Decorative plate facing paper capable of releasing negative oxygen ions and preparation method of decorative plate facing paper

Abstract

The invention discloses decorative plate facing paper capable of releasing negative oxygen ions and a preparation method of the decorative plate facing paper, and belongs to the technical field of facing paper. The decorative plate facing paper comprises the following raw materials in parts by weight: 50-80 parts of wood pulp, 5-10 parts of polyester fibers, 2-5 parts of natural tourmaline powder, 3-6 parts of a modified flame-retardant anti-aging agent, 5-8 parts of melamine glue, 4-6 parts of a dispersing agent and 5-7 parts of a wet strength agent. The preparation method comprises the following steps: carrying out benzene ring reaction on p-hydroxybenzonitrile under the catalysis of trifluoromethanesulfonic acid to generate an intermediate 1; reacting the intermediate 1 with 5-bromobenzothiazole-2-formaldehyde under the action of sodium hydroxide to generate an intermediate 2; reacting the intermediate 2 with lauryl amine to obtain an intermediate 3; then, 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is grafted to the intermediate 3, and the modified flame-retardant anti-aging agent is obtained. The decorative plate facing paper capable of releasing the negative oxygen ions, prepared by the invention, has excellent tensile property and flame retardant property.

Description

Technical Field

[0001] The invention relates to the technical field of facing paper, and in particular to a decorative board facing paper that releases negative oxygen ions and a preparation method thereof. Background Art

[0002] With the improvement of people's living standards and the enhancement of environmental awareness, people are paying more and more attention to indoor air quality. Negative oxygen ions have gradually become an important direction for the research and development of indoor decoration materials due to their air purification effect and benefits to human health. Negative oxygen ions can effectively purify suspended particles in the air, degrade harmful gases such as formaldehyde and benzene, and regulate the physiological functions of the human body. They are known as "air vitamins".

[0003] Among traditional interior decoration materials, decorative board facing paper is widely used in furniture, flooring and interior decoration. However, traditional decorative paper is relatively single in function and cannot meet people's needs for health and environmental protection. In recent years, with the rapid development of nanotechnology, materials science and other fields, the research on negative oxygen ion functional materials has made significant progress. In addition, the preparation process of negative oxygen ion decorative paper is also being optimized. By improving the impregnation process, coating technology and material formulation, not only can the release efficiency of negative oxygen ions be improved, but also the hydrophobicity, antibacterial and flame retardant properties of decorative paper can be enhanced. These improvements enable negative oxygen ion decorative paper to have a wider market application prospect while meeting environmental protection requirements.

[0004] However, most negative oxygen ion decorative papers on the market still have some shortcomings. For example, the release efficiency and durability of negative oxygen ions need to be improved, the uneven dispersion of functional fillers leads to a decrease in the mechanical strength of the decorative paper, and the performance stability of some products in humid environments is insufficient. Therefore, the development of an efficient, stable and environmentally friendly negative oxygen ion decorative board decorative paper and its preparation method is of great significance to promote the upgrading of interior decoration materials and meet people's needs for a healthy home environment.

[0005] A Chinese invention patent with publication number CN101624795A discloses gold and silver flake fantasy color veneer paper and a method for making the same. The gold and silver flake fantasy color veneer paper is made of the following raw materials in percentage by weight: 75.5%-94.5% wood pulp, 1%-4% gold and silver flakes, and 4.5%-20.5% additives. The invention solves the problem in the prior art that the gold and silver flakes cannot be retained evenly and firmly by adding special additives for papermaking, and applies the special decorative material of gold and silver flakes to decorative paper. The fantasy color veneer panel made using the product has an elegant, luxurious, and colorful decorative effect; however, its anti-aging and flame retardant properties are poor. Summary of the invention

[0006] In view of the deficiencies in the prior art, the object of the present invention is to provide a decorative board facing paper that releases negative oxygen ions and a preparation method thereof.

