Antibacterial agent, preparation process and preparation process of antibacterial decorative paper

Abstract

The invention belongs to the technical field of new materials, and discloses an antibacterial agent, a preparation process and a preparation process of antibacterial decorative paper.The antibacterial agent is prepared from 40-50 parts of tea polyphenol and 20-50 parts of abelmoschus manihot gum. The antibacterial agent prepared by selecting tea polyphenol as a main antibacterial substance is applied to an impregnation process of impregnated bond paper of a veneer artificial board, the veneer artificial board is endowed with spectral antibacterial performance, and compared with chemical synthetic antibacterial agents and metal antibacterial agents, the antibacterial agent has the characteristics of high efficiency, safety, no toxicity and lasting antibacterial property. The antibacterial agent provided by the invention has excellent uniform dispersibility in melamine glue, UV paint and water-based paint, and the original production process of facing artificial boards and wood floors is not changed. According to the test standard of JC / T2039-2010 antibacterial mildew-proof wooden decorative sheet, the antibacterial performance of the product on staphylococcus aureus and escherichia coli can easily reach more than 99.99%, and the antibacterial durability of the product after 5000 times of washing is also more than 99.99%.

Description

Technical Field

[0001] The invention belongs to the technical field of new materials, and particularly relates to an antibacterial agent, a preparation process and a preparation process of antibacterial decorative paper. Background Art

[0002] As people pay more and more attention to the health of the home environment, the demand for antibacterial properties of veneer panels, wooden floors, and water-based paint furniture has become stronger. Taking veneer panels as an example, common veneer panels are made by hot pressing the surface of the board with impregnated film paper. They are moisture-proof and wear-resistant, with diverse styles, economical and practical, and are widely used in panel furniture. In order to give veneer panels antibacterial properties, antibacterial agents need to be added during the production process of veneer panels. According to different effective ingredients, they can be roughly divided into natural antibacterial agents, organic antibacterial agents, and inorganic antibacterial agents. Natural antibacterial agents are widely used in daily cosmetics and medicines, and have the advantages of safety and non-toxicity. Organic antibacterial agents have the effect of inhibiting and killing harmful bacteria and molds, and have the functions of bactericides, preservatives, and mildew inhibitors. However, organic bactericides generally have problems such as poor chemical stability, easy hydrolysis, toxicity, and poor bactericidal durability. Inorganic bactericides have the advantages of heat resistance, safety, and durability. Metal ion inorganic bactericides are generally more expensive and have a limited application range. Photocatalytic antibacterial agents must have oxygen, water, and light to work, and are limited in indoor home environments. Therefore, it is necessary to research and develop a natural antibacterial agent that can be used in the production process of veneer panels to give veneer panels efficient, safe, and non-toxic antibacterial properties. Summary of the invention

[0003] The purpose of the present invention is to provide an antibacterial agent with high efficiency, safety and non-toxic effects.

[0004] The above technical purpose of the present invention is achieved through the following technical scheme: an antibacterial agent, the raw materials include the following components by weight: 40-50 parts of tea polyphenols and 20-50 parts of hibiscus gum.

[0005] By adopting the above technical scheme, tea polyphenols is a general term for polyphenols in tea, which is a white amorphous powder and is easily soluble in water. The main components of tea polyphenols are 6 types of compounds: flavanones, anthocyanidins, flavonols and anthocyanidins, phenolic acid and phenolic acid. In the prior art, tea polyphenols have the characteristics of anti-oxidation, spectrum antibacterial and hygroscopicity. They are often used as antioxidants, food preservatives and food deodorants in the food industry, and are often used as antioxidants and antibacterial agents in the field of daily necessities. In the field of medicine, they are also generally used for anti-oxidation, blood lipid regulation, antibacterial and other effects.

