoaming agent 0.2-0.4 parts Thickening agent 0.5-2 parts PH regulator 0.1-0.2 parts Deionized water 10-20 parts The preparation method of the water-based acrylic emulsion is: methyl methacrylate as monomer, using room temperature self-crosslinking reference diacetone acrylamide and oxalic acid diamide to synthesize, the mass ratio of methyl methacrylate, diacetone acrylamide and oxalic acid diamide is 1:1:1; The preparation method of the water-based polyurethane dispersion is: using melt process dispersion method, hexamethylene diisocyanate is used as prepolymer and polytetrahydrofuran diol-2000 is synthesized, the mass ratio of hexamethylene diisocyanate and polytetrahydrofuran diol-2000 is 1.5:1; The wetting dispersant does not contain solvent and ethoxylated nonyl phenol anion, nonionic and multifunctional type.

2. The VOC-free aqueous refinish material of claim 1, wherein, The weight percentage content is: Water-based acrylic emulsion 40 parts Water-based polyurethane dispersion 35 parts Wetting and leveling agent 0.5 parts Wetting dispersant 1 part Defoaming agent 0.3 parts Thickening agent 1.5 parts PH regulator 0.1 part Deionized water 18.6 parts.

3. The VOC-free aqueous retouching material according to claim 1 or 2, characterized in that, The wetting and leveling agent is a polyether siloxane wetting and leveling agent without solvent.

4. The VOC-free aqueous retouching material according to claim 1 or 2, characterized in that, The defoaming agent is a silicone and / or organic modified polysiloxane emulsion.

5. The VOC-free aqueous retouching material according to claim 1 or 2, characterized in that, The thickening agent is an aqueous associated thickening agent of acrylic and polyurethane type.

6. The VOC-free aqueous retouching material according to claim 1 or 2, characterized in that, The PH regulator is an organic acid-base buffer.

7. The VOC-free aqueous retouching material according to claim 1 or 2, wherein, The deionized water is filtered water with TDS less than 100 PPM.

8. A process for the preparation of a VOC-free aqueous retouching material according to any one of claims 1 to 7, characterized in that, Including the following steps: (1) Put the water-based acrylic emulsion and water-based polyurethane dispersion into the container tank; mix part of the water with the PH regulator, then slowly pour into the container tank, and mix at medium speed 500-800 r / min for 2 minutes until uniform; wherein the part of the water accounts for 1 / 10-1 / 9 of the total water amount; (2) Slowly pour the thickening agent, wetting and leveling agent, wetting dispersant and defoaming agent into the container tank under medium speed 500-800 r / min stirring for 2 minutes until uniform; (3) Stir at high speed 800-1000 r / min for 30 minutes, add the remaining water, filter, detect and package.

9. The application of a water-based color correction material without volatile organic compounds for wood paint according to any one of claims 1-7.

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