[0007] To achieve the above object, the present invention is implemented through the following technical solutions: A decorative board facing paper that releases negative oxygen ions, comprising the following raw materials in parts by weight: wood pulp: 50-80 parts, polyester fiber: 5-10 parts, natural tourmaline powder: 2-5 parts, modified flame retardant antioxidant: 3-6 parts, melamine glue: 5-8 parts, dispersant: 4-6 parts, wet strength agent: 5-7 parts; The modified flame retardant antioxidant is prepared by the following method: S1: Under nitrogen protection, p-hydroxybenzonitrile reacts with trifluoromethanesulfonic acid to generate intermediate 1; S2: Intermediate 1 reacts with 5-bromobenzothiazole-2-carboxaldehyde under the action of sodium hydroxide to generate intermediate 2; S3: Under nitrogen protection, anhydrous ethanol and dodecylamine were mixed, the temperature was raised to reflux, intermediate 2 was added in batches, and the reaction was carried out for 2-4 hours to obtain intermediate 3; S4: Under nitrogen protection, anhydrous ethanol, intermediate 3, and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide are mixed, and the mixture is reacted at 50-70° C. for 8-10 h to obtain a modified flame retardant and antioxidant.

[0008] In step S1, the mass ratio of p-hydroxybenzonitrile to trifluoromethanesulfonic acid is 20:(0.2-0.5).

[0009] In step S2, the feed mass ratio of the intermediate 1, 5-bromobenzothiazole-2-carboxaldehyde, and sodium hydroxide is 10:(20-25):(4-5).

[0010] In step S3, the mass ratio of anhydrous ethanol, dodecylamine and intermediate 2 is 50:(6-8):(10-15).

[0011] In step S4, the mass ratio of anhydrous ethanol, intermediate 3, and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 50:(10-12):(4-6).

[0012] The dispersant is prepared by the following method: S1: Under nitrogen protection, toluene, pentaerythritol and N,N-dihydroxyethylglycine are mixed, the temperature is raised to 120-140°C, p-toluenesulfonamide is added, and the reaction is carried out for 4-6 hours to obtain a hyperbranched polymer; S2: Add chloroacetic acid to the reactor, heat it up to melt, then add hyperbranched polymer and concentrated sulfuric acid, heat it up to 120-140°C, react for 8-10h, and post-treat to obtain a light yellow intermediate; S3: Add dichloromethane and light yellow intermediate into the reactor, stir to mix, slowly drop dodecyldimethylamine, reflux for 5-7h after dropwise addition, and obtain the dispersant by post-treatment.

[0013] In step S1, the mass ratio of toluene, pentaerythritol and N,N-dihydroxyethylglycine is 50:(3-5):(12-18); In step S2, the mass ratio of the chloroacetic acid, the hyperbranched polymer, and the concentrated sulfuric acid is 30:(8-10):(0.5-1); In step S3, the feed mass ratio of dichloromethane, light yellow intermediate, and dodecyldimethyl tertiary amine is 50:(8-12):(10-15).

[0014] The wet strength agent is polyethyleneimine resin.

[0015] A method for preparing a decorative board facing paper that releases negative oxygen ions comprises the following steps: (1) Weigh by weight: wood pulp: 50-80 parts, polyester fiber: 5-10 parts, natural tourmaline powder: 2-5 parts, modified flame retardant antioxidant: 3-6 parts, melamine glue: 5-8 parts, dispersant: 4-6 parts, wet strength agent: 5-7 parts; (2) Mix wood pulp and polyester fiber in proportion, add warm water at 40-60°C, and mechanically stir for 20-30 minutes to form a uniform slurry; ball-mill natural tourmaline powder, then add it together with a modified flame retardant and antioxidant to the slurry, and continue stirring for 1 hour; use a fourdrinier paper machine for wet forming, then add a wet strength agent, and dry with hot air for 8-10 hours to obtain base paper; (3) Mix melamine glue and dispersant in proportion, add deionized water to dilute, and stir at high speed for 30-40 minutes to form a uniform glue solution; adjust the pH to 8.5-9.0 to obtain an impregnating glue; (4) The base paper is impregnated with glue by a double-roll impregnation machine at a temperature of 50-60°C; then dried in stages, with the primary drying zone at 80°C drying for 20 minutes, the main drying zone at 120°C drying for 30 minutes, and the curing zone at 150°C drying for 10 minutes; then hot pressing is performed at 0.8-1.2MPa and 140-160°C for 5-8s to obtain decorative board facing paper that releases negative oxygen ions.

