阅读说明：本技术 一种防护染色木皮及科技木皮变色的水性漆 (Water-based paint for preventing color change of dyed veneers and technical veneers ) 是由 张词典 于 2019-09-26 设计创作，主要内容包括：本发明公开了一种防护染色木皮及科技木皮变色的水性漆,按照重量份数计包括以下组分：水性丙烯酸树脂35-45份、水性聚氨酯树脂20-30份、消泡剂0.3-0.7份、基材润湿剂0.2-1份、二丙二醇丁醚2-5份、二丙二醇甲醚2-4份、醇酯十二1-3份、防霉剂0.5-1份、润湿剂0.3-0.6份、硅溶胶3-5份、硬脂酸锌1-4份、空心微珠0.5-1份、单宁酸抑制剂0.5-1份、胺中和剂0.1-0.5份、流平剂0.2-0.5份、抗氧剂0.2-0.4份、紫外线吸收剂0.4-0.8份、聚氨酯增粘剂0.2-0.5份、丙烯酸增粘剂0.3-0.8份、纳米二氧化钛0.5-1份、去离子水10-20份、光屏蔽剂0.5-1份、光稳定剂0.2-0.5份。(The invention discloses a water-based paint for preventing discoloration of dyed veneers and technical veneers, which comprises the following components in parts by weight: 35-45 parts of water-based acrylic resin, 20-30 parts of water-based polyurethane resin, 0.3-0.7 part of defoaming agent, 0.2-1 part of substrate wetting agent, 2-5 parts of dipropylene glycol butyl ether, 2-4 parts of dipropylene glycol methyl ether, 1-3 parts of alcohol ester, 0.5-1 part of mildew inhibitor, 0.3-0.6 part of wetting agent, 3-5 parts of silica sol, 1-4 parts of zinc stearate, 0.5-1 part of hollow microsphere, 0.5-1 part of tannic acid inhibitor, 0.1-0.5 part of amine neutralizer, 0.2-0.5 part of flatting agent, 0.2-0.4 part of antioxidant, 0.4-0.8 part of ultraviolet absorbent, 0.2-0.5 part of polyurethane tackifier, 0.3-0.8 part of acrylic tackifier, 0.5-1 part of nano titanium dioxide, 10-20 parts of deionized water, 0.5-1 part of light shielding agent, 0.2-0.8 part of light shielding agent, 0.2 to 0.5 portion of light stabilizer.)

1. The water-based paint for preventing the discoloration of dyed veneers and technical veneers is characterized by comprising the following components in parts by weight:

35-45 parts of water-based acrylic resin, 20-30 parts of water-based polyurethane resin, 0.3-0.7 part of defoaming agent, 0.2-1 part of substrate wetting agent, 2-5 parts of dipropylene glycol butyl ether, 2-4 parts of dipropylene glycol methyl ether, 1-3 parts of alcohol ester, 0.5-1 part of mildew inhibitor, 0.3-0.6 part of wetting agent, 3-5 parts of silica sol, 1-4 parts of zinc stearate, 0.5-1 part of hollow microsphere, 0.5-1 part of tannic acid inhibitor, 0.1-0.5 part of amine neutralizer, 0.2-0.5 part of flatting agent, 0.2-0.4 part of antioxidant, 0.4-0.8 part of ultraviolet absorbent, 0.2-0.5 part of polyurethane tackifier, 0.3-0.8 part of acrylic tackifier, 0.5-1 part of nano titanium dioxide, 10-20 parts of deionized water, 0.5-1 part of light shielding agent, 0.2-0.8 part of light shielding agent, 0.2 to 0.5 portion of light stabilizer.

2. The water-based paint for preventing the discoloration of dyed and technical veneers as claimed in claim 1, wherein the antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite, the ultraviolet absorber is 2- (2H-benzotriazole-2) -4, 6-bis (1-methyl-1-phenylethyl) phenol, and the light stabilizer is 2-hydroxy-4-n-octoxy benzophenone.

3. The water-based paint for preventing the color change of the dyed veneers and technical veneers as claimed in claim 1, wherein the light shielding agent is one or two of nano silicon dioxide and nano zinc oxide.

4. The water-based paint for preventing the color change of the dyed veneers and technical veneers as claimed in claim 3, wherein the mass ratio of the nano silicon dioxide to the nano zinc oxide in the light shielding agent is 1: 2.

5. The water-based paint for preventing the discoloration of dyed and technical veneers as claimed in claim 3, wherein the fineness of the nano-silica is less than 30nm, the fineness of the nano-zinc oxide is less than 30nm, the fineness of the silica sol is less than 20nm, and the fineness of the cenospheres is less than 40 nm.

6. The water-based paint for preventing the discoloration of the dyed and technical veneers as recited in claim 1, wherein the fineness of the water-based paint for preventing the discoloration of the dyed and technical veneers is less than 30 μm.

