CN112280417A

CN112280417A - Water-based wood paint

Info

Publication number: CN112280417A
Application number: CN202011256619.0A
Authority: CN
Inventors: 隋军; 董岩
Original assignee: Shenyang Meishi Chemical Co ltd
Current assignee: Shenyang Meishi Chemical Co ltd
Priority date: 2020-11-11
Filing date: 2020-11-11
Publication date: 2021-01-29

Abstract

The invention belongs to the field of water-based paint, and particularly relates to water-based wood paint. The water-based wood paint comprises the following raw materials: acrylic polymer emulsion, film forming auxiliary agent, foam inhibitor and/or defoaming agent, leveling agent, wetting agent, essence, dispersing agent, rheological auxiliary agent and/or thickening agent, preservative, filler, pH regulator, wax emulsion and/or wax powder, special additive and deionized water. The aqueous wood lacquer disclosed by the invention is good in adhesive force, can not deepen the color of wood, solves the problem of soft hardness of a lacquer film, has a pencil rule test result of H, is good in comprehensive performance and is convenient to construct.

Description

Water-based wood paint

Technical Field

The invention belongs to the field of water-based paint, and particularly relates to water-based wood paint.

Background

Aqueous paints are paints in which water is used as a diluent. The water paint includes 3 kinds of water soluble paint, water thinned paint and water dispersed paint. The water-soluble paint is a film-forming material represented by a water-soluble resin, polyvinyl alcohol and various modified materials thereof, and in addition, a water-soluble alkyd resin, a water-soluble epoxy resin, an inorganic polymer water-based resin and the like. With the development of economy, the improvement of environmental awareness and the improvement of the water-based wood paint technology, the water-based wood paint has become a development trend, but has some defects. Firstly, the drying of the water-based wood coating is greatly influenced by weather and particularly humidity, and many manufacturers of water-based wood children home use original oil-based home coating equipment. The environmental protection is the trend of the world at present, enterprises can not exception, the enterprises of the water-based wood lacquer obviously have the unique inherent advantage, the water-based wood lacquer can be developed at a higher speed, and the structure and the quality of the product can be changed along with the market demand. The toy for children is applied, China is a producing country of the toys in the world, large-scale toy production enterprises have many families, and the toys in the world are manufactured, wherein the Guangdong accounts for more than half of the sales of the toys in China, and with the development of the economy in China, the toy expenditure is increased in the consumption expenditure of residents in cities and countryside in China. If the Chinese toy consumption reaches the average level of Asia, it can be seen that the toy market has great potential. Children like colorful toys, but the more colorful toys contain relatively more heavy metal components. The national promulgated and implemented the standard of 'the limit of harmful substances in paint for toys', and established a strict upper limit for the content of the harmful substances in the paint for toys, and required to be marked in the description of the toys. With the further idea of environmental protection, the wooden toy paint has developed the requirement of water-based paint. Decoration applications many parents are busy decorating new homes and rooms for babies, and environmental pollution and safety problems of children's rooms are the first to be noticed and solved. Various decorative materials on the market can release some harmful gases, and even the materials meet the limited standards of harmful substances of national interior decoration materials, the situation that the harmful substances in the indoor air exceed the standard can be caused in a certain amount of indoor space. Therefore, the bearing capacity of the material of the house space is considered in terms of the material paved on the ground, the wall surface is painted or wallpaper, the size of the furniture, the selected material and the like, and the decorative material which is simple is used as far as possible when the child house is decorated. Especially, furniture paint in children's rooms is a main source of benzene pollution in indoor air, and the problem of benzene pollution is caused.

