Dye suitable for coloring woodcarving

Abstract

According to the dye, modified particles are added, a core shell is matched with a castor oil modified layer to form a three-layer composite structure, ricinoleic acid is promoted to be subjected to air curing through a drier, the hardness of a formed paint film can be greatly improved under the cooperation, and meanwhile the ultraviolet shielding performance is improved; the acrylic ester is added into the dye, so that the two-component structure is favorable for reducing the cost, and is favorable for improving the water resistance, weather resistance and the like of a paint film.

Description

Technical Field

[0001] The present invention relates to the technical field of dyes, and particularly to dyes suitable for coloring woodcarvings. Background Art

[0002] Dongyang woodcarving is one of the folk carving arts of the Han nationality. It is a carving art mainly based on plane relief, characterized by its multi-level relief, scattered perspective composition, and retention of plane decoration, thus forming its own distinct characteristics. It is widely used in architecture, handicrafts, and furniture decoration.

[0003] To meet people's aesthetic needs and the protection needs of woodcarvings, modern Dongyang woodcarvings are generally colored. Commonly used are water-based polyurethane wood lacquers. However, the films formed by common polyurethane lacquers on the market have defects such as low hardness and low ultraviolet shielding performance, which need to be improved. Summary of the Invention

[0004] To solve the above at least one technical defect, the present invention provides the following technical solutions:

[0005] This application document discloses a dye suitable for coloring woodcarvings. By mass, it includes 45 - 60 parts of a mixture of diisocyanate and alcohol, 1 - 3 parts of modified particles, 0.3 - 1.5 parts of a catalyst, 0.7 - 2.0 parts of a chain extender, 0.1 - 0.3 parts of a dispersant, 0.5 - 1.2 parts of a thickener, 15 - 25 parts of acrylate, 0.5 - 2 parts of a curing agent, 0.1 - 0.3 parts of a dryer, 0.1 - 0.4 parts of an antifoaming agent, and 10 - 25 parts of water; wherein the modified particles: with nano-titanium dioxide and nano-boron carbide as the core, lignin as the shell layer, and castor oil modifying the lignin shell layer.

[0006] This dye adds modified particles, and the core-shell combined with the castor oil modified layer forms a three-layer composite configuration. The dryer promotes the air curing of ricinoleic acid. In combination, it can greatly improve the hardness of the formed paint film, and at the same time improve the ultraviolet shielding performance and enhance the protection of coated objects such as woodcarvings.

[0007] Acrylate is added to this dye. The two-component structure helps to reduce costs and also helps to improve the water resistance, weather resistance, etc. of the paint film.

[0008] Further, the preparation of the modified particles is as follows: Add nano-titanium dioxide and nano-boron carbide powders to deionized water and ultrasonically disperse to form a slurry. Mix lignin with the slurry, and mix and stir at 65 - 85 °C under alkaline conditions until the pH value of the solution is neutral. Dry and grind the separated solid particles to obtain solid particles with nano-titanium dioxide and nano-boron carbide as the core and lignin as the shell layer;

[0009] Mix ricinoleic acid with solid particles in a solvent, and under the catalysis of an acidic catalyst, carry out an esterification reaction between ricinoleic acid and lignin at the shell layer of the solid particles to form a modification of the lignin shell layer with castor oil.

[0010] In this scheme, lignin is used to coat nano-titanium dioxide and nano-boron carbide powders through physical blending. Then, ricinoleic acid reacts with lignin under the action of an acidic catalyst to form a ricinoleic acid modification layer on the lignin shell layer. The whole process has the advantages of simplicity and easy operation.

[0011] Furthermore, the mass ratio of nano-titanium dioxide to nano-boron carbide is 1 - 2:0.4 - 0.6, the ratio of lignin to the mass sum of nano-titanium dioxide and nano-boron carbide is 2 - 4:1, and the mass ratio of ricinoleic acid to solid particles is 1 - 2:1. Under the limited quantitative ratio, it helps to improve the performance of the dye.

[0012] Furthermore, the reaction between ricinoleic acid and lignin at the shell layer of the solid particles is carried out at 100 - 150 °C for more than 10 h.

[0013] Furthermore, the acidic catalyst is p-toluenesulfonic acid and the solvent is acetone.

[0014] Furthermore, the alcohol is any one of polyethylene glycol, polypropylene glycol, and polycarbonate diol, the diisocyanate is any one of hexamethylene diisocyanate, isophorone diisocyanate, and toluene diisocyanate, the catalyst is any one of dibutyltin dilaurate and triethanolamine, and the chain extender is a mixture of 1,4-butanediol and dimethylolpropionic acid in a mass ratio of 1 - 1.5:1.