7. The preparation method of the water-based paint for preventing the discoloration of the dyed veneers and the technical veneers as claimed in claim 1, which is characterized by comprising the following steps:

step a, sequentially adding deionized water, dipropylene glycol butyl ether, dipropylene glycol methyl ether, alcohol ester twelve, a mildew preventive and a wetting agent into a charging basket, and then performing primary dispersion by using a high-speed dispersion machine, wherein the primary dispersion time is 10-30 minutes, and the dispersion speed of the primary dispersion is 500-800 revolutions per minute;

step b, adding the waterborne acrylic resin, the waterborne polyurethane resin and the defoaming agent into the charging basket, and then carrying out secondary dispersion by using a high-speed dispersion machine, wherein the time of the secondary dispersion is 15-25 minutes, and the dispersion speed of the secondary dispersion is 800-1000 revolutions per minute;

step c, adding a base material wetting agent into the charging bucket, and then carrying out third-time dispersion by using a high-speed dispersion machine, wherein the time of the third-time dispersion is 4-6 minutes, and the dispersion speed of the third-time dispersion is 500-800 revolutions per minute;

step d, sequentially adding zinc stearate, hollow microspheres and nano titanium dioxide into the charging basket, and then performing fourth dispersion by using a high-speed dispersion machine, wherein the fourth dispersion time is 15-20 minutes, and the dispersion speed of the fourth dispersion is 800-1000 revolutions per minute;

step e, adding a tannic acid inhibitor into the material barrel, and then carrying out fifth dispersion by a high-speed dispersion machine, wherein the time of the fifth dispersion is 4-6 minutes, and the dispersion speed of the fifth dispersion is 600-;

step f, adding an amine neutralizer into the charging basket to obtain a first mixture, and ensuring the pH of the first mixture to be 8-9;

step g, sequentially adding a leveling agent, silica sol, an antioxidant, an ultraviolet absorbent, a light shielding agent and a light stabilizer into a charging basket, and then carrying out sixth dispersion by using a high-speed dispersion machine, wherein the sixth dispersion time is 5 minutes, and the dispersion speed of the sixth dispersion is 1000 revolutions per minute;

step h, gradually adding a polyurethane tackifier and an acrylic tackifier into the charging basket to adjust the viscosity, so as to obtain a second mixture, and ensuring the viscosity of the second mixture to be 100S-110S;

and step i, filtering the second mixture to obtain a finished product.

8. The method for preparing the water paint for preventing the discoloration of the dyed and technical veneers as claimed in claim 7, wherein the step b is performed with a first additional dispersion, the dispersion time of the first additional dispersion is 5 minutes, the dispersion speed of the first additional dispersion is 1000 rpm, and the first additional dispersion is repeated for a plurality of times until the mixture in the cylinder does not have the shrinkage after the first additional dispersion.

9. The method for preparing the water-based paint for preventing the discoloration of the dyed and technical veneers as claimed in claim 7, wherein the step d is carried out and then a second additional dispersion is carried out, the dispersion time of the second additional dispersion is 5 minutes, the dispersion speed of the second additional dispersion is 1000 rpm, and the second additional dispersion is repeated for a plurality of times until the fineness of the mixture in the cylinder after the second additional dispersion is less than 30 μm.

10. The method for preparing the water paint for preventing the color change of the dyed and technical veneers as claimed in claim 7, wherein the second mixture in the step i is filtered through a 300-mesh filter screen.

Technical Field

The invention relates to the field of fine chemical engineering, in particular to a water-based paint for preventing color change of dyed veneers and technical veneers.

Background

The dyed veneer and the technical veneer are novel materials obtained by dyeing or synthesizing veneers through high technology, have natural textures of wood, have special texture and color effects, and are novel decorative materials. Is very popular with consumers.

However, the dyed veneer also has the problems of easy yellowing and easy discoloration. Because bleaching and dyeing are needed in the process of manufacturing the dyed veneer, under the sun and visible light irradiation, the bleaching agent and the dye are easy to generate structural and chemical changes, and chromophoric groups are easy to generate electronic transition, which easily causes the veneer to be yellowed and discolored. The existing water-based paint can not protect the dyed veneers and the technical veneers, and the dyed veneers and the technical veneers under the paint film still have the conditions of veneer yellowing and color change. Therefore, the water-based paint which protects the dyed veneers and the technical veneers by the paint film and ensures that the veneers are not easy to discolor is specially developed.

Disclosure of Invention

The invention aims to provide a water-based paint for preventing the discoloration of dyed veneers and technical veneers.