[0006] Tea polyphenols is a natural and safe antibacterial agent. Theoretically, it is an ideal wood antibacterial agent. However, there are still many obstacles in practical application. In the prior art, there are few research documents on tea polyphenols as wood antibacterial agents. Generally, wood is soaked in a tea polyphenol solution and adsorbed and contained by the pore structure in the wood. Although the wood itself can be given antibacterial properties, the surface of the wood is treated during the process of processing the wood into furniture, such as painting, hot pressing decorative paper, etc., and the surface of the finished furniture basically has no antibacterial properties. Studies have attempted to add tea polyphenols as an antibacterial agent to wood adhesives to give wood products antibacterial properties. However, tea polyphenols have an acidic pH and have active groups such as hydroxyl groups, which can easily affect the curing of resins in wood adhesives. For example, studies have shown that tea polyphenols are directly added to urea-formaldehyde resin adhesives to prepare antibacterial plywood, but tea polyphenols directly cause the adhesive to cure prematurely and lose bonding strength. The inventors discovered during the process of researching and developing veneer artificial board products that when tea polyphenols were added to impregnating glue (melamine glue) to prepare antibacterial impregnating glue, and the antibacterial impregnating glue was used to impregnate impregnating glue film paper and then hot-pressed, the tea polyphenols significantly affected the curing strength of the impregnating glue, resulting in a significant decrease in the surface bonding strength of the veneer artificial board, making it impossible to prepare qualified veneer artificial board products.

[0007] After research and multiple tests, the inventors chose to compound tea polyphenols with hibiscus gum, which is a natural substance extracted from the rhizomes of hibiscus. Hibiscus gum is generally used as food glue, is a light yellow powder, and is viscous liquid when dissolved in water. Hibiscus gum coats tea polyphenols to a certain extent, separates active groups such as hydroxyl groups of tea polyphenols, and effectively reduces the influence of tea polyphenols on the curing process of melamine glue, which can not only give the surface of the veneer artificial board spectral antibacterial properties, but also will not significantly reduce the bonding strength between the veneer film paper and the board of the veneer artificial board, so as to obtain a qualified veneer artificial board.

[0008] The present invention is further configured as follows: the raw materials include 20-50 parts of hibiscus gum.

[0009] The present invention is further configured as follows: the raw material further comprises 5-30 parts of Ulva extract.

[0010] By adopting the above technical scheme, the Ulva extract is a substance extracted from the Ulva, including polysaccharides, alcohols, etc. The Ulva extract itself has antibacterial ability, which can further enhance the antibacterial efficacy of the antibacterial agent. At the same time, the aqueous solution of the Ulva extract is alkaline. As a natural, non-toxic and harmless pH regulator, it can adjust and control the pH of the antibacterial agent in the range of 5-7, avoid the antibacterial agent pH is too low to affect the curing of melamine glue, and promote the maintenance of the bonding strength of the veneer artificial board. At the same time, the prepared antibacterial agent can not only be used in melamine glue, but also can be used as an antibacterial additive in UV paint, coating, and water paint.

[0011] The present invention is further configured as follows: the raw material also includes water, and the total solid content of the antibacterial agent is ≥17%.

[0012] By adopting the above technical solution, the antibacterial agent of the finished product of the present invention needs to control the total solid content to be ≥17%, and can be used directly without changing the original production process of the veneer artificial board.

[0013] The present invention is further configured as follows: the pH range of the antibacterial agent is between 5-7.

[0014] The present invention is further configured as follows: the viscosity of the antibacterial agent is 2-10 mPa.s.

[0015] By adopting the above technical solution, the viscosity of the antibacterial agent is controlled at 2-10mPa.s, ensuring stable and controllable product quality.

[0016] The second object of the present invention is to provide a process for preparing the above antibacterial agent, comprising the following steps: S1, weighing tea polyphenols and dissolving them in water to obtain liquid 1, weighing hibiscus gum and dissolving them in water to obtain liquid 2, and weighing ulva extract and dissolving them in water to obtain liquid 3; S2, slowly add liquid 2 into liquid 1, stir for 10-15 minutes, let stand for 1-1.5 hours, repeat 3-5 times to obtain a mixed liquid; S3, adding the liquid into the mixed liquid of step S2 for three or more times, stirring for 20-30 minutes, standing for 1 hour, repeating 5-8 times to obtain an antibacterial agent.

[0017] By adopting the above technical scheme, the present invention first prepares tea polyphenols and water into liquid 1, and prepares hibiscus gum and water into liquid 2. Through multiple stirring and static treatment of liquid 1 and liquid 2, hibiscus gum can fully cover and isolate the active groups in tea polyphenols to reduce the influence on the curing of melamine glue. One of the functions of the Ulva extract is to control pH and total solid content. By appropriately increasing the pH of the antibacterial agent, it is avoided that too low pH affects the curing of melamine glue. By controlling parameters such as total solid content and viscosity, the quality and efficacy of the produced antibacterial agent product are stable and reliable.

