Anti-ultraviolet aged lacquer leather softener for lacquer furniture as well as preparation method and application of anti-ultraviolet aged lacquer leather softener

Abstract

The invention discloses an anti-ultraviolet type lacquer furniture aging paint leather softener which comprises the following components in percentage by mass: 20-40 wt% of polyethylene glycol, 55-70 wt% of ethanol and 1-10 wt% of castor oil, and the sum of the mass percentages of the components is 100%. The preparation method of the softening agent comprises the following steps: sequentially adding the polyethylene glycol, the ethanol and the castor oil into a reaction container according to the mass percent; and stirring the mixed solution at a predetermined temperature to fully and uniformly mix the components, thereby obtaining the anti-ultraviolet aged lacquer leather softener for lacquer furniture. Softener test analysis shows that the appearance color of the aged patent leather is obviously improved, polyethylene glycol permeates into the aged patent leather block to generate a swelling effect, so that a compact structure becomes loose, and a foundation is laid for improving color uniformity. The castor oil serves as a plasticizer, fills aging gaps of the paint leather to make the surface smooth, reduces chromatic aberration caused by uneven light reflection and refraction, and cooperates with other reagents to optimize color expression. Ethanol is used as a solvent to assist permeation of polyethylene glycol and castor oil, and the volatilization characteristic of ethanol adjusts distribution of internal components, so that color influencing factors tend to be balanced after softening, and the color difference value is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of restoration of Chinese lacquer furniture, and relates to an anti-ultraviolet Chinese lacquer furniture aging paint skin softening agent, its preparation method and application, especially for the restoration of diseases such as hardening and cracking caused by photoaging and hydrothermal aging of the coating layer, and has the function of anti-ultraviolet. Background Art

[0002] As a treasure of Chinese traditional culture, Chinese lacquer furniture carries profound historical and artistic values. Affected by factors such as time and environment, its paint skin is prone to aging phenomena, such as changes in surface color, reduction in gloss, increase in hardness, decrease in flexibility, and even problems such as cracks and peeling. These aging problems not only affect the beauty of Chinese lacquer furniture, but also reduce its physical properties and service life.

[0003] At present, softening agents are mainly divided into two categories: chemical softening agents and physical softening agents. The chemical softening method (soaking in organic solvents) can cut the molecular chains of a small number of rubber hydrocarbons and can be regarded as a weak peptizer. In the prior art, a softening agent prepared by compounding polyethylene glycol (PEG) and ethanol is often used, and the hygroscopicity of PEG is used to penetrate the paint layer to reduce brittleness. However, this method does not consider the anti-ultraviolet requirement, and the paint skin is prone to photoaging again after restoration. At the same time, the residual of some solvents may accelerate the deterioration of the paint layer. The presence of toxic substances such as formaldehyde and benzene and phthalate plasticizers poses a double hazard to human health and the ecological environment (Practical Technology Manual for Furniture Restoration, Zhang Hua et al., Industrial Publishing House, 2nd Edition, 2010, pages 105-110).

[0004] The physical softening method (steam and hot water softening) mainly weakens the intermolecular forces of rubber hydrocarbons. In the prior art, high-temperature steam is often used to soften the paint skin, and the flexibility of the paint layer is restored through the thermal expansion effect. However, this method is prone to thermal stress damage to the paint skin, cannot improve the anti-aging performance, and cannot solve the problem of ultraviolet aging.

[0005] The existing methods have insufficient synergistic optimization of paint skin color difference, hardness, flexibility and ultraviolet resistance, and are difficult to meet the requirements of Chinese lacquer furniture restoration. Therefore, it is necessary to develop a softening and repairing material that can effectively soften the aging paint skin, has good anti-ultraviolet performance, and has no damage to the paint skin, which is of great significance for the restoration of the coating layer of Chinese lacquer furniture. Summary of the Invention

[0006] The object of the present invention is to provide an anti-ultraviolet type softening agent for aged lacquer skin of large lacquer furniture, its preparation method and application, so as to solve the problems existing in the existing repair materials for aged lacquer skin of large lacquer furniture, such as poor softening effect, lack of anti-ultraviolet function, possible secondary damage to the lacquer skin, and insufficient consideration of ultraviolet treatment factors. By using this repair material and method, the aged lacquer skin can be effectively softened, its flexibility and elasticity can be restored, at the same time, the anti-ultraviolet ability of the lacquer skin can be enhanced, the service life of the lacquer skin can be extended, and no damage will be caused to the lacquer skin. And by scientifically optimizing the ultraviolet treatment process, the overall repair effect can be improved.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] The present invention provides an anti-ultraviolet type softening agent for aged lacquer skin of large lacquer furniture, which includes polyethylene glycol (PEG), ethanol and castor oil, and the mass percentages of each component are:

[0009] Polyethylene glycol 20 - 40 wt%, ethanol 55 - 70 wt% and castor oil 1 - 10 wt%, and the sum of the mass percentages of each component is 100%.