According to one aspect of the invention, the invention provides a water-based paint for preventing discoloration of dyed veneers and technical veneers, which comprises the following components in parts by weight:

35-45 parts of water-based acrylic resin, 20-30 parts of water-based polyurethane resin, 0.3-0.7 part of defoaming agent, 0.2-1 part of substrate wetting agent, 2-5 parts of dipropylene glycol butyl ether, 2-4 parts of dipropylene glycol methyl ether, 1-3 parts of alcohol ester, 0.5-1 part of mildew inhibitor, 0.3-0.6 part of wetting agent, 3-5 parts of silica sol, 1-4 parts of zinc stearate, 0.5-1 part of hollow microsphere, 0.5-1 part of tannic acid inhibitor, 0.1-0.5 part of amine neutralizer, 0.2-0.5 part of flatting agent, 0.2-0.4 part of antioxidant, 0.4-0.8 part of ultraviolet absorbent, 0.2-0.5 part of polyurethane tackifier, 0.3-0.8 part of acrylic tackifier, 0.5-1 part of nano titanium dioxide, 10-20 parts of deionized water, 0.5-1 part of light shielding agent, 0.2-0.8 part of light shielding agent, 0.2 to 0.5 portion of light stabilizer.

The invention has the beneficial effects that: the light shielding agent is added to reflect or refract ultraviolet rays emitted into the paint film, so that the paint film has a good shielding effect on the ultraviolet rays, and the proper amount of the light stabilizer is added to absorb the ultraviolet rays with the wavelength of 240-340nm, so that the waterborne acrylic resin and the waterborne polyurethane resin in the paint film are protected, the waterborne acrylic resin and the waterborne polyurethane resin are prevented from aging, and the protection time of the paint film on dyed veneers and technical veneers is prolonged. And the proper amount of the ultraviolet absorbent can absorb ultraviolet rays with the wavelength of 300-400nm, so that the discoloration caused by the reaction of organic molecules in the paint film, the dyed veneer and the technical veneer is avoided. The antioxidant can protect the paint film and prevent substances in the paint film from generating oxidation reaction to change color, thereby protecting the paint film from being damaged by illumination. The water paint prepared according to the parts by weight has excellent performance, little pollution and good environmental protection performance, and under the synergistic action of the light shielding agent, the light stabilizer and the ultraviolet hand washing machine, the water paint can protect the dyed veneer and the technical veneer under the paint film from yellowing and discoloration and prevent the paint film from aging even under the long-time illumination condition.

In some embodiments, the antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite, the ultraviolet absorber is 2- (2H-benzotriazole-2) -4, 6-bis (1-methyl-1-phenylethyl) phenol, and the light stabilizer is 2-hydroxy-4-n-octoxybenzophenone. The phosphorous acid tri (2, 4-di-tert-butylphenyl) ester has an antioxidant function, provides an antioxidant function for the aqueous acrylic resin and the aqueous polyurethane resin, and prevents the aqueous acrylic resin and the aqueous polyurethane resin from aging due to oxidation reaction caused by the influence of light and air. 2- (2H-benzotriazole-2) -4, 6-bis (1-methyl-1-phenylethyl) phenol can absorb ultraviolet rays with the wavelength of 300-400nm, 2-hydroxy-4-n-octoxybenzophenone can absorb ultraviolet rays with the wavelength of 240-340nm, and the ultraviolet rays and the 2-hydroxy-4-n-octoxybenzophenone are matched with each other, so that the absorption degree of the ultraviolet rays is improved, the ultraviolet rays are prevented from being injected to age a paint film, meanwhile, the ultraviolet rays are prevented from contacting with a dyed veneer or a technical veneer, and the dyed veneer or the technical veneer is prevented from yellowing or discoloring.

In some embodiments, the light shielding agent is one or both of nano-silica, nano-zinc oxide. The nano silicon dioxide and the nano zinc oxide are physical light shielding agents, and light can be reflected and refracted by utilizing the small particle size of the nano silicon dioxide and the nano zinc oxide, so that light cannot enter the interior of a paint film, and the effect of protecting the paint film, the dyed veneer or the technical veneer is achieved.

In some embodiments, the mass ratio of nanosilica to nanosilica in the light-shielding agent is 1: 2. The ratio of the nano silicon dioxide to the nano zinc oxide in the mass ratio of 1:2 is adopted, so that the shielding effect of the light shielding agent on external ultraviolet rays can be improved.

In some embodiments, the fineness of the nano-silica is less than 30nm, the fineness of the nano-zinc oxide is less than 30nm, the fineness of the silica sol is less than 20nm, and the fineness of the cenospheres is less than 40 nm. The smaller the fineness of the nano silicon dioxide and the nano zinc oxide is, the stronger the reflection and refraction capability of the nano silicon dioxide and the nano zinc oxide to light rays is, the stronger the light shielding effect is, the fineness of the nano silicon dioxide and the nano zinc oxide is less than 30nm, the good light shielding effect can be achieved, and a paint film, dyed wood veneer and technical wood veneer can be protected from aging and color change.

In some embodiments, the fineness of the water-based paint for preventing the discoloration of the dyed veneers and technical veneers is less than 30 μm. Can ensure that the water paint does not agglomerate and has good fluidity.

