CN113980516A - Water-based white color modifier and preparation method thereof - Google Patents

Abstract

The invention discloses a water-based white color modifier and a preparation method thereof, wherein the water-based white color modifier comprises the following raw materials in parts by weight: 25-35% of waterborne acrylic resin, 10-20% of titanium dioxide, 0.3-0.8% of modified urea solution, 3-5% of butyl cellosolve and 20-30% of ethanol, wherein the waterborne acrylic resin is neutralized by ammonia and can be crosslinked with itself at a temperature, and the solid content is 40%. The water-based white color modifier has the advantages of quick drying, low odor, stable storage, infinite dilution and high gloss, has excellent adhesive force with a primer layer, and simultaneously has good application property, recoatability and polishability, and meets the requirements of the aspects of customized furniture and the like for semi-transparent coating application.

Description

Water-based white color modifier and preparation method thereof

Technical Field

The invention belongs to the field of wood coatings, and particularly relates to a water-based white color modifier and a preparation method thereof.

Background

With the vigorous popularization of the water-based paint and the gradual application of the water-based paint in the market by the national environmental protection policy, the requirement on the coating effect of the water-based paint is higher and higher. In recent years, with the dominance of consumers of furniture after 90 days, the painting style of the furniture is more and more modernized, younger and more fashionable, so the semi-permeable effect painting is produced at the same time and becomes the wind vane for painting in the furniture industry.

At present, furniture semi-transparent coating is prepared by adding color paste into traditional glaze and color repairing essential oil when in use, the prepared solvent type color repairing agent generally has the problems of unstable storage, easy precipitation and agglomeration, non-uniform color effect, big smell, even uneven color repairing, cracking and the like, and the compatibility of resin in the solvent type color repairing agent and other additives is poor, thereby influencing the use effect. When the conventional water-based color modifier is used for semi-permeable coating, in order to make the water-based color modifier quick-dry, a large amount of quick-drying solvents with larger polarity, such as ethanol, are required to be added when the conventional water-based color modifier is prepared, so that the waste and pollution of the solvents are caused, for example, CN107805437A discloses a water-based wood paint for color modification and a preparation method thereof, wherein 45-65 wt% of ethanol is added when the water-based wood paint is prepared; CN111205710A discloses a quick-drying type water-based color modifier and a preparation method thereof, wherein more than 89% of ethanol is required to be added for obtaining the water-based color modifier with better performance. In addition, when the conventional aqueous color modifier is prepared, the titanium dioxide is added to easily coarsen and form particles, and the pigment particles in the aqueous color modifier are required to be continuously stirred to be kept from precipitating and agglomerating. Therefore, the market is urgently in need of researching and developing the water-based white color modifier which is matched with the semi-permeable effect, has low smell, even no smell, is stable in storage and can be infinitely diluted.

Disclosure of Invention

In view of the above-mentioned deficiencies in the prior art, the present invention provides an aqueous white color modifier; the water-based white color modifier has the advantages of quick drying, low odor, stable storage, infinite dilution and high gloss, the using amount of ethanol is small, the water-based white color modifier has excellent adhesive force with a primer layer, and simultaneously has good application property, recoatability and polishability, and the water-based white color modifier meets the requirements of the aspects of customized furniture and the like for semi-transparent coating application.

The invention aims to provide a water-based white color modifier, which comprises the following raw materials in parts by weight:

the waterborne acrylic resin is crosslinked with ammonia in a certain temperature, and the solid content is 40%.

The water-based acrylic resin selected by the scheme is used as a main film forming substance, has small molecular weight, good compatibility with water and ethanol, high tolerance to ethanol, self-crosslinking, strong wetting and wrapping property, good water resistance and high glossiness of the titanium dioxide pigment in the water-based white color modifier during crosslinking, and can wrap the titanium dioxide pigment in the water-based white color modifier; the rutile titanium dioxide is coating-grade titanium dioxide produced by a chlorination method, and has the advantages of easy dispersibility, high covering power, high glossiness, weather resistance and the like; however, the color modifier prepared by mixing the water-based acrylic resin and the rutile type titanium dioxide often has the problems of coarsening, granulation and precipitation of the titanium dioxide, and based on the problems, the modified urea solution, the ethylene glycol monobutyl ether and the ethanol are added in the invention. The selected modified urea solution has good anti-settling performance, and can prevent the titanium pigment from settling, and the color modifier from soft settling or hard settling and the like in the long-term storage and dilution construction process of the color modifier; by adopting the special proportion of ethylene glycol butyl ether and ethanol, the drying speed of the color modifier is adjusted to form a volatilization gradient, thereby solving the problems that the conventional aqueous emulsion or dispersion has low tolerance to ethanol and is easy to generate titanium dioxide particles and precipitate; and in the practical color-fixing application process, ethanol can be adopted for dilution and use according to the sample effect requirement, and the precipitate is not generated after long-time standing and storage. The method has the advantages of simple production process, economy and reasonability, no need of adding or changing original production equipment, suitability for industrial mass production, quick drying, low odor, storage stability, infinite dilution, high gloss, excellent adhesive force with a primer layer, good construction property, recoatability, polishability, suitability for reciprocating automatic coating and the like, and can meet the high requirements of customers.