[0010] In a preferred scheme, the polyethylene glycol used is PEG-400.

[0011] The present invention also provides a preparation method of an anti-ultraviolet type softening agent for aged lacquer skin of large lacquer furniture, which includes:

[0012] According to the above mass percentages, polyethylene glycol, ethanol and castor oil are sequentially added into a reaction vessel;

[0013] At a predetermined temperature, the mixed solution is stirred to make each component fully mixed and uniform, and an anti-ultraviolet type softening agent for aged lacquer skin of large lacquer furniture is prepared.

[0014] In a preferred scheme, at a temperature of 20 - 25 °C, it is stirred at a stirring speed of 150 - 250 revolutions per minute for 30 - 60 minutes.

[0015] The present invention also provides the application of the anti-ultraviolet type softening agent for aged lacquer skin of large lacquer furniture, and it is applied to the repair process of aged lacquer skin of large lacquer furniture.

[0016] Furthermore, the repair process of aged lacquer skin of large lacquer furniture is as follows:

[0017] (1) Lacquer skin pretreatment: Select the naturally peeled or aged lacquer skin of large lacquer furniture from the Ming and Qing dynasties. First, gently wipe the surface of the lacquer skin with a soft cloth dipped in diluted alcohol to remove dirt, dust and impurities, and then air dry it naturally;

[0018] (2) Applying the repair material: Using a brush tool, evenly apply the prepared softening agent on the surface of the pre-treated varnished leather to ensure complete coverage of the varnished leather surface;

[0019] (3) Synergistic stage of ultraviolet treatment and softening treatment: Place the varnished leather coated with the softening agent into a device that can precisely control the ultraviolet irradiation intensity, irradiation time, and treatment temperature;

[0020] (4) Curing and post-treatment: After completing the ultraviolet treatment and softening process, place the varnished leather in a closed environment for curing treatment for 0.5 - 36 h, then take out the varnished leather and air-dry it to make the repair material on the surface of the varnished leather dry and cure.

[0021] Furthermore, in step (1), in the diluted alcohol, the volume ratio of alcohol to water is 1:1 - 3.

[0022] Furthermore, in step (2), the dosage of the softening agent is 20 - 40 times the mass of the varnished leather.

[0023] Furthermore, in step (3), use a constant temperature and humidity ultraviolet treatment chamber, with an ultraviolet irradiation intensity of 50 - 200 W / m 2 , an irradiation time of 1 - 12 h, and a treatment temperature of 25 - 55 °C; meanwhile, during this process, keep the ambient temperature at 18 - 22 °C to allow the softening agent to fully penetrate into the interior of the varnished leather and achieve the softening of the varnished leather.

[0024] Furthermore, in step (4), place the varnished leather in a well-ventilated place at a temperature of 20 - 25 °C and a relative humidity of 40% - 60% to air-dry for 5 - 10 days.

[0025] Furthermore, in step (4), after drying and curing, further backfill, sand, polish, and spray paint the varnished leather to restore the gloss and texture of the varnished leather.

[0026] Key technical points of the present invention:

[0027] (1) Natural and environmentally friendly ingredient combination: Select polyethylene glycol, castor oil, and ethanol as the main components. Among them, polyethylene glycol has good biocompatibility, castor oil is derived from natural plants, and ethanol is volatile and environmentally friendly, avoiding the use of harmful chemical substances in traditional repair materials and ensuring human health and environmental safety.

[0028] (2) Synergistic action mechanism: Polyethylene glycol and castor oil synergistically penetrate into the interior of the varnished leather. Through the interaction with the varnished leather molecules, they jointly weaken the intermolecular binding force, improve the flexibility and plasticity of the varnished leather, and have a significant softening effect.

[0029] (3) Anti-ultraviolet function: The unsaturated bonds contained in castor oil can absorb ultraviolet rays, giving the repair material anti-ultraviolet properties, effectively reducing the damage of ultraviolet rays to the paint leather and extending the service life of the paint leather.