A preparation method of water-based paint for preventing discoloration of dyed veneers and technical veneers is characterized by comprising the following steps:

step a, sequentially adding deionized water, dipropylene glycol butyl ether, dipropylene glycol methyl ether, alcohol ester twelve, a mildew preventive and a wetting agent into a charging basket, and then carrying out primary dispersion by a high-speed dispersion machine, wherein the primary dispersion time is 10-30 minutes, and the primary dispersion speed is 500-800 revolutions per minute;

step b, adding the waterborne acrylic resin, the waterborne polyurethane resin and the defoaming agent into the charging basket, and then carrying out secondary dispersion by using a high-speed dispersion machine, wherein the time of the secondary dispersion is 15-25 minutes, and the dispersion speed of the secondary dispersion is 800-;

step c, adding a base material wetting agent into the charging bucket, and then carrying out third dispersion by a high-speed dispersion machine, wherein the time of the third dispersion is 4-6 minutes, and the dispersion speed of the third dispersion is 500 plus 800 revolutions per minute;

step d, sequentially adding zinc stearate, hollow microspheres and nano titanium dioxide into the charging basket, and then performing fourth dispersion by using a high-speed dispersion machine, wherein the fourth dispersion time is 15-25 minutes, and the dispersion speed of the fourth dispersion is 800-;

step e, adding a tannic acid inhibitor into the material barrel, and then carrying out fifth dispersion by a high-speed dispersion machine, wherein the time of the fifth dispersion is 4-6 minutes, and the dispersion speed of the fifth dispersion is 600-;

step f, adding an amine neutralizer into the charging basket to obtain a first mixture, and ensuring the pH of the first mixture to be 8-9;

step g, sequentially adding a leveling agent, silica sol, an antioxidant, an ultraviolet absorbent, a light shielding agent and a light stabilizer into a charging basket, and then carrying out sixth dispersion by using a high-speed dispersion machine, wherein the dispersion time of the sixth dispersion is 5 minutes, and the dispersion speed of the sixth dispersion is 1000 revolutions per minute;

step h, gradually adding a polyurethane tackifier and an acrylic tackifier into the charging basket to adjust the viscosity, so as to obtain a second mixture, and ensuring the viscosity of the second mixture to be 100S-110S;

and step i, filtering the second mixture to obtain a finished product.

The preparation method of the water-based paint for preventing the discoloration of the dyed veneers and the technical veneers has the beneficial effects that: and a step a to a step i, gradually adding raw materials to ensure the sequential reaction of the corresponding raw materials, dispersing the raw materials in each step by a high-speed dispersing machine, and obtaining the optimal dispersing speed and time of each step through experiments, so as to ensure that each raw material is fully and uniformly reacted and mixed finally, wherein the step h is set to ensure that the viscosity of a finished product meets the requirement, and the step i is set to isolate the agglomerated part in the mixture and ensure the flowability of the finished product.

In some embodiments, after step b is performed, a first additional dispersion is performed, the first additional dispersion having a dispersion time of 5 minutes, the first additional dispersion having a dispersion speed of 1000 rpm, and the first additional dispersion is repeated a plurality of times until the mixture in the barrel after the first additional dispersion does not exhibit cratering. Therefore, the phenomenon that the mixture in the charging basket is shrunk after the step b is implemented, namely the mixture is dispersed unevenly, so that the final finished product is uneven and the service performance of the finished product is influenced can be prevented.

In some embodiments, after step d is performed, a second additional dispersion is performed, the dispersion time of the second additional dispersion being 5 minutes, the dispersion speed of the second additional dispersion being 1000 revolutions per minute, the second additional dispersion being repeated a plurality of times until the fineness of the mixture in the barrel after the second additional dispersion is less than 30 μm. Therefore, the fineness of the mixture in the charging basket is more than 30 mu m after the step d is implemented, and the fineness of the final finished product is too large, so that the use performance of the finished product is prevented from being influenced.

In some embodiments, the second mixture in step i is filtered through a 300 mesh screen. And a 300-mesh filter screen is used for filtering, so that the finally obtained finished product flow channel can meet the requirement.

Detailed Description

The present invention will be described in further detail with reference to examples.