[0018] The present invention is further configured as follows: in step S2 and step S3, the temperature of the feed liquid is controlled at 25-30° C. during the stirring and standing process.

[0019] By adopting the above technical solution, the temperature of steps S2 and S3 in the production process is controlled at 25-30°C to avoid insufficient reaction under low temperature conditions and ensure the reliable quality of the antibacterial agent product.

[0020] The present invention is further configured as follows: in step S3, during the process of adding the feed solution three, the pH range is controlled to be 5-7, and the total solid content is controlled to be 17% or more.

[0021] The third object of the present invention is to provide a process for preparing antibacterial decorative paper, comprising the following steps: One-time impregnation: take the decorative paper and immerse it in the impregnation glue for a period of time, then take it out; Preparation of antibacterial impregnated adhesive, adding the antibacterial agent according to any one of claims 1 to 6 to melamine adhesive, the mass ratio of the antibacterial agent to the melamine adhesive being 0.5:100, mechanically stirring for at least 5 minutes, to obtain the antibacterial impregnated adhesive; Secondary impregnation: the decorative paper after the primary impregnation is impregnated with the antibacterial impregnation glue for a period of time and then taken out to obtain the antibacterial decorative paper.

[0022] By adopting the above technical scheme, the antibacterial agent of the present invention does not change the original production process of the veneer wood-based panel during application. In the secondary impregnation step, the antibacterial agent and melamine glue are mechanically stirred in advance to obtain the glue solution used for the secondary impregnation. The rest of the process does not need to be changed at all, which is conducive to the promotion and application of the antibacterial agent.

[0023] The beneficial effects of the present invention are: 1. The present invention uses tea polyphenols as the main antibacterial substance to prepare the antibacterial agent, which is applied in the impregnation process of the impregnated film paper of the veneer artificial board to give the veneer artificial board a spectral antibacterial property. Compared with chemical synthetic antibacterial agents and metal antibacterial agents, the antibacterial agent of the present invention has the characteristics of high efficiency, safety, non-toxicity and long-lasting antibacterial.

[0024] 2. The antibacterial agent of the present invention has excellent uniform dispersion in melamine glue, UV paint and water-based paint, and does not change the original production process of veneer artificial board and wood floor. According to the test standard of JC / T2039-2010 "Antibacterial and Mildew-proof Wood Decorative Board", the antibacterial performance against Staphylococcus aureus and Escherichia coli can easily reach >99.99%, and the antibacterial durability of the product after 5,000 washes is also >99.99%.

[0025] 3. Aiming at the technical obstacle that tea polyphenols affect the curing of wood adhesives and reduce the bonding strength, the present invention uses hibiscus gum and tea polyphenols to coat and separate the active groups in tea polyphenols, effectively reducing the influence on the curing of melamine glue. At the same time, the Ulva extract can not only further enhance the antibacterial performance, but also serve as a natural pH regulator to appropriately improve the acidity of the antibacterial agent, further reduce the influence of the antibacterial agent on melamine glue, UV paint, and water-based paint, and overcome the technical obstacle of tea polyphenols in the application of wood adhesives.

[0026] 4. The raw materials of the antibacterial agent of the present invention are all natural substances, safe and non-toxic, low in cost, and conducive to creating a safe and healthy home environment. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] Example 1: An antibacterial agent, comprising 40 parts of tea polyphenols, 20 parts of hibiscus gum, and 5-30 parts of ulvae extract, by weight. The preparation process comprises the following steps: S1, weigh tea polyphenols and dissolve them in an appropriate amount of water to obtain liquid 1. Weigh hibiscus gum and dissolve them in an appropriate amount of water to obtain liquid 2, and weigh ulva extract and dissolve them in an appropriate amount of water to obtain liquid 3. The temperatures of liquids 1, 2, and 3 are controlled at 25-30°C.

[0029] S2, slowly add liquid 2 into liquid 1, stir for 10 minutes, let stand for 1.5 hours, repeat 3 times to obtain a mixed liquid, wherein the temperature of the liquid is controlled at 25-30°C during the stirring and standing process.

[0030] S3, adding the feed liquid to the mixed feed liquid of step S2 for three times, stirring for 30 minutes, standing for 1 hour, repeating 8 times, to obtain an antibacterial agent, controlling the pH range of the antibacterial agent to be between 5-7, the viscosity to be between 2-10mPa.s, the total solid content to be 17% or more, and the density to be between 1.0-1.2g / mL. Wherein, the feed liquid temperature is controlled at 25-30°C during the stirring and standing process.