[0016] Due to the adoption of the above technical solution, the beneficial effects of the present invention include: (1) The present invention uses p-hydroxybenzonitrile to undergo a benzene cyclization reaction under the catalysis of trifluoromethanesulfonic acid to generate intermediate 1; intermediate 1 reacts with 5-bromobenzothiazole-2-carboxaldehyde under the action of sodium hydroxide to generate intermediate 2; then intermediate 2 reacts with dodecylamine to obtain intermediate 3; and then 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is grafted onto intermediate 3 to obtain a modified flame retardant antioxidant; (2) The present invention obtains a hyperbranched polymer by reacting pentaerythritol with N,N-dihydroxyethylglycine; then reacting with chloroacetic acid to obtain a light yellow intermediate; and then reacting with dodecyl dimethyl tertiary amine to obtain a hyperbranched dispersant; (3) The modified flame retardant and antioxidant prepared by the present invention integrates flame retardancy, antioxidant, weather resistance and other functions into a single molecule, reduces the types of additives, and avoids performance conflicts caused by multi-component compounding (such as the mutual cancellation of flame retardants and antioxidants); the stability of the phosphaphenanthrene structure can prolong the flame retardant effect, which matches the long-term release of negative oxygen ions by tourmaline, so that the decorative board facing paper can maintain environmental purification and fire safety during long-term use; (4) The dispersant prepared by the present invention has a hyperbranched structure, which can effectively improve the dispersibility of the negative oxygen ion releasing material, avoid agglomeration, and ensure the uniformity and stability of the negative oxygen ion release. Secondly, the dispersant enhances the interfacial compatibility between the base paper matrix and the negative oxygen ion releasing material, and improves the mechanical properties of the facing paper. In addition, the dodecyl dimethyl tertiary amine structure in the dispersant gives the facing paper a certain flexibility and antistatic properties, which can reduce dust adsorption and extend the service life. Finally, the introduction of the hyperbranched dispersant optimizes the process adaptability of the facing paper, reduces the amount of melamine glue used, and reduces the release of volatile organic compounds (VOCs), which meets environmental protection requirements. DETAILED DESCRIPTION

[0017] The invention will be further described below with reference to the embodiments, but the invention is not limited to these embodiments.

[0018] Example 1 Preparation of modified flame retardant antioxidant: S1: Under nitrogen protection, add 600g of chloroform and 200g of p-hydroxybenzonitrile to the reactor, stir and mix, then add 2g of trifluoromethanesulfonic acid, react at room temperature for 12h, then slowly add 30ml of saturated NH 4 Cl solution, and continued stirring for 20 min, extracted with ethyl acetate three times (200 ml of ethyl acetate was used each time), and distilled under reduced pressure at 60 ° C for 3 h. The intermediate 1 was separated and purified by silica gel column. The reaction equation is as follows:

[0019] S2: Under nitrogen protection, 800g DMSO, 100g intermediate 1, and 40g sodium hydroxide were added to the reactor in sequence, stirred and mixed, heated to 40°C, and 200g 5-bromobenzothiazole-2-carboxaldehyde (40g per batch, 5min interval between batches) were added in batches. The reaction was continued for 10h, cooled to room temperature, centrifuged, washed 3 times with dichloromethane (400g dichloromethane each time), washed once with 400g deionized water, and distilled at 50°C under reduced pressure for 3h to obtain intermediate 2. The reaction equation is as follows:

[0020] S3: Under nitrogen protection, add 500g of anhydrous ethanol and 60g of dodecylamine to the reactor, stir and mix, heat to reflux, add 100g of intermediate 2 in four batches (25g in each batch, 5min interval between batches), react for 2h, then place in an ice water bath, cool for 1h, precipitate crystals, filter, and vacuum dry at 60℃ for 4h to obtain intermediate 3; the reaction equation is as follows:

[0021] S4: Under nitrogen protection, add 500g of anhydrous ethanol, 100g of intermediate 3, and 40g of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide into the reactor, stir and mix, heat to 50°C, react for 10h, cool naturally to room temperature, then cool to 0°C and stir for 2h, filter, wash with 150ml of anhydrous ethanol, and vacuum dry at 80°C for 3h to obtain a modified flame retardant antioxidant, the structural formula of which is as follows:

[0022] Its nuclear magnetic resonance hydrogen spectrum data are as follows: 1H NMR (500 MHz, Chloroform-d) δ 8.25 – 8.17 (m, 12H), 7.95 – 7.88(m, 3H), 7.85 (dd, J = 8.2, 0.5 Hz, 3H), 7.74 (td, J = 7.3, 1.3 Hz, 3H), 7.60(td, J = 7.3, 1.4 Hz, 3H), 7.53 – 7.45 (m, 3H), 7.48 – 7.40 (m, 6H), 7.32(dd, J = 2.1, 0.5 Hz, 3H), 7.17 – 7.11 (m, 6H), 7.03 (dd, J = 8.2, 2.2 Hz,3H), 5.47 (d, J = 7.8 Hz, 3H), 4.71 (dt, J = 7.8, 5.4 Hz, 3H), 2.88 (dq, J =13.4, 5.2 Hz, 3H), 2.75 (dq, J = 13.4, 5.2 Hz, 3H), 1.56 – 1.42 (m, 6H), 1.38– 1.22 (m, 54H), 0.94 – 0.85 (m, 9H). Example 2 Preparation of modified flame retardant antioxidant: S1: Under nitrogen protection, add 600g of chloroform and 200g of p-hydroxybenzonitrile to the reactor, stir and mix, then add 3g of trifluoromethanesulfonic acid, react at room temperature for 13h, then slowly add 40ml of saturated NH 4 Cl solution, and continued stirring for 20 min, extracted with ethyl acetate three times (200 ml of ethyl acetate was used each time), distilled under reduced pressure at 70 °C for 2 h, and separated and purified by silica gel column to obtain intermediate 1; S2: Under nitrogen protection, 800 g DMSO, 100 g intermediate 1 and 45 g sodium hydroxide were added to the reactor in sequence, stirred and mixed, heated to 50°C, and 225 g 5-bromobenzothiazole-2-carboxaldehyde (45 g per batch, 5 min interval between batches) were added in batches. The mixture was reacted for 9 h, cooled to room temperature, centrifuged and filtered, washed with dichloromethane 3 times (400 g dichloromethane each time), washed once with 400 g deionized water, and distilled at 60°C under reduced pressure for 3 h to obtain intermediate 2; S3: Under nitrogen protection, add 500 g of anhydrous ethanol and 70 g of dodecylamine to the reactor, stir and mix, heat to reflux, add 120 g of intermediate 2 in 4 batches (30 g in each batch, 5 min interval between batches), react for 3 h, then place in an ice-water bath, cool for 1 h, precipitate crystals, filter, and vacuum dry at 60 °C for 4 h to obtain intermediate 3; S4: Under nitrogen protection, add 500 g of anhydrous ethanol, 110 g of intermediate 3, and 50 g of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide into the reactor, stir and mix, heat to 60°C, react for 9 hours, cool naturally to room temperature, then cool to 0°C and stir for 2 hours, filter, wash with 150 ml of anhydrous ethanol, and vacuum dry at 70°C for 3 hours to obtain a modified flame retardant and antioxidant.