The waterborne acrylic resin in the invention is AR-615W waterborne acrylic resin supplied by Yangguan fangjing synthetic material science and technology Limited, the waterborne polyurethane resin is AMS-2099 waterborne polyurethane resin supplied by Guangdong Yue beautification industry Limited, the antifoaming agent is DOW2109 antifoaming agent supplied by the Dow chemical company, the substrate wetting agent is PSA substrate wetting agent supplied by Tianjin Seifen chemical technology development Limited, the dipropylene glycol butyl ether and the dipropylene glycol methyl ether are selected from the dipropylene glycol butyl ether and the dipropylene glycol methyl ether supplied by rebuke Lily chemical industry Limited of Shenzhen city, the alcohol ester twelve is TEXAtrade NOL alcohol ester twelve supplied by Guangzhou Si Dredging Co., Ltd, the mildew preventive is KF-96 mildew preventive supplied by Guangzhou Donggang chemical technology Limited, the wetting agent is Capstone FS-31000 fluorine wetting agent supplied by Jinningbai chemical industry Limited, the zinc stearate selects 1800 zinc stearate supplied by Shijiazhuang product Bai chemical technology Co., Ltd, the tannin inhibitor selects BW-100 tannin inhibitor supplied by Xiamen Aikoma chemical raw material Co., Ltd, the amine neutralizer selects DeuAdd MA-95 amine neutralizer supplied by Jinshengji chemical Co., Ltd, the flatting agent selects DP-490 acrylic acid flatting agent supplied by Shanghai Daqin chemical Co., Ltd, the polyurethane tackifier and the acrylic acid tackifier both select polyurethane tackifier and acrylic acid tackifier supplied by Federal Fine chemical Co., Ltd, the silica sol and the nano silica both select YD-11 silica sol and nano silica supplied by Zhejiang Dada chemical Co., Ltd, the nano zinc oxide selects DK-ZnO-15 nano zinc oxide supplied by Beijing German Keke chemical technology Co., Ltd, the hollow microsphere selects im30K 3M hollow microsphere supplied by Shanghai electric International trade Co., Ltd, the antioxidant is selected from tris (2, 4-di-tert-butylphenyl) phosphate supplied by hongkongxin Ruider chemical Co., Ltd, the light stabilizer is selected from 2-hydroxy-4-n-octyloxy benzophenone supplied by Dinghai plastics chemical Co., Ltd, Dongguan city, the ultraviolet absorbent is selected from UV-234 ultraviolet absorbent supplied by Nanjing Hualiming chemical Co., Ltd, and the nano titanium dioxide is selected from VK-TA200 nano titanium dioxide supplied by Hangzhou Zhi Ti purification technology Co., Ltd, and the raw materials used in the following examples are the raw materials from the sources mentioned above. The high-speed disperser and the 300-mesh filter screen are both selected from commercial products.

Example 1

Weighing the raw materials in parts by weight as follows: 35 parts of water-based acrylic resin, 20 parts of water-based polyurethane resin, 0.3 part of defoaming agent, 0.2 part of base material wetting agent, 2 parts of dipropylene glycol butyl ether, 2 parts of dipropylene glycol methyl ether, 1 part of alcohol ester, 0.5 part of mildew preventive, 0.3 part of wetting agent, 3 parts of silica sol, 1 part of zinc stearate, 0.5 part of hollow microsphere, 0.5 part of tannic acid inhibitor, 0.1 part of amine neutralizer, 0.2 part of flatting agent, 0.2 part of antioxidant, 0.4 part of ultraviolet absorbent, 0.2 part of polyurethane tackifier, 0.3 part of acrylic tackifier, 0.5 part of nano titanium dioxide, 10 parts of deionized water, 0.5 part of nano silicon dioxide and 0.2 part of light stabilizer.

A preparation method of water-based paint for preventing color change of dyed veneers and technical veneers comprises the following steps:

step a, sequentially adding deionized water, dipropylene glycol butyl ether, dipropylene glycol methyl ether, alcohol ester twelve, a mildew preventive and a wetting agent into a charging basket, and then carrying out primary dispersion by using a high-speed dispersion machine, wherein the primary dispersion time is 10 minutes, and the dispersion speed of the primary dispersion is 500 revolutions per minute;

step b, adding the water-based acrylic resin, the water-based polyurethane resin and the defoaming agent into the charging basket, and then carrying out secondary dispersion by using a high-speed dispersion machine, wherein the time of the secondary dispersion is 15 minutes, and the dispersion speed of the secondary dispersion is 800 revolutions per minute;

c, adding a base material wetting agent into the charging bucket, and then carrying out third-time dispersion by using a high-speed dispersion machine, wherein the time of the third-time dispersion is 4 minutes, and the dispersion speed of the third-time dispersion is 500 revolutions per minute;

step d, sequentially adding zinc stearate, hollow microspheres and nano titanium dioxide into the charging basket, and then performing fourth dispersion by using a high-speed dispersion machine, wherein the fourth dispersion time is 15 minutes, and the dispersion speed of the fourth dispersion is 800 revolutions per minute;

step e, adding a tannic acid inhibitor into the material barrel, and performing fifth dispersion by using a high-speed dispersion machine, wherein the time of the fifth dispersion is 4 minutes, and the dispersion speed of the fifth dispersion is 600 revolutions per minute;

step f, adding an amine neutralizer into the charging basket to obtain a first mixture, and ensuring the pH of the first mixture to be 8;

step g, sequentially adding a leveling agent, silica sol, an antioxidant, an ultraviolet absorbent, nano silicon dioxide and a light stabilizer into a charging basket, and then carrying out sixth dispersion by a high-speed dispersion machine, wherein the time of the sixth dispersion is 5 minutes, and the dispersion speed of the sixth dispersion is 1000 revolutions per minute;

step h, gradually adding a polyurethane tackifier and an acrylic tackifier into the charging basket to adjust the viscosity, so as to obtain a second mixture, and ensuring the viscosity of the second mixture to be 100S;

and step i, filtering the second mixture through a 300-mesh filter screen to obtain a finished product.

