Odor-removing and antiviral ecological board modified by using active substances of isatis root

Abstract

The invention relates to the technical field of preparation of ecological boards, in particular to a peculiar smell removing and virus resisting ecological board modified by using an isatis root active substance. Comprising the following components in parts by weight: 1 to 5 parts by weight of a modified molecular nest structure material, 95 to 100 parts by weight of pine wood, 6 to 12 parts by weight of an isocyanate adhesive, 10 to 15 parts by weight of melamine resin and the balance of decorative paper, the modified molecular nest structure material is obtained by performing surface modification on a mesoporous nano-silica material through maleic anhydride, impregnating an active component of radix isatidis and performing surface modification by using polylysine, and the active component of radix isatidis is attached into pores, so that the adhesive force of the active component of radix isatidis is enhanced, the active component is protected from being influenced by an external environment, and the service life of the material is prolonged. And meanwhile, the modified molecular nest structure material acts on the veneering melamine paper, so that the antibacterial property of the veneer material is improved, and the ecological board achieves the functions of mildew prevention, peculiar smell removal and virus resistance.

Description

Technical Field

[0001] The invention relates to the technical field of preparation of ecological boards, and in particular to an odor-removing and anti-viral ecological board modified with Radix Isatidis active substances. Background Art

[0002] Isatis root is a commonly used Chinese medicinal material, mainly derived from the dried roots of the cruciferous plant Isatis indigotica. It contains a variety of active ingredients, including indigo carmine, isatis root saponins and isatis root polysaccharides. These ingredients have multiple pharmacological effects such as antiviral, antibacterial and anti-inflammatory. In traditional Chinese medicine, isatis root is often used to treat symptoms such as wind-heat colds, sore throats, and mouth ulcers.

[0003] Ecological board, a building material, has many names in the industry. Common names include paint-free board and melamine board. With people's increasing attention to indoor air quality, ecological board is widely used in home decoration and construction industry as an environmentally friendly building material. However, the existing ecological board has a relatively simple structure and function. During use, it is easy to breed bacteria and mildew on the one hand, and produce certain odor on the other hand. In view of this, the odor-removing and antiviral ecological board modified with isatis root active substance is provided. Summary of the invention

[0004] The purpose of the present invention is to provide an odor-removing and antiviral ecological board modified with Radix Isatidis active substances, so as to solve the problems of the ecological board proposed in the above background technology that is easy to breed bacteria, mildew and have a strong odor.

[0005] To achieve the above-mentioned purpose, the purpose of the present invention is to provide an odor-removing and antiviral ecological board modified with isatis root active substances, comprising the following components in parts by weight: comprising the following components in parts by weight: 1-5 parts by weight of modified molecular nest structure material, 95-100 parts by weight of pine wood, 6-12 parts by weight of isocyanate adhesive and 10-15 parts by weight of melamine resin, and the rest is decorative paper, wherein the modified molecular nest structure material is obtained by surface-modifying mesoporous nano-silica material with maleic anhydride, impregnating isatis root active components, and then surface-modifying with polylysine.

[0006] As a further improvement of the technical solution, the specific preparation method of the modified molecular nest structure material is as follows:

[0007] S1.1. Select fresh or dried Radix Isatidis as raw material, remove impurities, clean and crush into coarse powder, use dryer to dry at 50-80°C, add 55-65% ethanol solution to the crushed Radix Isatidis powder, heat and reflux at 50-60°C for 1-2h, filter the extract through filter paper, collect the filtrate, and then use rotary evaporator under 200-300mmHg reduced pressure to concentrate the filtrate to dryness, control the temperature at 35-40°C, finally place the extract in an oven, dry at 50-60°C to constant weight, and obtain the active component of Radix Isatidis;

[0008] S1.2, dispersing the mesoporous nano-silica material in anhydrous ethanol solvent, stirring evenly with a magnetic stirrer, then adding maleic anhydride, setting the heating temperature to 70-80°C, and the reaction time to 1-2h. After the reaction is completed, separating the surface-modified mesoporous nano-silica by filtration, washing it with anhydrous ethanol solvent for 1-3 times, and drying it in an oven at 80-100°C for 12-24h to obtain mesoporous nano-silica surface-modified with maleic anhydride;

[0009] S1.3, dissolving the active component of Radix Isatidis in anhydrous ethanol solvent, then adding mesoporous nano-silica surface-modified by maleic anhydride, heating in a water bath at 45-55°C for 2-4h for encapsulation, washing with anhydrous ethanol solvent, and drying at 60-80°C to obtain mesoporous nano-silica encapsulating the active component, i.e., a molecular nest structure material;

[0010] S1.4. Place the molecular nest structure material in a polylysine solution, stir continuously to form a uniformly dispersed suspension, react at room temperature for 1-2 hours, filter and dry to obtain a modified molecular nest structure material.