The development obstacles of the water paint are mainly the following:

habitual factors: workers using traditional paint suspect attitude to water-based paint, have exclusion psychology, immature construction process, hinder the popularization of water-based paint, because the market promotion resistance is greater, some enterprises continue to be weak under the condition of bad income in the early stage, the woodenware paint market in China is very likely to have a long-term pull-saw type rigid stage of water-based paint and oily paint;

performance factors: compared with the traditional paint, the water-based paint has gap in the aspects of fullness, hardness, wear resistance, hand feeling and the like of a paint film, and although the market share of the water-based wood paint is expanding, the application of the water-based wood paint to high-grade furniture is limited;

price factor: the price of a single pot of the common water-based wood paint is higher than that of the traditional paint, for example, the domestic cheap water-based paint needs 30 yuan kilograms, and the imported product is mostly priced about 100 yuan kilograms and is almost 2-5 times of the oil paint. The price of the water-based paint is high for a long time, so that the water-based paint is difficult to be accepted by consumers in a short time, and the market popularization speed is extremely low;

brand factors: the large brands of the wood lacquer on the market are well done in the aspect of traditional paint, stable channels and users exist, the water-based wood lacquer is not willing to be popularized, the market is not in call of the large brands, and the popularization strength of the water-based wood lacquer in China is not enough. The water paint is pressed by a large brand of oil paint, so that the accumulated residual force is still needed for impacting the market to get rid of fries;

policy factors: at present, although the country advocates the use of environment-friendly and healthy coatings, no order forbids the production of solvent-based wood coatings, and no rigid regulation requires the use of water-based wood coatings, which leaves a space for long-term survival for oil paint.

Although the waterborne wood coating is recognized as an environment-friendly coating, the waterborne wood coating has a plurality of problems. The main problems of the water-based wood coating are pollution to water quality during construction and production, poor physical and chemical properties of a coating, imperfect coating construction matching system, high price and the like. The combination properties are far from the same as solvent-based coatings.

The aqueous wood lacquer using acrylic acid as the main component is mainly characterized by good adhesive force, no deepening of the color of wood ware, poor wear resistance and chemical resistance, soft hardness of lacquer film, HB as the test of pencil rule, poor fullness, general comprehensive performance and easy generation of defects during construction.

Disclosure of Invention

The invention aims to solve the problems that the paint film hardness of the single-component acrylic acid single emulsion component wood lacquer is soft, the pencil rule is HB, the comprehensive performance is general, the construction is easy to generate defects and the like.

In order to achieve the purpose, the invention provides water-based wood paint which comprises the following raw materials:

70-89 wt% of acrylic polymer emulsion, 1-10 wt% of film forming additive, 0.2-0.8 wt% of foam inhibitor and/or defoaming agent, 0.2-0.5 wt% of flatting agent, 0.2-0.5 wt% of wetting agent, 0-0.02 wt% of essence, 0.3-2 wt% of dispersing agent, 0.1-1 wt% of rheological additive and/or thickening agent, 0-0.1 wt% of preservative, 1-5 wt% of filler, 0-0.06 wt% of pH regulator, 1-5 wt% of wax emulsion and/or wax powder, 0.1-2 wt% of special additive, 2-15 wt% of deionized water and more than or equal to 0 wt% of coloring agent;

the acrylic polymer emulsion comprises self-crosslinking acrylic copolymer dispersion polymer emulsion and self-crosslinking core-shell structure acrylic polymer emulsion;

the special additive comprises at least two of a hardening agent, a delustering agent, an anti-scratch agent, a slip agent, an anti-blocking agent, a cross-linking agent and an ultraviolet absorbent.

As a preferred scheme, the raw material composition of the water-based wood paint comprises:

75-85 wt% of acrylic polymer emulsion, 4-7 wt% of film forming additive, 0.4-0.6 wt% of foam inhibitor and/or defoaming agent, 0.3-0.4 wt% of flatting agent, 0.3-0.4 wt% of wetting agent, 0.05-0.15 wt% of essence, 1-1.5 wt% of dispersing agent, 0.4-0.7 wt% of rheological additive and/or thickening agent, 0.04-0.07 wt% of preservative, 2-4 wt% of filler, 0.04-0.06 wt% of pH regulator, 2-4 wt% of wax emulsion and/or wax powder, 0.5-1.6 wt% of special additive, 4-12 wt% of deionized water and more than or equal to 2 wt% of colorant.

Preferably, the self-crosslinking acrylic copolymer dispersion polymer emulsion comprises at least one of an imperial acrylic polymer emulsion, such as DSM XK-14, and an European acrylic polymer emulsion, such as ALBERDINGK RESINS AC 3660.