After the step b is carried out, in order to ensure that the mixture in the charging basket after the step b is carried out is fully mixed, a shrinkage cavity test can be carried out on the mixture in the charging basket after the step b is carried out, and if no shrinkage cavity phenomenon is observed, the step c is directly carried out; if the shrinkage cavity phenomenon occurs, performing first additional dispersion before performing the step c, wherein the dispersion time of the first additional dispersion is 5 minutes, the dispersion speed is 1000 revolutions per minute, performing the shrinkage cavity test again after the first additional dispersion, performing the first additional dispersion again if the shrinkage cavity phenomenon still occurs, repeating the first additional dispersion for multiple times until the shrinkage cavity phenomenon does not occur in the mixture in the charging basket after the first additional dispersion, and performing the step c again.

After the step d is carried out, in order to ensure that the mixture in the charging basket after the step d is carried out does not have the caking phenomenon, a fineness test can be carried out on the mixture in the charging basket after the step d is carried out, and if the fineness of the mixture in the charging basket after the step d is less than 30 μm, the step c is directly carried out; and if the fineness is more than 30 mu m, performing secondary additional dispersion before performing the step e, wherein the dispersion time of the secondary additional dispersion is 5 minutes, the dispersion speed is 1000 revolutions per minute, performing the fineness test again after the secondary additional dispersion, and if the result is still more than 30 mu m, performing the secondary additional dispersion again, wherein the secondary additional dispersion can be repeated for multiple times until the fineness of the mixture in the charging basket after the secondary additional dispersion is less than 30 mu m, and then performing the step e.

Example 2

Weighing the raw materials in parts by weight as follows: 45 parts of water-based acrylic resin, 30 parts of water-based polyurethane resin, 0.7 part of defoaming agent, 1 part of substrate wetting agent, 5 parts of dipropylene glycol butyl ether, 4 parts of dipropylene glycol methyl ether, twelve 3 parts of alcohol ester, 1 part of mildew preventive, 0.6 part of wetting agent, 5 parts of silica sol, 4 parts of zinc stearate, 1 part of hollow microsphere, 1 part of tannic acid inhibitor, 0.5 part of amine neutralizer, 0.5 part of flatting agent, 0.4 part of antioxidant, 0.8 part of ultraviolet absorbent, 0.5 part of polyurethane tackifier, 0.8 part of acrylic tackifier, 1 part of nano titanium dioxide, 20 parts of deionized water, 1 part of nano zinc oxide and 0.5 part of light stabilizer.

A preparation method of water-based paint for preventing color change of dyed veneers and technical veneers comprises the following steps:

step a, sequentially adding deionized water, dipropylene glycol butyl ether, dipropylene glycol methyl ether, alcohol ester twelve, a mildew preventive and a wetting agent into a charging basket, and then carrying out primary dispersion by using a high-speed dispersion machine, wherein the primary dispersion time is 30 minutes, and the dispersion speed of the primary dispersion is 800 revolutions per minute;

step b, adding the water-based acrylic resin, the water-based polyurethane resin and the defoaming agent into the charging basket, and then carrying out secondary dispersion by using a high-speed dispersion machine, wherein the time of the secondary dispersion is 25 minutes, and the dispersion speed of the secondary dispersion is 1000 revolutions per minute;

c, adding a base material wetting agent into the charging bucket, and then carrying out third dispersion by using a high-speed dispersion machine, wherein the time of the third dispersion is 6 minutes, and the dispersion speed of the third dispersion is 800 revolutions per minute;

d, sequentially adding zinc stearate, hollow microspheres and nano titanium dioxide into the charging basket, and then performing fourth dispersion by using a high-speed dispersion machine, wherein the fourth dispersion time is 25 minutes, and the dispersion speed of the fourth dispersion is 1000 revolutions per minute;

step e, adding a tannic acid inhibitor into the material barrel, and performing fifth dispersion by using a high-speed dispersion machine, wherein the time of the fifth dispersion is 6 minutes, and the dispersion speed of the fifth dispersion is 800 revolutions per minute;

step f, adding an amine neutralizer into the charging basket to obtain a first mixture, and ensuring the pH of the first mixture to be 9;

step g, sequentially adding a leveling agent, silica sol, an antioxidant, an ultraviolet absorbent, nano zinc oxide and a light stabilizer into a charging basket, and then carrying out sixth dispersion by a high-speed dispersion machine, wherein the time of the sixth dispersion is 5 minutes, and the dispersion speed of the sixth dispersion is 1000 revolutions per minute;

step h, gradually adding a polyurethane tackifier and an acrylic tackifier into the charging basket to adjust the viscosity, so as to obtain a second mixture, and ensuring the viscosity of the second mixture to be 110S;

and step i, filtering the second mixture through a 300-mesh filter screen to obtain a finished product.