[0011] As a further improvement of the technical solution, the mass of the maleic anhydride is 2-6% of the mass of the mesoporous nano-silica.

[0012] The silica of mesoporous nano-silica is non-toxic, has a highly ordered hexagonal pore structure, good chemical stability, and is easy to surface-modify to enhance the interaction with active components. The pore size and shape of the mesoporous nano-silica material can be adjusted, and its pore structure can be used to selectively adsorb or separate specific molecules and control the release rate of active ingredients, thereby prolonging its antibacterial effect. It also has a large specific surface area, good pore structure and stability.

[0013] Maleic anhydride is also called maleic anhydride, with the molecular formula of C4H2O3, containing a four-membered ring with two carbonyl groups (C=O) and a double bond. This structure makes maleic anhydride have good reactivity and can undergo a variety of chemical reactions. Since the surface of silica contains a large number of hydroxyl groups (-OH), maleic anhydride can react with the hydroxyl groups on the surface of mesoporous nano-silica materials under mild conditions to generate carboxyl groups, and the carboxyl groups can further form amide bonds or ester bonds with the amino groups or hydroxyl groups in the active components of Radix Isatidis, thereby achieving surface modification of the mesoporous nano-silica materials.

[0014] As a further improvement of the technical solution, the mass ratio of the Radix Isatidis active components to the mesoporous nano-silica is 1:6-10.

[0015] The main active ingredients in Isatis root include indigoside, Isatis root saponin, etc. These ingredients have broad-spectrum antibacterial, antiviral and antioxidant activities, including Gram-positive bacteria such as Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus A, Streptococcus meningitidis, Neisseria gonorrhoeae, Coccus catarrhalis, Streptococcus pneumoniae, Haemophilus influenzae, Corynebacterium diphtheria, etc., Gram-negative bacteria such as Escherichia coli, Pseudomonas aeruginosa, Bacillus brevis, Bacillus subtilis, etc., influenza viruses such as influenza A virus (H3N2), influenza B virus, and enterovirus (EV71), etc.

[0016] As a further improvement of the technical solution, the concentration of the polylysine solution is 1-5 mg / mL.

[0017] Polylysine is a polypeptide polymer composed of L-lysine units with good biocompatibility and degradability. It has a highly positive charge because each lysine residue carries an amino side chain (-NH2). At physiological pH, these amino groups will be protonated to become positively charged -NH3+ groups. It is a cationic polymer. After mesoporous silica is modified with maleic anhydride, its surface will carry carboxylate ions (-COO-), which makes the modified mesoporous silica surface negatively charged and can interact electrostatically with positively charged substances. The positively charged polylysine can electrostatically attract the negatively charged modified mesoporous silica surface to form one or more covering layers. This electrostatic adsorption can enhance the adhesion of the active ingredients of Radix Isatidis, and polylysine has certain antibacterial activity, which can enhance the performance of mesoporous nanosilica as an antibacterial material. At this time, in the modified molecular nest structure material, the active components of Radix Isatidis are encapsulated in the pores of mesoporous silica, which helps to protect the active components from the influence of the external environment and control their release.

[0018] As a further improvement of the technical solution, the mass ratio of the polylysine solution to the mesoporous nano-silica is 1:8-10.

[0019] As a further improvement of the technical solution, the specific preparation method of the ecological board is as follows:

[0020] S2.1. Process pine wood to obtain shavings, dry them, and crush them into particles. Mix the modified molecular nest structure material with water to form a suspension, and evenly spray it on the pine wood particles. Then, evenly sprinkle the isocyanate adhesive on the wood particles, stir them evenly with a mixer, and then use a pre-pressing machine to preliminarily compress the mixed wood particles. The pre-pressing pressure is 1-2MPa, and the pre-pressing time is 30-60s. Put the pre-pressed wood particles into the mold of the hot press. The hot pressing temperature is 150-200℃, the hot pressing pressure is 3-7MPa, and the hot pressing time is 1-3min. After the hot pressing is completed, place the board on a cooling rack for natural cooling to obtain a modified plain board.