[0015] Furthermore, the dispersant is ammonium polyacrylate, the thickener is any one of polyacrylamide and polyacrylic acid, the curing agent is trimethylolpropane, and the defoamer is an organopolysiloxane defoamer.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. The present invention adds three-layer composite modified particles to the dye. With a small amount of addition, it can greatly improve the hardness of the paint film. Combined with the improvement of the ultraviolet shielding function, it has excellent protective performance for wooden utensils such as wooden carvings attached with the paint film. Specific embodiments

[0018] The following further illustrates the present invention with specific embodiments.

[0019] Preparation of nano-titanium dioxide and nano-boron carbide powders: Add boron carbide powder to a Tris-HCL buffer solution and ethanol mixture, where the volume ratio of the buffer solution to ethanol is 3:1, and the mass-volume ratio of boron carbide to the mixture is 1 g / 0.15 L, and ultrasonically treat for 30 min.

[0020] Add dopamine hydrochloride to the ultrasonicated boron carbide dispersion. The mass ratio of dopamine hydrochloride to boron carbide is 0.5:1. Adjust the pH to 8.5 with sodium hydroxide, and stir magnetically for 2 h. After centrifugal separation and drying, polydopamine-modified nano-boron carbide is obtained.

[0021] Mix ethanol, water, and isopropanol in a volume ratio of 15:5:80, and add tetrabutyl titanate (mass-volume ratio of 3 g:100 ml) to form a precursor solution. Add the polydopamine-modified nano-boron carbide and coupling agent KH550 to the precursor solution and stir for 4 h. After solid-liquid separation and drying, nano-titanium dioxide and nano-boron carbide powders are obtained. The addition amount of the coupling agent is 2% of the mass of the polydopamine-modified nano-boron carbide. Add the polydopamine-modified nano-boron carbide according to the ratio of the mass of boron carbide to titanium dioxide of 3:1.

[0022] Preparation of modified particles:

[0023] Add the prepared nano-titanium dioxide and nano-boron carbide powders to deionized water (mass-volume ratio of 1:10) and ultrasonically disperse to form a slurry. Mix lignin with the slurry. The addition amount of lignin is 2.5 times the mass of the nano-titanium dioxide and nano-boron carbide powders. Adjust the pH to 8.5, heat up to 80 °C, mix and stir until the pH value of the solution is neutral (i.e., pH = 7). Filter, wash, and dry the separated solid particles, and then grind to obtain solid particles with nano-titanium dioxide and nano-boron carbide as the core and lignin as the shell layer. After detection, the coating amount of lignin is 10%.

[0024] Mix ricinoleic acid and solid particles in solvent acetone. The mass ratio of ricinoleic acid to solid particles is 1.5:1. The sum of their masses and the mass-volume of acetone is 1:4. Use p-toluenesulfonic acid as an acidic catalyst, and its addition amount is 1% of the solid particles. React at 100 °C for 10 h. Under the catalysis of the acidic catalyst, the ricinoleic acid reacts with the lignin at the shell layer of the solid particles to form an esterification reaction, and the ricinoleic acid modifies the lignin shell layer. After filtration, wash and dry to obtain modified particles.

[0025] Mix cobalt naphthenate and calcium naphthenate in a mass ratio of 1:1 to obtain a drier.

[0026] Example 1

[0027] The preparation of the dye applicable to wood carving coloring is as follows: By mass, add 50 parts of a mixture of isophorone diisocyanate and polypropylene glycol (N210) (the mass ratio of isophorone diisocyanate to polypropylene glycol is 23:8) into a container, then add 0.8 part of dibutyltin dilaurate, 1.2 parts of 1,4-butanediol, heat up to 75 °C and react for 1.5 h, cool down to 65 °C, add 1 g of dimethylolpropionic acid and react for 10 min, then cool down to 40 °C, add 0.2 part of polyacrylamide, 20 parts of acrylate, adjust the pH value to 7 with triethylamine, then add 0.8 part of ammonium polyacrylate, 0.7 part of trimethylolpropane, 0.2 part of a drier prepared by mixing cobalt naphthenate and calcium naphthenate in a mass ratio of 1:1, 2 parts of the above-prepared modified particles, 20 parts of deionized water, stir and emulsify, and finally add organopolysiloxane to defoam to obtain the required dye.

[0028] Example 2

[0029] The preparation of the dye applicable to wood carving coloring is as follows: By mass, add 49 parts of a mixture of isophorone diisocyanate and polypropylene glycol (N210) (the mass ratio of isophorone diisocyanate to polypropylene glycol is 25:8) into a container, then add 0.7 part of dibutyltin dilaurate, 1.3 parts of 1,4-butanediol, heat up to 75 °C and react for 1.5 h, cool down to 65 °C, add 1.1 g of dimethylolpropionic acid and react for 10 min, then cool down to 40 °C, add 0.3 part of polyacrylamide, 22 parts of acrylate, adjust the pH value to 7 with triethylamine, then add 1.0 part of ammonium polyacrylate, 0.6 part of trimethylolpropane, 0.3 part of a drier prepared by mixing cobalt naphthenate and calcium naphthenate in a mass ratio of 1:1, 2 parts of modified particles, 20 parts of deionized water, stir and emulsify, and finally add organopolysiloxane to defoam to obtain the required dye.