[0031] The production process of applying antimicrobial agents to veneer wood-based panels includes the following steps: For one-time impregnation, take the impregnated film paper and immerse it in the impregnating glue (melamine glue) for 20 minutes.

[0032] The antibacterial impregnated glue was prepared by adding the antibacterial agent into the melamine glue, with the mass ratio of the antibacterial agent to the melamine glue being 0.5:100, and mechanically stirring for at least 5 minutes to obtain the antibacterial impregnated glue.

[0033] Secondary impregnation: the decorative paper after the primary impregnation is impregnated with the antibacterial impregnation glue for 30 minutes and then taken out to obtain the antibacterial decorative paper.

[0034] The antibacterial decorative paper after the secondary impregnation was hot pressed on the particle board under the process conditions of 1.3 MPa, 140°C and hot pressing for 40 seconds.

[0035] Example 2: An antibacterial agent, comprising, by weight: 50 parts of tea polyphenols, 40 parts of hibiscus gum, and 5-30 parts of ulvae extract. The preparation process comprises the following steps: S1, weigh tea polyphenols and dissolve them in an appropriate amount of water to obtain liquid 1. Weigh hibiscus gum and dissolve them in an appropriate amount of water to obtain liquid 2, and weigh ulva extract and dissolve them in an appropriate amount of water to obtain liquid 3. The temperatures of liquids 1, 2, and 3 are controlled at 28-30°C.

[0036] S2, slowly add liquid 2 into liquid 1, stir for 15 minutes, let stand for 1.5 hours, repeat 5 times to obtain a mixed liquid, wherein the liquid temperature is controlled at 28-30°C during the stirring and standing process.

[0037] S3, adding the feed liquid to the mixed feed liquid of step S2 for three times, stirring for 30 minutes, standing for 1 hour, repeating 5 times, to obtain an antibacterial agent, controlling the pH range of the antibacterial agent to be between 5-7, the viscosity to be between 2-10mPa.s, the total solid content to be 17% or more, and the density to be between 1.0-1.2g / mL. Wherein, the feed liquid temperature is controlled at 28-30°C during the stirring and standing process.

[0038] The production process of applying antimicrobial agents to veneer wood-based panels includes the following steps: For one-time impregnation, take the impregnated film paper and immerse it in the impregnating glue (melamine glue) for 20 minutes.

[0039] The antibacterial impregnated glue was prepared by adding the antibacterial agent into the melamine glue, with the mass ratio of the antibacterial agent to the melamine glue being 0.5:100, and mechanically stirring for at least 5 minutes to obtain the antibacterial impregnated glue.

[0040] Secondary impregnation: the decorative paper after the primary impregnation is impregnated with the antibacterial impregnation glue for 30 minutes and then taken out to obtain the antibacterial decorative paper.

[0041] The antibacterial decorative paper after the secondary impregnation was hot pressed on the particle board under the process conditions of 1.3 MPa, 140°C and hot pressing for 40 seconds.

[0042] Comparative Example 1: An antibacterial agent comprising tea polyphenols and an appropriate amount of water, which are stirred evenly. The ratio of tea polyphenols to water is consistent with the liquid in step S1 of Example 1.

[0043] The production process of applying antimicrobial agents to veneer wood-based panels includes the following steps: For one-time impregnation, take the impregnated film paper and immerse it in the impregnating glue (melamine glue) for 20 minutes.

[0044] The antibacterial impregnated glue was prepared by adding the antibacterial agent into the melamine glue, with the mass ratio of the antibacterial agent to the melamine glue being 0.5:100, and mechanically stirring for at least 5 minutes to obtain the antibacterial impregnated glue.

[0045] Secondary impregnation: the decorative paper after the primary impregnation is impregnated with the antibacterial impregnation glue for 30 minutes and then taken out to obtain the antibacterial decorative paper.

[0046] The antibacterial decorative paper after the secondary impregnation was hot pressed on the particle board under the process conditions of 1.3 MPa, 140°C and hot pressing for 40 seconds.

[0047] Comparative Example 2: A production process for a veneer artificial board, comprising the following steps: For one-time impregnation, take the impregnated film paper and immerse it in the impregnating glue (melamine glue) for 20 minutes.