[0021] S2.2. Add the modified molecular nest structure material to the melamine resin and disperse it evenly by stirring. Immerse the decorative paper made of cellulose in the melamine resin solution containing the modified molecular nest structure material. Use a roller to squeeze out excess resin. Place the impregnated decorative paper on a drying rack to dry naturally. Then place the dried decorative paper in an oven for thermal curing at a curing temperature of 150-200°C and a curing time of 20-30 minutes. Attach the cured decorative paper to the prepared modified plain board and use a hot press to perform hot pressing bonding. The hot pressing molding temperature is 100-200°C, the hot pressing pressure is 1-5MPa, and the hot pressing time is 5-10 minutes. After veneer completion, trim the edges of the finished product to obtain an odor-removing and antiviral ecological board modified with Isatis indigotica active substances.

[0022] As a further improvement of the technical solution, 1% to 5% of the modified molecular nest structure material is added to the modified molecular nest structure material suspension.

[0023] As a further improvement of the technical solution, the particle diameter of the pine wood particles is 1-10 mm.

[0024] As a further improvement of the technical solution, the mass ratio of the Radix Isatidis powder to ethanol is 1:40-45.

[0025] Melamine resin is a thermosetting resin. Under heating conditions, melamine resin will undergo a cross-linking reaction to form a network structure, making the decorative paper hard and wear-resistant, and evenly distributing the antibacterial components in the mesoporous nano-silica on the surface of the decorative paper to provide antiviral function. During the curing process, a very hard surface can be formed after hot pressing, which has good wear resistance, water resistance and antibacterial properties. The polylysine molecular chain contains multiple lysine residues, each of which has a primary amine group. These primary amine groups can react with isocyanate groups to form urea formamide bonds (-NH-CO-NH-) to form a cross-linked structure. At the same time, polylysine can increase the interaction between mesoporous nano-silica and decorative paper fibers.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] In the deodorizing and antiviral ecological board modified with Radix Isatidis active substances, maleic anhydride is used to modify the surface of the mesoporous nano-silica material, the Radix Isatidis active components are impregnated, and then the surface is modified with polylysine to prepare the ecological board. The Radix Isatidis active components are attached to the pores by maleic anhydride, the adhesion of the Radix Isatidis components is enhanced, the active components are protected from the influence of the external environment, and the effect of slow release is achieved. At the same time, the modified molecular nest structure material acts on the veneer melamine paper, which improves the antibacterial property of the facing material, so that the ecological board can achieve the functions of mildew prevention, deodorization and antiviral. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0029] The odor-removing and anti-viral ecological board modified with Radix Isatidis active substances includes the following components in parts by weight: 1-5 parts by weight of modified molecular nest structure material, 95-100 parts by weight of pine wood, 6-12 parts by weight of isocyanate adhesive and 10-15 parts by weight of melamine resin, and the rest is decorative paper. The modified molecular nest structure material is obtained by surface-modifying mesoporous nano-silica material with maleic anhydride, impregnating the Radix Isatidis active components, and then surface-modifying with polylysine.

[0030] Example 1: In this example, the specific preparation method of the deodorizing and antiviral ecological board modified with Radix Isatidis active substances is as follows:

[0031] Prepare components: 1g of modified molecular nest structure material, 100g of pine wood, 6g of isocyanate adhesive and 15g of melamine resin, and the rest is decorative paper, wherein the mass of maleic anhydride is 4% of the mass of mesoporous nano-silica, the mass ratio of Radix Isatidis active component to mesoporous nano-silica is 1:10, the mass ratio of polylysine to mesoporous nano-silica is 1:8, the amount of modified molecular nest structure material added to the resin is 3% of the total amount of melamine resin; the mass ratio of Radix Isatidis powder to ethanol is 1:40;

[0032] S1.1. Select fresh or dried Radix Isatidis as raw material, remove impurities, clean and crush into coarse powder, use dryer to dry at 50°C, add 100g ethanol solution with a concentration of 55-65% to the crushed Radix Isatidis powder, heat and reflux at 60°C for 2h, filter the extract through filter paper, collect the filtrate, and then use a rotary evaporator under 200mmHg reduced pressure to concentrate the filtrate to dryness, control the temperature at 40°C, finally place the extract in an oven, dry at 60°C to constant weight, and obtain the active component of Radix Isatidis;