Preferably, the self-crosslinking core-shell acrylic polymer emulsion comprises a novel acrylic polymer emulsion, such as Setaqua 6756.

The acrylic polymer emulsion determines the main performance of the paint film, and the compounding of the self-crosslinking acrylic dispersion polymer emulsion and the self-crosslinking core-shell structure acrylic polymer emulsion not only makes up the defect of single acrylic paint, but also better improves the performance of the paint film.

Preferably, the mass ratio of the self-crosslinking acrylic copolymer dispersion polymer emulsion to the self-crosslinking core-shell structure acrylic polymer emulsion is 1: 1.5-2.5.

Preferably, the film-forming aid is a film-forming aid DPM and/or a film-forming aid DPNB. After the film-forming assistant is volatilized, the emulsion or dispersion particles form a uniform and compact film, and the film-forming property under the low-temperature condition can be improved.

Preferably, the foam inhibitor is a BYK foam inhibitor, and the defoaming agent is a TEGO di high defoaming agent. The generated bubbles can escape from the liquid surface and be broken.

Preferably, the leveling agent is a BYK leveling agent and/or a TEGO high leveling agent. The construction performance of the paint is obviously improved, and a flat, smooth and clean coating can be formed.

Preferably, the wetting agent is a BYK wetting agent and/or a TEGO wetting agent. The wetting agent improves the wettability of the paint liquid to the substrate, improves the leveling property and can increase the adhesive force of the paint film to the substrate.

Preferably, the dispersant is a BYK dispersant and/or a TEGO high dispersant, and can promote the dispersion of the pigment and filler in the paint liquid.

Preferably, the rheological additive is a Ming rheological additive, and the thickener is an OMG thickener. Provides good fluidity and leveling property to the paint and reduces the defects in the emulsion process.

Preferably, the preservative is Sol THOR. The preservative prevents the paint liquid from mildewing in the storage process.

Preferably, the filler comprises at least one of a grinding powder, a matting powder and bentonite. The polishing powder improves the polishing performance of the product, and the addition of the matting powder adjusts the gloss of a paint film and influences the aesthetic feeling of an individual.

Preferably, the pH regulator comprises at least one of ammonia water, 2-amino-2-methyl-1-propanol and dimethylethanolamine. The pH regulator regulates the pH value of the paint liquid to stabilize the paint liquid. In the present invention, the pH of the product is usually adjusted to 8.3 to 8.8.

Preferably, the wax emulsion is a Pulsatilla wax emulsion, such as Pulsatilla 2000 series wax emulsions; the wax powder is Hanwei chemical wax powder.

The coloring agent gives the aqueous paint a desired color, and includes two broad classes, a pigment for solid paint (finish without wood grain exposure) and a dye for clear paint (finish with wood grain exposure). Preferably, the colorant is a coloring agent of the brand name of Golomb chemical, Craine, DuPont, Meili, etc.

According to the invention, corresponding auxiliary agents such as a hardening agent (for improving the hardness of a paint film), a flatting agent (for reducing the gloss of the paint film), an anti-scratch agent, a slip agent (for improving the hand feeling of the paint film), an anti-adhesion agent (for preventing the coating from being laminated and adhered), a cross-linking agent (for preparing 1.5K paint, for improving the comprehensive performance), an ultraviolet absorbent (for outdoor anti-aging, for yellowing after placement) and the like can be selectively added according to the special requirements of the water-based paint.

In a specific embodiment, the preparation method of the aqueous wood lacquer comprises the following steps:

1. mixing a first portion of the film-forming aid with a first portion of deionized water to obtain a first mixture, and mixing the filler with a second portion of the deionized water to obtain a second mixture; the first part of the acrylic polymer emulsion, the first mixture and the second mixture are fed into a clean drawing cylinder or a clean container and stirred uniformly for half an hour to 1 hour.

2. A dispersed feeding process: the dispersed feeding process is a key process for the quality of the coating product. And (3) operating by using operating equipment, sequentially adding the feeding sequence and quantity of the raw materials of each component in the formula and adjusting the speed and time of the high-speed dispersion machine.