Further, the water-based white color modifier also comprises 0.2 to 0.5 weight percent of water-based wetting agent, 0.1 to 0.5 weight percent of water-based defoaming agent, 2 to 3 weight percent of water-based dispersing agent, 0.5 to 1.5 weight percent of pH regulator and 15 to 30 weight percent of water.

Further, the titanium dioxide is rutile type titanium dioxide.

Further, the aqueous wetting agent is a polysiloxane-polyether copolymer. The wetting spreading performance of the coating can be effectively improved by the aqueous wetting agent selected by the scheme, the wetting effect of the color repairing agent is improved, in addition, the selected polysiloxane-polyether copolymer and the modified polysiloxane are similar in structure, the defoaming effect and the wetting performance can be mutually improved, and the prepared aqueous white color repairing agent has good anti-shrinkage performance and recoatability.

Further, the aqueous defoaming agent is modified polysiloxane. The water-based defoaming agent adopted by the scheme has good compatibility with other components in a system and large Si-O bond energy, and the addition of the modified polysiloxane can enhance the adhesive force of the color modifier, has good defoaming effect and prevents defects when the color modifier forms a coating.

Further, the aqueous dispersant is a copolymer aqueous solution containing high pigment affinity groups.

Further, the pH regulator is dimethylethanolamine.

Preferably, the aqueous acrylic resin is selected from the group consisting of the aqueous acrylic resin having the designation 1140 of the changxing chemical.

Preferably, the modified urea solution is selected from one of BYK-420 and BYK-E420.

Preferably, the ethylene glycol butyl ether is selected from commercially available technical grade ethylene glycol butyl ethers.

Preferably, the ethanol is selected from commercially available technical grade absolute ethanol.

Preferably, the aqueous wetting agent is selected from one of Tego-4100, AFCONA-3588.

Preferably, the aqueous defoaming agent is a defoaming substance with a special molecular structure

Defoaming agents synthesized with polysiloxanes selected from

A36、

A 34.

Preferably, the aqueous dispersant is selected from

Dispers 750W。

Preferably, the rutile titanium dioxide is selected from BLR-895.

Another object of the present invention is to provide a method for preparing an aqueous white color modifier, comprising the steps of:

step 1, mixing and dispersing water-based acrylic resin, a pH regulator and water;

step 2, adding a water-based dispersing agent, a modified urea solution, a water-based wetting agent, a water-based defoaming agent and ethylene glycol monobutyl ether under continuous stirring for dispersing;

step 3, adding titanium dioxide, fully dispersing, adding ethanol and stirring;

and 4, filtering, discharging and packaging.

Further, in step 3, the titanium dioxide is dispersed to the fineness of below 20 um.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not a whole embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment provides an aqueous white color modifier and a preparation method thereof.

(1) Composition of aqueous white color modifier.

TABLE 1 parts by weight composition of aqueous white color modifier of examples 1-3 and comparative examples 1-3.

(2) Examples 1-3 and comparative examples 1-2 preparation of aqueous white color modifiers.

Step 1, putting aqueous acrylic resin with the trade name of 1140 of Changxing chemical into a dispersion kettle according to parts by weight, sequentially adding dimethylethanolamine and water under the stirring state of 600r/min, and dispersing for 5-10min at 600r/min after the addition is finished;

step 2, adding the mixture in turn under the stirring state

Dispers 750W、BYK-420、Tego-4100、

A36 and ethylene glycol monobutyl ether, dispersing for 5-10min at 800r/min after the addition;

step 3, adding BLR-895 under the stirring state of 800r/min, fully dispersing for 15-20 minutes at 1200r/min until the fineness of BLR-895 is below 20um, and finally adding commercial industrial grade absolute ethyl alcohol and stirring for 5 minutes until the viscosity is stable;

and 4, filtering, discharging and packaging.