[0033] S1.2, disperse the mesoporous nano-silica material in 100 mL of anhydrous ethanol solvent, stir evenly with a magnetic stirrer, then add maleic anhydride, set the heating temperature to 80°C, and the reaction time to 2 hours. After the reaction is completed, separate the surface-modified mesoporous nano-silica by filtration, wash it once with anhydrous ethanol solvent, and dry it in an oven at 100°C for 12 hours to obtain mesoporous nano-silica surface-modified by maleic anhydride;

[0034] S1.3, dissolving the active component of Radix Isatidis in 100 mL of anhydrous ethanol solvent, then adding mesoporous nano-silica surface-modified by maleic anhydride, heating in a water bath at 45°C for 2 h for encapsulation, washing with anhydrous ethanol solvent, and drying at 80°C to obtain mesoporous nano-silica encapsulating the active component, i.e., a molecular nest structure material;

[0035] S1.4, placing the molecular nest structure material in a 1 mg / mL polylysine solution, stirring continuously to form a uniformly dispersed suspension, reacting at room temperature for 1 hour, filtering and drying to obtain a modified molecular nest structure material;

[0036] S2.1. Process pine wood to obtain shavings, dry them, and crush them into particles. Mix the modified molecular nest structure material with water to form a suspension, and evenly spray it on the pine wood particles. Then, evenly sprinkle the isocyanate adhesive on the wood particles, stir them evenly with a mixer, and then use a pre-pressing machine to preliminarily compress the mixed wood particles. The pre-pressing pressure is 1MPa and the pre-pressing time is 30s. Put the pre-pressed wood particles into the mold of the hot press. The hot pressing temperature is 150°C, the hot pressing pressure is 7MPa, and the hot pressing time is 3min. After the hot pressing is completed, place the board on a cooling rack for natural cooling to obtain a modified plain board.

[0037] S2.2. Add the modified molecular nest structure material to the melamine resin, stir to make it evenly dispersed, immerse the decorative paper in the melamine resin solution containing the modified molecular nest structure material, use a roller to squeeze out excess resin, place the impregnated decorative paper on a drying rack to dry naturally, and then place the dried decorative paper in an oven for thermal curing at a curing temperature of 200°C and a curing time of 30 minutes. Attach the cured decorative paper to the prepared modified plain board and use a hot press to perform hot pressing bonding at a hot pressing molding temperature of 200°C, a hot pressing pressure of 5MPa, and a hot pressing time of 10 minutes. After veneer completion, trim the edges of the finished product to obtain an odor-removing and antiviral ecological board modified with Isatis indigotica active substances.

[0038] Example 2: In this example, the specific preparation method of the deodorizing and antiviral ecological board modified with Radix Isatidis active substances is as follows:

[0039] Prepare the following components: 3g of modified molecular nest structure material, 100g of pine wood, 6g of isocyanate adhesive and 15g of melamine resin, and the rest is decorative paper, wherein the mass of maleic anhydride is 4% of the mass of mesoporous nano-silica, the mass ratio of Radix Isatidis active component to mesoporous nano-silica is 1:10, the mass ratio of polylysine to mesoporous nano-silica is 1:8, and the amount of modified molecular nest structure material added to the resin is 3% of the total amount of melamine resin;

[0040] S1.1. Select fresh or dried Radix Isatidis as raw material, remove impurities, clean and crush into coarse powder, use dryer to dry at 50°C, add 100g ethanol solution with a concentration of 55-65% to the crushed Radix Isatidis powder, heat and reflux at 60°C for 2h, filter the extract through filter paper, collect the filtrate, and then use a rotary evaporator under 200mmHg reduced pressure to concentrate the filtrate to dryness, control the temperature at 40°C, finally place the extract in an oven, dry at 60°C to constant weight, and obtain the active component of Radix Isatidis;

[0041] S1.2, disperse the mesoporous nano-silica material in 100 mL of anhydrous ethanol solvent, stir evenly with a magnetic stirrer, then add maleic anhydride, set the heating temperature to 80°C, and the reaction time to 2 hours. After the reaction is completed, separate the surface-modified mesoporous nano-silica by filtration, wash it once with anhydrous ethanol solvent, and dry it in an oven at 100°C for 12 hours to obtain mesoporous nano-silica surface-modified by maleic anhydride;

[0042] S1.3, dissolving the active component of Radix Isatidis in 100 mL of anhydrous ethanol solvent, then adding mesoporous nano-silica surface-modified by maleic anhydride, heating in a water bath at 45°C for 2 h for encapsulation, washing with anhydrous ethanol solvent, and drying at 80°C to obtain mesoporous nano-silica encapsulating the active component, i.e., a molecular nest structure material;