[0030] (4) Precise parameter control: Through orthogonal experiments, the optimal combination of key parameters such as UV irradiation intensity, irradiation time, treatment temperature and curing time was accurately determined, achieving precise control of the repair process and improving the stability and reliability of the repair effect.

[0031] Compared with the prior art, the beneficial technical effects of the present invention are:

[0032] The softener test analysis showed that the appearance and color of the aged patent leather were significantly improved. Polyethylene glycol penetrated into the aged patent leather block to produce swelling, making the compact structure loose, laying the foundation for improving color uniformity. Castor oil acts as a plasticizer to fill the aged gaps in the patent leather to make the surface smooth, reduce the color difference caused by uneven light reflection and refraction, and cooperate with other reagents to optimize the color performance. Ethanol, as a solvent, helps polyethylene glycol and castor oil penetrate. Its volatile characteristics adjust the distribution of internal components, so that the factors affecting the color tend to be balanced after softening, and the color difference value is reduced.

[0033] Traditional lacquer furniture leather repair materials often contain harmful substances such as phthalate plasticizers and benzophenone ultraviolet absorbers, which pose a threat to human health and the environment. However, the ingredients such as polyethylene glycol, castor oil and ethanol used in the present invention have good biocompatibility and biodegradability. According to tests, the amount of harmful substances volatilized in the air during the repair process using the repair material of the present invention is almost zero, and there is no adverse effect on the health of operators.

[0034] The unsaturated bonds contained in castor oil can absorb ultraviolet rays, giving the repair material anti-ultraviolet properties, effectively reducing the damage of ultraviolet rays to the paint leather and extending the service life of the paint leather. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The color difference analysis of the softeners prepared in Examples 1 to 6 on aged patent leather;

[0036] Figure 2 This is a real picture of the lacquer furniture before restoration.

[0037] Figure 3 This is a real picture of the lacquer furniture under restoration.

[0038] Figure 4 This is the actual picture of the restored lacquer furniture. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] The present invention will be described below in conjunction with specific embodiments and drawings.

[0041] Embodiment 1

[0042] A preparation method of an anti-ultraviolet type aging paint skin softener for large lacquer furniture includes:

[0043] In accordance with the above mass percentages, PEG-400, ethanol, and castor oil are sequentially added to a reaction vessel, with PEG-400 being 40 wt%, ethanol being 55 wt%, and castor oil being 5 wt%. The sum of the mass percentages of each component is 100%;

[0044] At a temperature of 20 - 25 °C, with a stirring speed of 200 revolutions per minute, stir for 50 minutes to fully mix all components evenly, thus obtaining an anti-ultraviolet type aging paint skin softener for large lacquer furniture.

[0045] Embodiment 2

[0046] A preparation method of an anti-ultraviolet type aging paint skin softener for large lacquer furniture includes:

[0047] In accordance with the above mass percentages, PEG-400, ethanol, and castor oil are sequentially added to a reaction vessel, with PEG-400 being 20 wt%, ethanol being 70 wt%, and castor oil being 10 wt%. The sum of the mass percentages of each component is 100%;

[0048] At a temperature of 20 - 25 °C, with a stirring speed of 200 revolutions per minute, stir for 30 minutes to fully mix all components evenly, thus obtaining an anti-ultraviolet type aging paint skin softener for large lacquer furniture.

[0049] Embodiment 3

[0050] A preparation method of an anti-ultraviolet type aging paint skin softener for large lacquer furniture includes:

[0051] In accordance with the above mass percentages, PEG-400, ethanol, and castor oil are sequentially added to a reaction vessel, with PEG-400 being 38 wt%, ethanol being 60 wt%, and castor oil being 2 wt%. The sum of the mass percentages of each component is 100%;

[0052] At a temperature of 20 - 25 °C, with a stirring speed of 250 revolutions per minute, stir for 30 minutes to fully mix all components evenly, thus obtaining an anti-ultraviolet type aging paint skin softener for large lacquer furniture.

[0053] Example 4

[0054] A preparation method of an anti-ultraviolet aging paint film softener for Chinese lacquer furniture, comprising:

[0055] In accordance with the above mass percentages, successively add PEG-400, ethanol, and castor oil into a reaction vessel, with PEG-400 being 35 wt%, ethanol being 60 wt%, and castor oil being 5 wt%, and the sum of the mass percentages of each component being 100%;

[0056] At a temperature of 20-25 °C, stir at a stirring speed of 150 revolutions per minute for 60 minutes to fully mix and homogenize each component, thereby obtaining an anti-ultraviolet aging paint film softener for Chinese lacquer furniture.