(3) Comparative example 3 preparation of aqueous white color modifier.

The procedure is the same as in example 2 except that butyl cellosolve is not added.

And (5) testing the performance.

The prepared water-based white color modifier is sprayed on a UV primer plate for color modification to obtain a coating, performance test is carried out according to the GB/T23999-.

TABLE 2 results of the physical property test of the coating films obtained from the aqueous white color modifiers of examples 1 to 3 and comparative examples 1 to 3.

As shown in Table 2, the water-based white color modifier prepared in examples 1-3 has good surface effect, good water resistance, uniform gloss, good adhesion and the like when sprayed and modified on a UV primer plate. In the aqueous white color modifier prepared in the comparative example 1, the content of ethylene glycol monobutyl ether is too high, the content of ethanol is too low, a good volatilization gradient cannot be formed, the problems of coarseness, particle formation, precipitation and the like of titanium dioxide are easily caused, and the obtained aqueous white color modifier has low adhesive force and poor paint film effect. In the aqueous white color modifier prepared in the comparative example 2, the content of the modified urea solution is low, the anti-settling performance is poor, and the phenomena of settling of titanium dioxide, soft settling or hard settling of the color modifier and the like occur in the long-term storage and dilution construction process of the color modifier. The aqueous white color modifier prepared in the comparative example 3 does not contain ethylene glycol monobutyl ether, can not form good volatilization gradient, is easy to generate the problems of coarse particles, precipitation and the like of titanium white powder, and has low adhesive force and poor paint film effect.

And (3) comparison test:

the aqueous white color modifier prepared in example 2 of the present invention and the aqueous white color modifier prepared in comparative example 3 were compared with the conventional color modification process operation in the market, and the results are shown in table 3.

Table 3. comparison of the operation and effect of the aqueous white color modifier prepared in example 2 with the existing color modifying process.

As can be seen from tables 2 and 3, compared with the existing color correction process, the water-based white color correction agent prepared by the invention has the advantages of high drying speed, simple and convenient construction and use, excellent standing anti-settling effect and excellent coating effect, can be recoated with various finish paints after being dried for 0.5 hour, has the overall performance meeting the application requirements of the end market, and particularly meets the application of the coating effect of the current light and luxury semi-transparent process.

Finally, it should be noted that the above-mentioned embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the modifications and equivalents of the specific embodiments of the present invention can be made by those skilled in the art after reading the present specification, but these modifications and variations do not depart from the scope of the claims of the present application.

Claims (9)

1. The water-based white color modifier is characterized by comprising the following raw materials in parts by weight:

the waterborne acrylic resin is crosslinked with ammonia in a certain temperature, and the solid content is 40%.

2. The aqueous white color modifier according to claim 1, further comprising 0.2-0.5% by weight of an aqueous wetting agent, 0.1-0.5% by weight of an aqueous defoaming agent, 2-3% by weight of an aqueous dispersing agent, 0.5-1.5% by weight of a pH regulator, and 15-30% by weight of water.

3. The aqueous white color modifier of claim 2, wherein the aqueous wetting agent is a polysiloxane-polyether copolymer.

4. The aqueous white color modifier of claim 2, wherein the aqueous defoamer is a modified polysiloxane.

5. The aqueous white color modifier of claim 2, wherein the aqueous dispersant is an aqueous solution of a copolymer containing high pigment affinity groups.

6. The aqueous white color modifier of claim 2, wherein the titanium dioxide is rutile titanium dioxide.

7. The aqueous white color modifier of claim 2, wherein the PH adjuster is dimethylethanolamine.

8. The preparation method of the water-based white color modifier is characterized by comprising the following steps:

step 1, mixing and dispersing water-based acrylic resin, a pH regulator and water;

step 2, adding a water-based dispersing agent, a modified urea solution, a water-based wetting agent, a water-based defoaming agent and ethylene glycol monobutyl ether under continuous stirring for dispersing;

step 3, adding titanium dioxide, fully dispersing, adding ethanol and stirring;

and 4, filtering, discharging and packaging.

9. The aqueous white color modifier of claim 8, wherein in step 3, the titanium dioxide is dispersed to a fineness of less than 20 um.