[0043] S1.4, placing the molecular nest structure material in a 1 mg / mL polylysine solution, stirring continuously to form a uniformly dispersed suspension, reacting at room temperature for 1 hour, filtering and drying to obtain a modified molecular nest structure material;

[0044] S2.1. Process pine wood to obtain shavings, dry them, and crush them into particles. Mix the modified molecular nest structure material with water to form a suspension, and evenly spray it on the pine wood particles. Then, evenly sprinkle the isocyanate adhesive on the wood particles, stir them evenly with a mixer, and then use a pre-pressing machine to preliminarily compress the mixed wood particles. The pre-pressing pressure is 1MPa and the pre-pressing time is 30s. Put the pre-pressed wood particles into the mold of the hot press. The hot pressing temperature is 150°C, the hot pressing pressure is 7MPa, and the hot pressing time is 3min. After the hot pressing is completed, place the board on a cooling rack for natural cooling to obtain a modified plain board.

[0045] S2.2. Add the modified molecular nest structure material to the melamine resin, stir to make it evenly dispersed, immerse the decorative paper in the melamine resin solution containing the modified molecular nest structure material, use a roller to squeeze out excess resin, place the impregnated decorative paper on a drying rack to dry naturally, and then place the dried decorative paper in an oven for thermal curing at a curing temperature of 200°C and a curing time of 30 minutes. Attach the cured decorative paper to the prepared modified plain board and use a hot press to perform hot pressing bonding at a hot pressing molding temperature of 200°C, a hot pressing pressure of 5MPa, and a hot pressing time of 10 minutes. After veneer completion, trim the edges of the finished product to obtain an odor-removing and antiviral ecological board modified with Isatis indigotica active substances.

[0046] Example 3: In this example, the specific preparation method of the deodorizing and antiviral ecological board modified with Radix Isatidis active substances is as follows:

[0047] S3.1. Prepare the components: 5g of modified molecular nest structure material, 100g of pine wood, 6g of isocyanate adhesive and 15g of melamine resin, and the rest is decorative paper, wherein the mass of maleic anhydride is 4% of the mass of mesoporous nano-silica, the mass ratio of Radix Isatidis active component to mesoporous nano-silica is 1:10, the mass ratio of polylysine to mesoporous nano-silica is 1:8, and the amount of modified molecular nest structure material added to the resin is 3% of the total amount of melamine resin;

[0048] S3.2. Select fresh or dried Radix Isatidis as raw material, remove impurities, clean and crush into coarse powder, use dryer to dry at 50°C, add 100g ethanol solution with a concentration of 55-65% to the crushed Radix Isatidis powder, heat and reflux at 60°C for 2h, filter the extract through filter paper, collect the filtrate, and then use a rotary evaporator under 200mmHg reduced pressure to concentrate the filtrate to dryness, control the temperature at 40°C, finally place the extract in an oven, dry at 60°C to constant weight, and obtain the active component of Radix Isatidis;

[0049] S3.3, disperse the mesoporous nano-silica material in 100 mL of anhydrous ethanol solvent, stir evenly with a magnetic stirrer, then add maleic anhydride, set the heating temperature to 80°C, and the reaction time to 2 hours. After the reaction is completed, separate the surface-modified mesoporous nano-silica by filtration, wash it once with anhydrous ethanol solvent, and dry it in an oven at 100°C for 12 hours to obtain mesoporous nano-silica surface-modified by maleic anhydride;

[0050] S3.4, dissolving the active component of Radix Isatidis in 100 mL of anhydrous ethanol solvent, then adding mesoporous nano-silica surface-modified by maleic anhydride, heating in a water bath at 45°C for 2 h for encapsulation, washing with anhydrous ethanol solvent, and drying at 80°C to obtain mesoporous nano-silica encapsulating the active component, i.e., a molecular nest structure material;

[0051] S3.5, placing the molecular nest structure material in a 1 mg / mL polylysine solution, stirring continuously to form a uniformly dispersed suspension, reacting at room temperature for 1 hour, filtering and drying to obtain a modified molecular nest structure material;

[0052] S3.6, pine wood is processed to obtain shavings, dried, and crushed into particles, the modified molecular nest structure material is mixed with water to form a suspension, and evenly sprayed on the pine wood particles, and then the isocyanate adhesive is evenly sprinkled on the wood particles, and stirred evenly by a mixer, and then the mixed wood particles are preliminarily compressed by a pre-pressing machine, the pre-pressing pressure is 1MPa, the pre-pressing time is 30s, and the pre-pressed wood particles are placed in the mold of the hot press, the hot pressing molding temperature is 150°C, the hot pressing pressure is 7MPa, and the hot pressing time is 3min. After the hot pressing is completed, the board is placed on a cooling rack for natural cooling to obtain a modified plain board;