The method comprises the following steps: adding a dispersing agent, dispersing for 10 minutes at a low speed (400 revolutions per minute), then adding a wax emulsion and a special additive of powder (when the special additive of the powder needs to be added, the powder needs to be slowly added to prevent the powder from caking and not dispersing well, a dispersion time tester uses a scraper fineness meter to test the fineness of the material to be less than 20 um), dispersing for 25 minutes at a high speed (1200 revolutions per minute), sequentially adding a foam inhibitor and/or a defoaming agent, a wetting agent and a leveling agent, dispersing for 20 minutes at a high speed (1200 revolutions per minute), and then adding a second part of acrylic polymer emulsion to continue dispersing.

3. Preparing paint: after the dispersion process is finished, a paint preparation process is carried out, wherein the process mainly adjusts the viscosity and the appearance state (including the part needing color adjustment) of the product.

The method comprises the following steps: adding rheological aid and/or thickener, second part of film forming aid, third part of deionized water, optionally adding liquid special additive, optionally adding essence, optionally adding antiseptic, optionally adding colorant, optionally adding pH regulator until pH of the system is 8.3-8.8.

4. After the test (using a rotary viscometer), when the viscosity reaches the required 1000-1500 cps in the index range, the material can be discharged, the process time is controlled within 30-60 minutes, and the fineness viscosity is in accordance with the requirement, thus the preparation is finished.

The technical scheme of the invention has the following beneficial effects:

according to the invention, the self-crosslinking acrylic acid dispersion polymer emulsion and the self-crosslinking core-shell structure acrylic acid polymer emulsion are compounded to serve as the acrylic acid polymer emulsion, so that the obtained water-based wood lacquer has good adhesive force, can not deepen the color of wood, solves the problem of soft hardness of a lacquer film, has a pencil rule test result of H, and is good in comprehensive performance and convenient to construct.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

Fig. 1 shows a real shot of the aqueous wood lacquer obtained according to an embodiment of the present invention.

Figure 2 illustrates a scratch pattern generated during testing of one embodiment of the present invention.

FIG. 3 shows a chart of vinegar resistance test for a product according to an embodiment of the present invention.

FIG. 4 shows a product adhesion test chart of one embodiment of the present invention.

Detailed Description

Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

In the embodiment of the invention, the preparation method of the water-based wood paint comprises the following steps:

1. mixing half of the film-forming aid DPM with a first part of deionized water to obtain a first mixture, and mixing bentonite with a second part of deionized water to obtain a second mixture; half of the acrylic polymer emulsion, the first mixture, and the second mixture were charged into a clean vessel and stirred uniformly for 1 hour.

2. Adding a TEGO (ethylene diamine tetra-methyl) high-dispersing agent, dispersing for 10 minutes at a low speed (400 rpm), then adding a Pockel wax emulsion and a flatting agent of powder, slowly adding the powder to prevent the powder from caking and not dispersing well, detecting the fineness of the material by a dispersion time detector by using a scraper gauge to be below 20um, dispersing for 25 minutes at a high speed (1200 rpm), sequentially adding an antifoaming agent, a BYK wetting agent and a BYK flatting agent, dispersing for 20 minutes at a high speed (1200 rpm), and then adding the rest acrylic polymer emulsion to continue dispersing.

3. Adding the diluent rheological additive, the rest film-forming additive and the third part of deionized water, adding the liquid slipping agent, essence, preservative and colorant, and adding ammonia water to adjust the pH value of the system to 8.5.

In the examples of the invention, the acrylic polymer emulsion is a mixture of Setaqua6756 acrylic polymer emulsion and DSM XK-14 acrylic polymer emulsion in a weight ratio of 2: 1; the film forming assistant is DPM, the leveling agent is a BYK leveling agent, the wetting agent is a BYK wetting agent, the dispersing agent is a TEGO high dispersing agent, the rheological assistant is a Ming and Ling rheological assistant, the preservative is Sol THOR, the filler is bentonite, the pH regulator is ammonia water, and the wax emulsion is Wengkeel 2000 series wax emulsion.