[0048] Secondary impregnation: the decorative paper after the primary impregnation is impregnated with impregnating glue (melamine glue) for 30 minutes and then taken out to obtain the decorative paper.

[0049] The secondary impregnated decorative paper was hot pressed onto the particle board under the process conditions of 1.3 MPa, 140° C., and hot pressing for 40 seconds.

[0050] Experimental Section Antibacterial performance test: Taking the veneer artificial board of Example 1-2, according to the test standard of JC / T2039-2010 "Antibacterial and Mildew-proof Wood Decorative Board", the antibacterial performance of the veneer artificial board of Example 1-2 against Staphylococcus aureus and Escherichia coli can easily reach >99.99%, and the antibacterial durability of the product after 5000 washes is also >99.99%.

[0051] For the surface bonding strength test, the veneer wood-based panel specimen was placed in the fixture of a universal mechanical testing machine, and an appropriate loading speed was selected and loaded at a constant speed, so that the specimen was destroyed within 60±30s, and the maximum load value was recorded. The surface bonding strength of the veneer wood-based panels of Examples 1-2 and Comparative Examples 1-2 was tested, and 6 test samples were taken for each Example / Comparative Example, and the average value was taken, and the test results were listed in the following Table 1.

[0052] Table 1 Surface bonding strength test results Group Surface bonding strength of veneer wood-based panels / MPa Example 1 0.69 Example 2 0.70 Comparative Example 1 0.12 Comparative Example 2 0.72 The test results in Table 1 show that the surface bonding strength of Examples 1-2 is slightly lower than that of Comparative Example 2, but the difference is not large, indicating that the antibacterial agent of the present invention has little effect on the curing of melamine glue after being added to melamine glue. The bonding strength of Comparative Example 1 is significantly lower than that of Examples 1-2 and Comparative Example 2, indicating that tea polyphenols have an effect on the curing and bonding strength of melamine glue.

Claims

1. An antibacterial agent, characterized in that: The raw materials include the following components by weight: 40-50 parts of tea polyphenols and 20-50 parts of hibiscus gum.

2. An antibacterial agent according to claim 1, characterized in that: The raw materials include 20-50 parts of hibiscus gum.

3. An antibacterial agent according to claim 1 or 2, characterized in that: The raw material also includes 5-30 parts of Ulva extract.

4. An antibacterial agent according to claim 1, characterized in that: The raw materials also include water, and the total solid content of the antibacterial agent is ≥17%.

5. An antibacterial agent according to claim 1, characterized in that: The pH range of antimicrobial agents is between 5-7.

6. An antibacterial agent according to claim 1, characterized in that: The viscosity of the antibacterial agent is 2-10mPa.s.

7. A process for preparing an antibacterial agent according to any one of claims 1 to 6, characterized in that: The following steps are included: S1, weighing tea polyphenols and dissolving them in water to obtain liquid 1, weighing hibiscus gum and dissolving them in water to obtain liquid 2, and weighing ulva extract and dissolving them in water to obtain liquid 3; S2, slowly add liquid 2 into liquid 1, stir for 10-15 minutes, let stand for 1-1.5 hours, repeat 3-5 times to obtain a mixed liquid; S3, adding the liquid into the mixed liquid of step S2 for three or more times, stirring for 20-30 minutes, standing for 1 hour, repeating 5-8 times to obtain an antibacterial agent.

8. The process for preparing an antibacterial agent according to claim 7, characterized in that: In step S2 and step S3, the temperature of the liquid is controlled at 25-30° C. during stirring and standing.

9. The process for preparing an antibacterial agent according to claim 7, characterized in that: In step S3, during the addition of liquid three, the pH is controlled within a range of 5-7 and the total solid content is controlled within a range of 17% or more.

10. A process for preparing antibacterial decorative paper, characterized in that: The following steps are included: One-time impregnation: take the decorative paper and immerse it in the impregnation glue for a period of time, then take it out; Preparation of antibacterial impregnated adhesive, adding the antibacterial agent according to any one of claims 1 to 6 to melamine adhesive, the mass ratio of the antibacterial agent to the melamine adhesive being 0.5:100, mechanically stirring for at least 5 minutes, to obtain the antibacterial impregnated adhesive; Secondary impregnation: the decorative paper after the primary impregnation is impregnated with the antibacterial impregnation glue for a period of time and then taken out to obtain the antibacterial decorative paper.