[0023] Example 3 Preparation of modified flame retardant antioxidant: S1: Under nitrogen protection, add 600g of chloroform and 200g of p-hydroxybenzonitrile to the reactor, stir and mix, then add 5g of trifluoromethanesulfonic acid, react at room temperature for 14h, then slowly add 60ml of saturated NH 4 Cl solution, and continued stirring for 20 min, extracted with ethyl acetate three times (200 ml of ethyl acetate was used each time), distilled under reduced pressure at 70 °C for 2 h, and separated and purified by silica gel column to obtain intermediate 1; S2: Under nitrogen protection, 800 g DMSO, 100 g intermediate 1, and 6 g sodium hydroxide were added to the reactor in sequence, stirred and mixed, heated to 60°C, and 250 g 5-bromobenzothiazole-2-carboxaldehyde (50 g per batch, with a batch interval of 5 min) was added in batches, reacted for 8 h, cooled to room temperature, centrifuged, washed with dichloromethane 3 times (400 g of dichloromethane each time), washed once with 400 g of deionized water, and distilled at 65°C under reduced pressure for 3.5 h to obtain intermediate 2; S3: Under nitrogen protection, add 500 g of anhydrous ethanol and 80 g of dodecylamine to the reactor, stir and mix, heat to reflux, add 150 g of intermediate 2 in 5 batches (30 g in each batch, 5 min interval between batches), react for 4 h, then place in an ice-water bath, cool for 1 h, precipitate crystals, filter, and vacuum dry at 70 °C for 3 h to obtain intermediate 3; S4: Under nitrogen protection, add 500 g of anhydrous ethanol, 120 g of intermediate 3, and 60 g of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide into the reactor, stir and mix, heat to 70°C, react for 8 hours, cool naturally to room temperature, then cool to 0°C and stir for 2 hours, filter, wash with 150 ml of anhydrous ethanol, and dry in vacuo at 60°C for 4 hours to obtain a modified flame retardant and antioxidant.

[0024] Example 4 Preparation of dispersant: S1: Under nitrogen protection, 500 g toluene, 30 g pentaerythritol, and 120 g N,N-dihydroxyethylglycine were added to the reactor, stirred and mixed, and the temperature was raised to 120°C. Then, 8 g p-toluenesulfonamide was added, and the reaction was continued for 6 h (a water separator was used to remove the generated water during the reaction), and then the mixture was distilled under reduced pressure at 60°C for 3 h, and vacuum dried at 70°C for 2 h to obtain a hyperbranched polymer; the reaction equation is shown as follows:

[0025] S2: Add 300g of chloroacetic acid to the reactor, heat it up (80°C) to melt, add 80g of hyperbranched polymer and 5g of concentrated sulfuric acid (98.3wt%), then heat it up to 120°C, react for 10h, wash the reaction solution with 400ml of deionized water, separate the liquid, dissolve it with 500ml of dichloromethane, and dissolve 40g of anhydrous Na 2 SO 4 Dry, filter, distill at 45°C under reduced pressure for 4h, and dry in vacuo at 70°C for 3h to obtain a light yellow intermediate, the structural formula of which is shown below:

[0026] S3: Add 500g of dichloromethane and 80g of light yellow intermediate to the reactor, stir and mix, slowly drop 100g of dodecyldimethylamine, drop for 10min, reflux for 5h after the drop is complete, distill under reduced pressure at 55℃ for 3h, then recrystallize with acetone / ethanol mixed solution (acetone / ethanol = 9:1 (V / V)), repeat 3 times (each time using 300ml of the mixed solution), vacuum dry at 60℃ for 5h to obtain a dispersant, the structural formula of which is as follows:

[0027] Example 5 Preparation of dispersant: S1: Under nitrogen protection, 500 g toluene, 40 g pentaerythritol, and 150 g N,N-dihydroxyethylglycine were added to the reactor, stirred and mixed, and the temperature was raised to 130°C. Then, 10 g p-toluenesulfonamide was added, and the reaction was continued for 5 h (a water separator was used to remove the generated water during the reaction), and then the mixture was distilled under reduced pressure at 70°C for 2 h, and vacuum dried at 60°C for 4 h to obtain a hyperbranched polymer; S2: Add 300g of chloroacetic acid to the reactor, heat it up (80°C) to melt, add 90g of hyperbranched polymer and 8g of concentrated sulfuric acid (98.3wt%), then heat it up to 130°C, react for 9h, wash the reaction solution with 400ml of deionized water, separate the liquid, dissolve it with 500ml of dichloromethane, and dissolve 40g of anhydrous Na 2 SO 4 Dry, filter, distill at 45°C under reduced pressure for 4 h, and dry in vacuo at 60°C for 3 h to obtain a light yellow intermediate; S3: Add 500g of dichloromethane and 100g of light yellow intermediate into the reactor, stir to mix, slowly add 120g of dodecyldimethylamine dropwise for 10min, reflux for 6h, distill at 50℃ for 3h, recrystallize with acetone / ethanol mixed solution (acetone / ethanol = 9:1 (V / V)), repeat 3 times (using 300ml of mixed solution each time), and dry under vacuum at 70℃ for 4h to obtain a dispersant.