[0053] S3.7. Add the modified molecular nest structure material to the melamine resin, and disperse it evenly by stirring. Immerse the decorative paper in the melamine resin solution containing the modified molecular nest structure material, and use a roller to squeeze out excess resin. Place the impregnated decorative paper on a drying rack to dry naturally, and then place the dried decorative paper in an oven for thermal curing at a temperature of 200°C and a curing time of 30 minutes. Attach the cured decorative paper to the prepared modified plain board and use a hot press to perform hot pressing bonding at a hot pressing molding temperature of 200°C, a hot pressing pressure of 5MPa, and a hot pressing time of 10 minutes. After veneer formation, trim the edges of the finished product to obtain an odor-removing and antiviral ecological board modified with Isatis indigotica active substances.

[0054] Comparative Example 1: The method of Example 3 was adopted to prepare Radix Isatidis active components and directly added them into the eco-board without modification by mesoporous nano-silica, maleic anhydride and polylysine.

[0055] Comparative Example 2: The method of Example 3 was adopted to prepare Radix Isatidis active components which were directly loaded on the mesoporous nano-silica material without modifying the mesoporous nano-silica.

[0056] Comparative Example 3: The method of Example 3 was adopted to prepare Radix Isatidis active components loaded on the mesoporous nano-silica material modified with maleic anhydride without using polylysine modification.

[0057] The present invention prepares an odor-removing and antiviral ecological board modified with Radix Isatidis active substances, and has good antibacterial, antiviral, odor-removing and anti-mildew properties in the application of the technical field of preparation of ecological boards. Specific tests are shown in the following table;

[0058] The ecological board was cut into a size of 50 mm × 50 mm and a thickness of 1 mm. Standard strains such as Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, influenza A virus H3N2, enterovirus 71 and Aspergillus niger were cultured in the culture medium. 6cfu / mL of bacterial or viral suspension was inoculated onto an ecological plate and cultured at 25°C and 85% relative humidity for 7 days. The number of surviving colonies was determined by the plate count method, and the inhibition rate = (the number of colonies in the control group - the number of colonies in the experimental group) / the number of colonies in the control group × 100%; the survival rate of the virus was determined by the cytopathic effect, and the inhibition rate = (the virus titer of the control group - the virus titer of the experimental group) / the virus titer of the control group × 100%; the mildew resistance level was divided into five levels from level 0 to level 4, and level 0 meant that there was no obvious mildew growth under a magnification of about 50 times; level 1 meant that mildew growth was invisible or difficult to see with the naked eye, but it was clearly visible under a magnifying glass; level 2 meant that mildew growth was clearly visible to the naked eye, and the coverage area on the sample surface was about 10%-30%; level 3 meant that mildew growth was clearly visible to the naked eye, and the coverage area on the sample surface was 30%-60%; level 4 meant that mildew growth was clearly visible to the naked eye, and the coverage area on the sample surface was greater than 60%.

[0059] According to the Chinese national standard "GB / T 27630-201X Automobile Interior Materials and Odor Evaluation Methods", automobile odor evaluation is divided into four levels: Level 1 (no obvious odor), Level 2 (slight odor), Level 3 (odor) and Level 4 (serious odor). This standard mainly evaluates odor through smell tests and odor scoring.

[0060] The obtained data are shown in Table 1

[0061] Table 1 Performance data of odor-removing and antiviral ecological boards modified with Radix Isatidis active substances in Examples 1-3 and Comparative Examples 1-3

[0062]

[0063]

[0064] By comparing Example 1-3 with Comparative Example 1-3, it can be seen that in the deodorizing and antiviral ecological board modified with Radix Isatidis active substances, the modified molecular nest structure material will have a significant impact on the performance of the ecological board.