[0057] Example 5

[0058] A preparation method of an anti-ultraviolet aging paint film softener for Chinese lacquer furniture, comprising:

[0059] In accordance with the above mass percentages, successively add PEG-400, ethanol, and castor oil into a reaction vessel, with PEG-400 being 30 wt%, ethanol being 65 wt%, and castor oil being 5 wt%, and the sum of the mass percentages of each component being 100%;

[0060] At a temperature of 20-25 °C, stir at a stirring speed of 200 revolutions per minute for 45 minutes to fully mix and homogenize each component, thereby obtaining an anti-ultraviolet aging paint film softener for Chinese lacquer furniture.

[0061] Example 6

[0062] A preparation method of an anti-ultraviolet aging paint film softener for Chinese lacquer furniture, comprising:

[0063] In accordance with the above mass percentages, successively add PEG-400, ethanol, and castor oil into a reaction vessel, with PEG-400 being 35 wt%, ethanol being 64 wt%, and castor oil being 1 wt%, and the sum of the mass percentages of each component being 100%;

[0064] At a temperature of 20-25 °C, stir at a stirring speed of 200 revolutions per minute for 45 minutes to fully mix and homogenize each component, thereby obtaining an anti-ultraviolet aging paint film softener for Chinese lacquer furniture.

[0065] Example 7

[0066] A method for repairing the aging paint film of Chinese lacquer furniture, comprising the following steps:

[0067] (1) Pre-treatment of lacquer skin: Select the naturally peeled or aged lacquer skin of large lacquer furniture in the Ming and Qing dynasties. First, gently wipe the surface of the lacquer skin with a soft cloth dipped in diluted alcohol (the volume ratio of alcohol to water is 1:1) to remove dirt, dust and impurities, and then air dry naturally;

[0068] (2) Application of repair material: Use a brush tool to evenly apply the softening agent prepared in Examples 1-6 on the surface of the pre-treated lacquer skin to ensure that the surface of the lacquer skin is completely covered. The dosage of the softening agent is 30 times the mass of the lacquer skin;

[0069] (3) Synergistic stage of ultraviolet treatment and softening treatment: Place the lacquer skin coated with the softening agent in a device that can accurately control the ultraviolet irradiation intensity, irradiation time and treatment temperature; use a constant temperature and humidity ultraviolet treatment box, with an ultraviolet irradiation intensity of 200 W / m 2 , an irradiation time of 6 h, and a treatment temperature of 45 °C; at the same time, during this process, keep the ambient temperature at 18-22 °C to allow the softening agent to fully penetrate into the interior of the lacquer skin to achieve softening of the lacquer skin;

[0070] (4) Curing and post-treatment: After completing the ultraviolet treatment and softening process, place the lacquer skin in a closed environment for 24 h of curing treatment, and then take out the lacquer skin. Place the lacquer skin in a well-ventilated place with a temperature of 20-25 °C and a relative humidity of 40%-60% to air dry for 5-10 days to dry and cure the repair material on the surface of the lacquer skin; after drying and curing, perform further backfilling, grinding, polishing and spraying treatment on the lacquer skin to restore the gloss and texture of the lacquer skin.

[0071] Table 1 Data table of orthogonal test on ultraviolet absorption performance

[0072]

[0073] As can be seen from Table 1, the anti-ultraviolet type softening agent for aged lacquer skin of large lacquer furniture prepared in Example 5 has the optimal ratio, and the ultraviolet absorption coefficient is 0.839.

[0074] Figure 1The influence of softeners on the color difference of aged lacquer skins in Examples 1 to 6 shown. As can be seen from the figure, the color difference of the aged lacquer skins after softening is significantly improved. The color difference of the aged lacquer skins after softening decreases from 30.8 to 26.5, 22.7, 23.1, 23.8, 22.2, 24.3. After the analysis of the softener test, it shows that the appearance color of the aged lacquer skins is significantly improved. PEG-400 penetrates into the interior of the aged lacquer skin blocks to produce a swelling effect, making the compact structure become loose, laying the foundation for improving color uniformity. Castor oil acts as a plasticizer, filling the aging gaps of the lacquer skin to make the surface flat, reducing the color difference caused by uneven light reflection and refraction, and cooperating with other reagents to optimize the color performance. Ethanol, as a solvent, helps PEG and castor oil to penetrate, and its volatile characteristics regulate the internal component distribution, making the factors affecting color tend to be balanced after softening, achieving a reduction in the color difference. Although there are fluctuations in the measured color difference, the mixed reagent softening method has an obvious effect on improving the color of the aged lacquer skins, and the softener for the anti-ultraviolet large lacquer furniture aged lacquer skin prepared in Example 5 is the best ratio.