[0028] Example 6 Preparation of dispersant: S1: Under nitrogen protection, 500 g toluene, 50 g pentaerythritol, and 180 g N,N-dihydroxyethylglycine were added to the reactor, stirred and mixed, and the temperature was raised to 140°C. Then, 12 g p-toluenesulfonamide was added, and the reaction was continued for 4 h (a water separator was used to remove the generated water during the reaction), and then the mixture was distilled under reduced pressure at 70°C for 2 h, and vacuum dried at 60°C for 4 h to obtain a hyperbranched polymer; S2: Add 300g of chloroacetic acid to the reactor, heat it up (80°C) to melt, add 100g of hyperbranched polymer and 10g of concentrated sulfuric acid (98.3wt%), then heat it up to 140°C, react for 8h, wash the reaction solution with 400ml of deionized water, separate the liquid, dissolve it with 500ml of dichloromethane, and dissolve 40g of anhydrous Na 2 SO 4 Dry, filter, distill at 50°C under reduced pressure for 3 h, and dry in vacuo at 60°C for 4 h to obtain a light yellow intermediate; S3: Add 500g of dichloromethane and 120g of light yellow intermediate into the reactor, stir to mix, slowly add 150g of dodecyldimethylamine dropwise, add for 10min, reflux for 7h, distill at 60℃ for 2h, recrystallize with acetone / ethanol mixed solution (acetone / ethanol = 9:1 (V / V)), repeat 3 times (using 300ml of mixed solution each time), and vacuum dry at 80℃ for 3h to obtain the dispersant.

[0029] Example 7 Preparation of decorative board facing paper releasing negative oxygen ions: (1) Weigh: 500 g of wood pulp, 50 g of polyester fiber, 20 g of natural tourmaline powder, 30 g of modified flame retardant and antioxidant (prepared in Example 1), 50 g of melamine glue, 40 g of dispersant (prepared in Example 4), and 50 g of wet strength agent (polyethyleneimine resin); (2) Mix wood pulp and polyester fiber in proportion, add 4000ml of 40℃ warm water, and stir mechanically for 20min to form a uniform slurry; ball-mill natural tourmaline powder to a particle size of ≤5μm, then add it together with the modified flame retardant and antioxidant into the slurry and continue stirring for 1h; use a fourdrinier papermaking machine for wet forming, with a basis weight of 80g / m 2 , the dehydration speed of the wire section is 15m / min, then a wet strength agent is added, and hot air drying is performed at 65℃ for 8h to obtain base paper; (3) Mix melamine glue and dispersant in proportion, add 500 ml of deionized water to dilute, stir at high speed for 30 minutes at a speed of 6000 r / min to form a uniform glue solution; adjust the pH to 8.5 to obtain an impregnating glue; (4) The base paper is impregnated with glue by a double-roll impregnation machine at a temperature of 50°C; then, it is dried in stages, with the primary drying zone at 80°C for 20 minutes, the main drying zone at 120°C for 30 minutes, and the curing zone at 150°C for 10 minutes; then, it is hot-pressed at 0.8 MPa and 140°C for 8 seconds to obtain the decorative board facing paper that releases negative oxygen ions.