[0065] According to Examples 1-3, as the content of the modified molecular nest structure material continues to increase, the antibacterial, antiviral, odor removal and mildew resistance of the ecological board continue to improve. This is because the modified molecular nest structure material provides better protection for the active ingredients, avoiding the degradation of the active ingredients due to environmental factors (such as temperature, humidity, etc.). In addition, the continuous increase in the content of the modified molecular nest structure material also means that more Isatis root active components are loaded onto the ecological board, and the active ingredients are the key to the antibacterial, antiviral and mildew resistance of the ecological board, thereby enhancing the antibacterial, antiviral and mildew resistance of the ecological board. At the same time, due to the addition of a porous structure to the ecological board, the adsorption capacity of the ecological board is also enhanced, which can more effectively remove odors. Therefore, under the joint action of these factors, the performance of the ecological board is significantly improved.

[0066] According to the above test experiments, Example 3 is used as the optimal example and compared with Comparative Examples 1-3 respectively.

[0067] By comparing Example 3 with Comparative Example 1, it can be seen that when the active components of Radix Isatidis are directly added to the ecological board without modification using mesoporous nano-silica, maleic anhydride and polylysine, the antibacterial, antiviral, odor removal and anti-mildew properties of the ecological board are significantly reduced. This is because directly adding the active components of Radix Isatidis to the ecological board will cause the active components to be degraded by factors such as heat and pressure during processing, and the stability is poor. Mesoporous nano-silica can provide a stable carrier, allowing the active components to be attached to the ecological board, and the mesoporous nano-silica material can control the active components. The release rate of the active ingredients can be reduced to avoid the rapid ineffectiveness of the active ingredients due to a large amount of one-time release. After the surface of mesoporous silica is modified by maleic anhydride, the adhesion of the active ingredients can be enhanced by forming chemical bonds or physical adsorption with the active ingredients. Polylysine can form a covering layer on the surface of the modified mesoporous silica, providing an additional physical barrier to protect the active ingredients from the external environment, thereby improving their stability. In the absence of mesoporous nano-silica, maleic anhydride and polylysine, the stability of the active ingredients is poor and they cannot play their role effectively. Therefore, the performance of the ecological board is significantly reduced.

[0068] By comparing Example 3 with Comparative Example 2, it can be seen that the antibacterial, antiviral, odor-removing and anti-mildew properties of the ecological board are significantly reduced when the active components of Radix Isatidis are directly loaded on the mesoporous nano-silica material without modifying the mesoporous nano-silica. This is because maleic anhydride can react with the hydroxyl groups on the surface of the mesoporous nano-silica material to form carboxyl groups, and then form more stable chemical bonds with the functional groups in the active ingredients, thereby improving the binding stability. Without maleic anhydride as a connecting bridge, the binding force between the active components of Radix Isatidis and the mesoporous nano-silica material is weak, and direct loading will cause the active ingredients to be easily lost during use and the active ingredients to be quickly inactivated, thereby significantly reducing the functionality of the ecological board.

[0069] By comparing Example 3 and Comparative Example 3, it can be seen that the active components of Radix Isatidis are loaded on the mesoporous nano-silica material modified with maleic anhydride without using polylysine modification. The antibacterial, antiviral, odor removal and anti-mildew properties of the ecological board are significantly reduced. This is because polylysine is positively charged and can form a covering layer with the negatively charged mesoporous nano-silica surface modified with maleic anhydride through electrostatic interaction, thereby enhancing the adhesion of the active ingredients. In addition, providing an additional physical barrier can protect the active ingredients from the influence of the external environment, thereby improving their stability. In addition, the covering layer of polylysine helps to control the release rate of the active ingredients, ensures that the active ingredients can be continuously released, and improves the long-term antibacterial and antiviral properties. In the absence of polylysine, the stability and release control of the active ingredients cannot be guaranteed, and thus the performance of the ecological board is significantly reduced.

[0070] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only preferred examples of the present invention, and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. The deodorizing and antiviral ecological board modified with Radix Isatidis active substances is characterized by: The invention comprises the following components in parts by weight: 1-5 parts by weight of a modified molecular nest structure material, 95-100 parts by weight of pine wood, 6-12 parts by weight of an isocyanate adhesive and 10-15 parts by weight of a melamine resin, and the rest is decorative paper; Among them, the modified molecular nest structure material is obtained by modifying the surface of mesoporous nano-silica material with maleic anhydride, impregnating the active components of Radix Isatidis, and then modifying the surface with polylysine.

2. The odor-removing and anti-viral ecological board modified with Radix Isatidis active substances according to claim 1, characterized in that: The specific preparation method of the modified molecular nest structure material is as follows: S1.