[0075] Figures 2 to 4 The physical pictures of the large lacquer furniture before and after restoration are shown. As can be seen from the figure, the aged lacquer skins are significantly improved after softening, and the restored large lacquer furniture can be stored stably for a long time, restoring and protecting its historical and cultural value to the greatest extent.

[0076] Traditional repair materials for the lacquer skins of large lacquer furniture often contain harmful substances such as phthalate plasticizers and benzophenone ultraviolet absorbers, posing a threat to human health and the environment. However, the components such as PEG-400, castor oil and ethanol used in the present invention have good biocompatibility and biodegradability. After detection, during the repair process using the repair materials of the present invention, the volatile amount of harmful substances in the air is almost zero, and it has no adverse effect on the health of the operators.

[0077] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those skilled in the art of this technology, the improvements and transformations obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An anti-ultraviolet type lacquer furniture aging paint softener, characterized in that: Including polyethylene glycol (PEG), ethanol and castor oil, the mass percentage of each component is: 20-40 wt% of polyethylene glycol, 55-70 wt% of ethanol and 1-10 wt% of castor oil, the sum of the mass percentages of the components is 100%.

2. The anti-ultraviolet type lacquer furniture aging paint softener according to claim 1, characterized in that: The polyethylene glycol is PEG-400.

3. The method for preparing a UV-proof lacquer furniture aging paint softener according to claim 1, characterized in that: include: According to the above mass percentages, polyethylene glycol, ethanol and castor oil are added to the reaction container in sequence; The mixed solution is stirred at a predetermined temperature to make all components fully and evenly mixed, so as to obtain an anti-ultraviolet lacquer furniture aged paint leather softener.

4. The method for preparing a UV-proof lacquer furniture aging paint softener according to claim 3, characterized in that: At a temperature of 20-25°C, stir at a stirring speed of 150-250 rpm for 30-60 minutes.

5. The use of the anti-ultraviolet type lacquer furniture aged paint softener according to any one of claims 1 to 4, characterized in that: It is used in the repair process of aged paint leather on lacquer furniture.

6. The application of the anti-ultraviolet type lacquer furniture aging paint softener according to claim 5, characterized in that: The repair process of aging lacquer furniture is as follows: (1) Pretreatment of lacquer leather: Select the naturally fallen or aged lacquer leather of lacquer furniture from the Ming and Qing dynasties, first wipe the surface of the lacquer leather gently with a soft cloth dipped in diluted alcohol to remove dirt, dust and impurities, and then let it dry naturally; (2) Applying the repair material: Use a brush to evenly apply the prepared softener on the pre-treated surface of the paint to ensure that the surface of the paint is completely covered; (3) UV treatment and softening treatment synergistic stage: the patent leather coated with softener is placed in a device that can accurately control the UV irradiation intensity, irradiation time, and treatment temperature; (4) Curing and post-treatment: After the UV treatment and softening process, the paint is placed in a closed environment for curing for 0.5 to 36 hours, then the paint is taken out and air-dried to allow the repair material on the surface of the paint to dry and solidify.

7. The use of the anti-ultraviolet type lacquer furniture aging paint softener according to claim 6, characterized in that: In step (1), in the diluted alcohol, the volume ratio of alcohol to water is 1:1 to 3.

8. The use of the anti-ultraviolet type lacquer furniture aging paint softener according to claim 6, characterized in that: In step (2), the amount of softener used is 20 to 40 times the weight of the patent leather.

9. The use of the anti-ultraviolet type lacquer furniture aging paint softener according to claim 6, characterized in that: In step (3), a constant temperature and humidity ultraviolet treatment box is used, and the ultraviolet irradiation intensity is 50 to 200 W / m 2 , irradiation time 1 to 12 hours, treatment temperature 25 to 55°C; at the same time, during this process, maintain the ambient temperature at 18 to 22°C to allow the softener to fully penetrate into the interior of the paint leather to achieve softening of the paint leather.

10. The use of the anti-ultraviolet type lacquer furniture aging paint softener according to claim 6, characterized in that: In step (4), the patent leather is placed in a well-ventilated place with a temperature of 20 to 25° C. and a relative humidity of 40% to 60% to air-dry for 5 to 10 days.

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