[0030] Example 8 Preparation of decorative board facing paper releasing negative oxygen ions: (1) Weigh: 600 g of wood pulp, 80 g of polyester fiber, 30 g of natural tourmaline powder, 40 g of modified flame retardant and antioxidant (prepared in Example 2), 60 g of melamine glue, 50 g of dispersant (prepared in Example 5), and 60 g of wet strength agent (polyethyleneimine resin); (2) Mix wood pulp and polyester fiber, add 4000ml 50℃ warm water, and stir mechanically for 25min to form a uniform slurry; ball mill natural tourmaline powder with a particle size of ≤5μm, then add it to the slurry together with the modified flame retardant and antioxidant, and continue stirring for 1h; use a fourdrinier papermaking machine for wet forming, with a basis weight of 100g / m 2 , the dehydration speed of the wire section is 20m / min, then a wet strength agent is added, and hot air drying is performed at 60℃ for 9h to obtain base paper; (3) Mix melamine glue and dispersant, add 500 ml of deionized water to dilute, stir at high speed for 35 minutes at a speed of 6000 r / min to form a uniform glue solution; adjust the pH to 9.0 to obtain impregnation glue; (4) The base paper is impregnated with glue by a double-roll impregnation machine at a temperature of 55°C; then, it is dried in stages, with the primary drying zone at 80°C for 20 minutes, the main drying zone at 120°C for 30 minutes, and the curing zone at 150°C for 10 minutes; then, it is hot-pressed at 1.0 MPa and 150°C for 6 seconds to obtain the decorative board facing paper that releases negative oxygen ions.

[0031] Example 9 Preparation of decorative board facing paper releasing negative oxygen ions: (1) Weigh: 800 g of wood pulp, 100 g of polyester fiber, 50 g of natural tourmaline powder, 60 g of modified flame retardant and antioxidant (prepared in Example 3), 80 g of melamine glue, 60 g of dispersant (prepared in Example 6), and 70 g of wet strength agent (polyethyleneimine resin); (2) Mix wood pulp and polyester fiber, add 4000ml of 60℃ warm water, and stir mechanically for 30min to form a uniform slurry; ball-mill natural tourmaline powder to a particle size of ≤5μm, then add it to the slurry together with the modified flame retardant and antioxidant, and continue stirring for 1h; use a fourdrinier papermaking machine for wet forming, with a basis weight of 120g / m 2, the dehydration speed of the wire part is 20m / min, then a wet strength agent is added, and hot air drying is carried out at 60℃ for 10h to obtain base paper; (3) Mix melamine glue and dispersant in proportion, add 500 ml of deionized water to dilute, stir at high speed for 40 minutes at a speed of 6000 r / min to form a uniform glue solution; adjust the pH to 9.0 to obtain an impregnating glue; (4) The base paper is impregnated with glue by a double-roll impregnation machine at a temperature of 60°C; then, it is dried in stages, with the primary drying zone at 80°C for 20 minutes, the main drying zone at 120°C for 30 minutes, and the curing zone at 150°C for 10 minutes; then, it is hot-pressed at 1.2 MPa and 160°C for 5 seconds to obtain the decorative board facing paper that releases negative oxygen ions.

[0032] In the examples and comparative examples of the present application, 0.5 M hydrochloric acid and 0.5 M sodium hydroxide solution were used to adjust the pH of the impregnated glue.

[0033] Comparative Example 1 A decorative board facing paper that releases negative oxygen ions, the raw material composition and process are basically the same as those of Example 8, the difference being that no modified flame retardant and antioxidant is added to the components.

[0034] Comparative Example 2 A decorative board facing paper that releases negative oxygen ions, the raw material composition and process are basically the same as those of Example 8, the difference being that the modified flame retardant and antioxidant added in the components is replaced by an equal weight of the intermediate 3 prepared in Example 2.

[0035] Comparative Example 3 A decorative board facing paper that releases negative oxygen ions, the raw material composition and process are basically the same as those of Example 8, the difference being that the modified flame retardant and antioxidant is replaced by an equal weight of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide.

[0036] Comparative Example 4 A decorative board facing paper that releases negative oxygen ions, the raw material composition and process are basically the same as those of Example 8, the difference being that the modified flame retardant and antioxidant is replaced by a modified flame retardant and antioxidant prepared by the following method: S1: Under nitrogen protection, 800 g DMSO, 100 g 2-(2,4-dihydroxyphenyl)-4,6-bis(2,4-xylyl)-1,3,5-triazine and 45 g sodium hydroxide were added to the reactor in sequence, stirred and mixed, heated to 50°C, and 225 g 5-bromobenzothiazole-2-carboxaldehyde (45 g per batch, 5 min interval between batches) were added in batches, reacted for 9 h, cooled to room temperature, centrifuged and filtered, washed with dichloromethane 3 times (400 g dichloromethane each time), washed once with 400 g deionized water, and distilled at 60°C under reduced pressure for 3 h to obtain intermediate 4; S2: Under nitrogen protection, add 500 g of anhydrous ethanol and 70 g of dodecylamine to the reactor, stir and mix, heat to reflux, add 120 g of intermediate 2 in 4 batches (30 g in each batch, 5 min interval between batches), react for 3 h, then place in an ice-water bath, cool for 1 h, precipitate crystals, filter, and vacuum dry at 60 °C for 4 h to obtain intermediate 5; S3: Under nitrogen protection, add 500g of anhydrous ethanol, 110g of intermediate 5, and 50g of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide into the reactor, stir and mix, heat to 60°C, react for 9h, cool naturally to room temperature, then cool to 0°C and stir for 2h, filter, wash with 150ml of anhydrous ethanol, and dry in vacuo at 70°C for 3h to obtain a modified flame retardant and antioxidant.