After the step b is carried out, in order to ensure that the mixture in the charging basket after the step b is carried out is fully mixed, a shrinkage cavity test can be carried out on the mixture in the charging basket after the step b is carried out, and if no shrinkage cavity phenomenon is observed, the step c is directly carried out; if the shrinkage cavity phenomenon occurs, performing first additional dispersion before performing the step c, wherein the dispersion time of the first additional dispersion is 5 minutes, the dispersion speed is 1000 revolutions per minute, performing the shrinkage cavity test again after the first additional dispersion, performing the first additional dispersion again if the shrinkage cavity phenomenon still occurs, repeating the first additional dispersion for multiple times until the shrinkage cavity phenomenon does not occur in the mixture in the charging basket after the first additional dispersion, and performing the step c again.

After the step d is carried out, in order to ensure that the mixture in the charging basket after the step d is carried out does not have the caking phenomenon, a fineness test can be carried out on the mixture in the charging basket after the step d is carried out, and if the fineness of the mixture in the charging basket after the step d is less than 30 μm, the step c is directly carried out; and if the fineness is more than 30 mu m, performing secondary additional dispersion before performing the step e, wherein the dispersion time of the secondary additional dispersion is 5 minutes, the dispersion speed is 1000 revolutions per minute, performing the fineness test again after the secondary additional dispersion, and if the result is still more than 30 mu m, performing the secondary additional dispersion again, wherein the secondary additional dispersion can be repeated for multiple times until the fineness of the mixture in the charging basket after the secondary additional dispersion is less than 30 mu m, and then performing the step e.

Example 3

Weighing the raw materials in parts by weight as follows: 40 parts of water-based acrylic resin, 25 parts of water-based polyurethane resin, 0.5 part of defoaming agent, 0.6 part of base material wetting agent, 3.5 parts of dipropylene glycol butyl ether, 3 parts of dipropylene glycol methyl ether, 2 parts of alcohol ester, 0.7 part of mildew preventive, 0.4 part of wetting agent, 4 parts of silica sol, 2.5 parts of zinc stearate, 0.7 part of hollow microsphere, 0.7 part of tannic acid inhibitor, 0.3 part of amine neutralizer, 0.3 part of flatting agent, 0.3 part of antioxidant, 0.6 part of ultraviolet absorbent, 0.3 part of polyurethane tackifier, 0.5 part of acrylic tackifier, 0.7 part of nano titanium dioxide, 15 parts of deionized water, 0.25 part of nano silicon dioxide, 0.5 part of nano zinc oxide and 0.3 part of light stabilizer.

A preparation method of water-based paint for preventing discoloration of dyed veneers and technical veneers is characterized by comprising the following steps:

step a, sequentially adding deionized water, dipropylene glycol butyl ether, dipropylene glycol methyl ether, alcohol ester twelve, a mildew preventive and a wetting agent into a charging basket, and then carrying out primary dispersion by a high-speed dispersion machine, wherein the primary dispersion time is 20 minutes, and the dispersion speed of the primary dispersion is 650 revolutions per minute;

step b, adding the water-based acrylic resin, the water-based polyurethane resin and the defoaming agent into the charging basket, and then carrying out secondary dispersion by using a high-speed dispersion machine, wherein the time of the secondary dispersion is 20 minutes, and the dispersion speed of the secondary dispersion is 900 revolutions per minute;

c, adding a base material wetting agent into the charging bucket, and then carrying out third dispersion by using a high-speed dispersion machine, wherein the time of the third dispersion is 5 minutes, and the dispersion speed of the third dispersion is 650 revolutions per minute;

d, sequentially adding zinc stearate, hollow microspheres and nano titanium dioxide into the charging basket, and then performing fourth dispersion by using a high-speed dispersion machine, wherein the fourth dispersion time is 20 minutes, and the dispersion speed of the fourth dispersion is 900 revolutions per minute;

step e, adding a tannic acid inhibitor into the material barrel, and performing fifth dispersion by using a high-speed dispersion machine, wherein the time of the fifth dispersion is 5 minutes, and the dispersion speed of the fifth dispersion is 700 revolutions per minute;

step f, adding an amine neutralizer into the charging basket to obtain a first mixture, and ensuring the pH of the first mixture to be 8.5;

step g, sequentially adding a flatting agent, silica sol, an antioxidant, an ultraviolet absorbent, nano silicon dioxide, nano zinc oxide and a light stabilizer into a charging basket, wherein the mass ratio of the nano silicon dioxide to the nano zinc oxide is 1:2, and then carrying out sixth dispersion by a high-speed dispersion machine, wherein the time of the sixth dispersion is 5 minutes, and the dispersion speed of the sixth dispersion is 1000 revolutions per minute;

step h, gradually adding a polyurethane tackifier and an acrylic tackifier into the charging basket to adjust the viscosity, so as to obtain a second mixture, and ensuring that the viscosity of the second mixture is 105S;

and step i, filtering the second mixture through a 300-mesh filter screen to obtain a finished product.