1. Select fresh or dried Radix Isatidis as raw material, remove impurities, clean and crush into coarse powder, use dryer to dry at 50-80°C, add ethanol solution with mass concentration of 55-65% to the crushed Radix Isatidis powder, heat and reflux at 50-60°C for extraction for 1-2h, filter the extract through filter paper, collect the filtrate, and then use rotary evaporator under 200-300mmHg reduced pressure to concentrate the filtrate to dryness, control the temperature at 35-40°C, finally place the extract in an oven, dry at 50-60°C to constant weight, and obtain the active component of Radix Isatidis; S1.2, dispersing the mesoporous nano-silica material in anhydrous ethanol solvent, stirring evenly with a magnetic stirrer, then adding maleic anhydride, setting the heating temperature to 70-80°C, and the reaction time to 1-2h. After the reaction is completed, separating the surface-modified mesoporous nano-silica by filtration, washing it with anhydrous ethanol solvent for 1-3 times, and drying it in an oven at 80-100°C for 12-24h to obtain mesoporous nano-silica surface-modified with maleic anhydride; S1.3, dissolving the active component of Radix Isatidis in anhydrous ethanol solvent, then adding mesoporous nano-silica surface-modified by maleic anhydride, heating in a water bath at 45-55°C for 2-4h for encapsulation, washing with anhydrous ethanol solvent, and drying at 60-80°C to obtain mesoporous nano-silica encapsulating the active component, i.e., a molecular nest structure material; S1.

4. Place the molecular nest structure material in a polylysine solution, stir continuously to form a uniformly dispersed suspension, react at room temperature for 1-2 hours, filter and dry to obtain a modified molecular nest structure material.

3. The odor-removing and anti-viral ecological board modified with Radix Isatidis active substances according to claim 2, characterized in that: The mass of the maleic anhydride is 2-6% of the mass of the mesoporous nano-silica.

4. The odor-removing and anti-viral ecological board modified with Radix Isatidis active substances according to claim 2, characterized in that: The mass ratio of the Radix Isatidis active components to the mesoporous nano-silicon dioxide is 1:6-10.

5. The odor-removing and anti-viral ecological board modified with Radix Isatidis active substances according to claim 2, characterized in that: The concentration of the polylysine solution is 1-5 mg / mL.

6. The odor-removing and anti-viral ecological board modified with Radix Isatidis active substances according to claim 2, characterized in that: The mass ratio of the polylysine solution to the mesoporous nano-silica is 1:8-10.

7. The odor-removing and anti-viral ecological board modified with Radix Isatidis active substances according to claim 1, characterized in that: The specific preparation method of the ecological board is as follows: S2.

1. Process pine wood to obtain shavings, dry them, and crush them into particles. Mix the modified molecular nest structure material with water to form a suspension, and evenly spray it on the pine wood particles. Then, evenly sprinkle the isocyanate adhesive on the wood particles, stir them evenly with a mixer, and then use a pre-pressing machine to preliminarily compress the mixed wood particles. The pre-pressing pressure is 1-2MPa, and the pre-pressing time is 30-60s. Put the pre-pressed wood particles into the mold of the hot press. The hot pressing temperature is 150-200℃, the hot pressing pressure is 3-7MPa, and the hot pressing time is 1-3min. After the hot pressing is completed, place the board on a cooling rack for natural cooling to obtain a modified plain board. S2.

2. Add the modified molecular nest structure material to the melamine resin, stir to make it evenly dispersed, immerse the melamine resin solution containing the modified molecular nest structure material, use a roller to squeeze out excess resin, place the impregnated decorative paper on a drying rack to dry naturally, and then place the dried decorative paper in an oven for thermal curing at a curing temperature of 150-200°C and a curing time of 20-30 minutes. Attach the cured decorative paper to the prepared modified plain board and use a hot press to perform hot pressing bonding at a hot pressing molding temperature of 100-200°C, a hot pressing pressure of 1-5MPa, and a hot pressing time of 5-10 minutes. After veneer is completed, the edges of the finished product are trimmed to obtain an odor-removing and antiviral ecological board modified with Isatis indigotica active substances.

8. The odor-removing and anti-viral ecological board modified with Radix Isatidis active substances according to claim 7, characterized in that: 1% to 5% of the modified molecular nest structure material is added to the modified molecular nest structure material suspension.

9. The deodorizing and antiviral ecological board modified with Radix Isatidis active substances according to claim 7, characterized in that: The particle diameter of the pine wood particles is 1-10 mm.

10. The odor-removing and anti-viral ecological board modified with Radix Isatidis active substances according to claim 7, characterized in that: The mass ratio of the isatis root powder to ethanol is 1:40-45.

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