Example 1

This embodiment provides an aqueous wood lacquer, and this aqueous wood lacquer's raw materials composition includes:

76.09 wt% of acrylic polymer emulsion, 5.5 wt% of film-forming assistant, 0.5 wt% of defoaming agent, 0.35 wt% of flatting agent, 0.35 wt% of wetting agent, 0.01 wt% of essence, 1.1 wt% of dispersing agent, 0.5 wt% of rheological assistant, 0.05 wt% of preservative, 3 wt% of filler, 0.05 wt% of pH regulator, 3 wt% of wax emulsion, 1 wt% of special additive (0.5 wt% of delustering agent, 0.5 wt% of slipping agent) and 8.5 wt% of deionized water.

The real shot of the obtained waterborne wood lacquer is shown in figure 1.

Test example 1

The hardness test of the aqueous wood lacquer prepared in example 1 is carried out according to GB/T6739 in GB/T23999-2009, the pencil is a Chinese brand 101 drawing pencil, and the scratch pattern generated in the test process is shown in figure 2.

Test example 2

The scratch resistance of the aqueous wood lacquer prepared in example 1 is tested according to GB/T9279 in GB/T23999-2009, and the result is observed visually at 45 degrees, and no scratch is judged to be 'no scratch'.

Test example 3

The water resistance test of the waterborne wood lacquer prepared in the example 1 is carried out according to the standard GB/T4893.1-2005, after 24h, the test plate has no paint film ill phenomenon such as foaming, cracking, peeling and the like, has no slight color change and slight gloss change, and has no paint film ill phenomenon after 20min of boiling water resistance test.

Test example 4

The water-based wood paint prepared in the embodiment 1 is subjected to a freeze-thaw resistance test, and is repeatedly carried out for 3 times according to the specification of 5.5 in GB/T9755-2014, and the product is uniform without hard lumps, deterioration and abnormity after being stirred.

Test example 5

The stain resistance test was performed on the aqueous wood lacquer prepared in example 1, wherein the vinegar resistance and the tea resistance were both good, and the lacquer film was not diseased. The vinegar resistance test is shown in fig. 3.

Test example 6

The adhesion test of the waterborne wood lacquer prepared in example 1 was performed with a cross-cut tester, and no peeling-off occurred, and the test pattern is shown in fig. 4.

Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. The water-based wood paint is characterized by comprising the following raw materials:

2. The aqueous wood lacquer according to claim 1, wherein the raw material composition of the aqueous wood lacquer comprises:

3. The aqueous wood lacquer according to claim 1 or 2, wherein,

the self-crosslinking acrylic dispersion polymer emulsion comprises at least one of an imperial acrylic polymer emulsion and an European acrylic polymer emulsion;

the self-crosslinking acrylic polymer emulsion with a core-shell structure comprises a novel acrylic polymer emulsion.

4. The aqueous wood lacquer according to claim 1 or 2, wherein the mass ratio of the self-crosslinking acrylic dispersion polymer emulsion to the self-crosslinking core-shell acrylic polymer emulsion is 1: 1.5-2.5.

5. The aqueous wood lacquer according to claim 1 or 2, wherein the film forming aid is a film forming aid DPM and/or a film forming aid DPNB.

6. The aqueous wood lacquer according to claim 1 or 2, wherein,

the foam inhibitor is a BYK foam inhibitor, and the defoaming agent is a TEGO di high defoaming agent;

the leveling agent is a BYK leveling agent and/or a TEGO high leveling agent;

the wetting agent is a BYK wetting agent and/or a TEGO high wetting agent;

the dispersant is a BYK dispersant and/or a TEGO di high dispersant.

7. The aqueous wood lacquer according to claim 1 or 2, wherein the rheological aid is a Ming rheological aid and the thickener is an OMG thickener.

8. The aqueous wood lacquer according to claim 1 or 2, wherein the preservative is Sol THOR.

9. The aqueous wood lacquer according to claim 1 or 2, wherein,

the filler comprises at least one of grinding powder, matting powder and bentonite;

the pH regulator comprises at least one of ammonia water, 2-amino-2-methyl-1-propanol and dimethylethanolamine.

10. The aqueous wood lacquer according to claim 1 or 2, wherein the wax emulsion is a Pulsatilla wax emulsion, and the wax powder is a Hanwei chemical wax powder.