After the step b is carried out, in order to ensure that the mixture in the charging basket after the step b is carried out is fully mixed, a shrinkage cavity test can be carried out on the mixture in the charging basket after the step b is carried out, and if no shrinkage cavity phenomenon is observed, the step c is directly carried out; if the shrinkage cavity phenomenon occurs, performing first additional dispersion before performing the step c, wherein the dispersion time of the first additional dispersion is 5 minutes, the dispersion speed is 1000 revolutions per minute, performing the shrinkage cavity test again after the first additional dispersion, performing the first additional dispersion again if the shrinkage cavity phenomenon still occurs, repeating the first additional dispersion for multiple times until the shrinkage cavity phenomenon does not occur in the mixture in the charging basket after the first additional dispersion, and performing the step c again.

After the step d is carried out, in order to ensure that the mixture in the charging basket after the step d is carried out does not have the caking phenomenon, a fineness test can be carried out on the mixture in the charging basket after the step d is carried out, and if the fineness of the mixture in the charging basket after the step d is less than 30 μm, the step c is directly carried out; and if the fineness is more than 30 mu m, performing secondary additional dispersion before performing the step e, wherein the dispersion time of the secondary additional dispersion is 5 minutes, the dispersion speed is 1000 revolutions per minute, performing the fineness test again after the secondary additional dispersion, and if the result is still more than 30 mu m, performing the secondary additional dispersion again, wherein the secondary additional dispersion can be repeated for multiple times until the fineness of the mixture in the charging basket after the secondary additional dispersion is less than 30 mu m, and then performing the step e.

Example 4

Performance testing

The water-based paints in examples 1-3 and the control group were tested for environmental protection, water resistance, dry time, adhesion, yellowing resistance, etc.

The test method is as follows:

1. environmental protection performance: subjective feelings of production and users;

2. water resistance: measuring the water immersion time for 24 hours according to a water immersion test method in GB/T1733 + 1993 paint film water resistance measuring method;

3. surface drying time: the determination is carried out according to the surface drying time determination method in GB/T1728-1979 (1989) determination methods of drying time of paint films and putty films;

4. actual drying time: the determination is carried out according to the actual drying time determination method in GB/T1728-1979 (1989) determination methods of drying time of paint films and putty films;

5. adhesion force: the adhesion was measured according to the method described in GB/T1720-1979 (1989) paint film adhesion determination;

6. yellowing resistance 500 hours color difference: the determination is carried out by continuous illumination exposure for 500 hours according to the determination method in GB/T23983 + 2009 woodware paint yellowing resistance test method;

in the test process, ZY-0668 yellowing-resistant matte extra-white finish with the brand of Xiangjiang paint is selected as a control group for performance comparison. After performance testing, the following data were obtained:

TABLE 1 results of performance tests on waterborne paints for protection against discoloration of dyed wood and technical veneers and control in examples 1-3

As can be seen from Table 1, the water-based paints for preventing the discoloration of dyed wood and technical wood veneers in examples 1-3 of the present application all have better properties than the control group. The environmental protection performance of the contrast group is poor, and the paint liquid has peculiar smell and can volatilize chemical substances into the air to influence the environment; the water-based paint for preventing the discoloration of the dyed wood and the technical wood veneer, which is prepared by the invention, has excellent environmental protection performance, does not volatilize chemical substances in the using process, and is safe and friendly to the environment. The surface drying time of the control group is 40min, while the surface drying time of the water-based paint for preventing the discoloration of the dyed wood and the technical wood veneer prepared by the invention is 20min, which is shortened by 100 percent compared with the control group; the actual drying time of the control group is 165min, while the actual drying time of the water-based paint for preventing the discoloration of the dyed wood and the technical wood veneer is 100min-105min, which is reduced by 36% -39% compared with the control group; the adhesive force of the contrast group is grade 2, while the adhesive force of the water-based paint for preventing the discoloration of the dyed wood and the technical wood veneer is grade 1, which is stronger than that of the contrast group. The yellowing resistance of the water-based paint for preventing the discoloration of the dyed wood and the scientific and technological veneer is not more than 0.6 in 500 hours, the color difference is improved by 98.42-98.68% compared with the yellowing resistance of a control group, and the water-based paint has outstanding yellowing resistance and discoloration prevention effects.

From the above test results, the finished products obtained in examples 1-3 have excellent yellowing resistance, and under long-term illumination and exposure, the paint film can shield light, so as to prevent the dye molecules in the dyed veneers and the technical veneers from undergoing chemical reaction and changing color under illumination or sunshine, so that the dyed veneers and the technical veneers under the paint film do not turn yellow and change color, and the purpose of protecting the colors of the dyed veneers and the technical veneers is achieved.

What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.