[0030] Comparative Example 1

[0031] Compared with Example 1, the difference is that in this example, ricinoleic acid does not react with the solid particles with nano-titanium dioxide and nano-boron carbide as the core and lignin as the shell layer, and ricinoleic acid is directly mixed with other components independently according to the addition amount in Example 1.

[0032] Comparative Example 2

[0033] Compared with Example 1, the difference is that in this example, there is no esterification compounding process of titanium dioxide and boron carbide in the modified particles. After directly mixing the commercially available nano-titanium dioxide powder and nano-boron carbide powder, add them into deionized water, and then add lignin.

[0034] Coat the dyes prepared in the above examples and comparative examples on the formed paint film, and detect the hardness and ultraviolet shielding of the paint film, as shown in Table 1:

[0035] Table 1

[0036]

[0037] The ultraviolet shielding capabilities of the formed paint films in Example 1, Example 2, Comparative Example 1, and Comparative Example 2 all exceed 90%, which can better protect wood carvings and the like adhered to the paint film. Moreover, the hardness of the paint film is greatly improved, which can also enhance the protection strength of the paint film.

[0038] In addition, other colorants and the like can be added to this dye to endow the film layer with different colors and the like. The colorant can be selected according to requirements, which will not be elaborated here.

[0039] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and refinements made without departing from the principle of the present invention should also be regarded as within the protection scope of the present invention.

Claims

1. A dye suitable for coloring wood carvings, characterized in that: By mass, it comprises 45-60 parts of a mixture of diisocyanate and alcohol, 1-3 parts of modified particles, 0.3-1.5 parts of a catalyst, 0.7-2.0 parts of a chain extender, 0.1-0.3 parts of a dispersant, 0.5-1.2 parts of a thickener, 15-25 parts of an acrylate, 0.5-2 parts of a curing agent, 0.1-0.3 parts of a drying agent, 0.1-0.4 parts of a defoaming agent, and 10-25 parts of water; The modified particles have nano titanium dioxide and nano boron carbide as the core, lignin as the shell, and castor oil to modify the lignin shell.

2. The dye suitable for coloring wood carvings as claimed in claim 1, characterized in that: The modified particles are prepared as follows: nano titanium dioxide and nano boron carbide powders are added to deionized water for ultrasonic dispersion to form a slurry, lignin is mixed with the slurry, mixed and stirred at 65-85° C. under alkaline conditions until the pH value of the solution is neutral, and the separated solid particles are dried and ground to obtain solid particles with nano titanium dioxide and nano boron carbide as the core and lignin as the shell; The ricinoleic acid and solid particles are mixed in a solvent, and the ricinoleic acid and the lignin at the shell of the solid particles are esterified under the catalysis of an acidic catalyst, so that the lignin shell is modified by castor oil.

3. The dye suitable for coloring wood carvings as claimed in claim 2, characterized in that: The mass ratio of nano titanium dioxide to nano boron carbide is 1-2:0.4-0.6, the sum of the mass of lignin, nano titanium dioxide and nano boron carbide is 2-4:1, and the mass ratio of ricinoleic acid to solid particles is 1-2:

1.

4. The dye suitable for coloring wood carvings as claimed in claim 2, characterized in that: The ricinoleic acid reacts with the lignin at the shell of the solid particles at 100-150° C. for more than 10 hours.

5. The dye suitable for coloring wood carvings as claimed in claim 2, characterized in that: The acid catalyst is p-toluenesulfonic acid and the solvent is acetone.

6. The dye suitable for coloring wood carvings as claimed in claim 1, characterized in that: The alcohol is any one of polyethylene glycol, polypropylene glycol, and polycarbonate diol; the diisocyanate is any one of hexamethylene diisocyanate, isophorone diisocyanate, and toluene diisocyanate; the catalyst is any one of dibutyltin dilaurate and triethanolamine; and the chain extender is a mixture of 1,4-butanediol and dihydroxymethylpropionic acid in a mass ratio of 1-1.5:

1.

7. The dye suitable for coloring wood carvings as claimed in claim 1, characterized in that: The dispersant is ammonium polyacrylate, the thickener is any one of polyacrylamide and polyacrylic acid, the curing agent is trimethylolpropane, and the defoamer is an organic polysiloxane type defoamer.

Images