[0037] Comparative Example 5 A decorative board facing paper that releases negative oxygen ions, the raw material composition and process are basically the same as those of Example 8, the difference being that the modified flame retardant and antioxidant is replaced by a modified flame retardant and antioxidant prepared by the following method: S1: Under nitrogen protection, add 600g of chloroform and 200g of p-hydroxybenzonitrile to the reactor, stir and mix, then add 3g of trifluoromethanesulfonic acid, react at room temperature for 13h, then slowly add 40ml of saturated NH 4 Cl solution, and continued stirring for 20 min, extracted with ethyl acetate three times (200 ml of ethyl acetate was used each time), distilled under reduced pressure at 70 °C for 2 h, and separated and purified by silica gel column to obtain intermediate 1; S2: Under nitrogen protection, 800 g DMSO, 100 g intermediate 1 and 45 g sodium hydroxide were added to the reactor in sequence, stirred and mixed, heated to 50°C, and 225 g 5-bromobenzothiazole-2-carboxaldehyde (45 g per batch, 5 min interval between batches) were added in batches. The mixture was reacted for 9 h, cooled to room temperature, centrifuged and filtered, washed with dichloromethane 3 times (400 g dichloromethane each time), washed once with 400 g deionized water, and distilled at 60°C under reduced pressure for 3 h to obtain intermediate 2; S3: Under nitrogen protection, add 500 g of anhydrous ethanol and 70 g of p-aminobenzonitrile to the reactor, stir and mix, heat to reflux, add 120 g of intermediate 2 in 4 batches (30 g in each batch, 5 min interval between batches), react for 3 h, then place in an ice-water bath, cool for 1 h, precipitate crystals, filter, and vacuum dry at 60 °C for 4 h to obtain intermediate 6; S4: Under nitrogen protection, add 500 g of anhydrous ethanol, 110 g of intermediate 6, and 50 g of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide into the reactor, stir and mix, heat to 60°C, react for 9 hours, cool naturally to room temperature, then cool to 0°C and stir for 2 hours, filter, wash with 150 ml of anhydrous ethanol, and dry in vacuo at 70°C for 3 hours to obtain a modified flame retardant and antioxidant.

[0038] Comparative Example 6 A decorative board facing paper that releases negative oxygen ions, the raw material composition and process are basically the same as those of Example 8, the difference being that the modified flame retardant and antioxidant is replaced by a modified flame retardant and antioxidant prepared by the following method: S1: Under nitrogen protection, add 600g of chloroform and 200g of p-hydroxybenzonitrile to the reactor, stir and mix, then add 3g of trifluoromethanesulfonic acid, react at room temperature for 13h, then slowly add 40ml of saturated NH 4 Cl solution, and continued stirring for 20 min, extracted with ethyl acetate three times (200 ml of ethyl acetate was used each time), distilled under reduced pressure at 70 °C for 2 h, and separated and purified by silica gel column to obtain intermediate 1; S2: Under nitrogen protection, 800 g DMSO, 100 g intermediate 1 and 45 g sodium hydroxide were added to the reactor in sequence, stirred and mixed, heated to 50°C, and 225 g 2-thiophenecarboxaldehyde (45 g per batch, 5 min interval between batches) were added in batches, reacted for 9 h, cooled to room temperature, centrifuged and filtered, washed with dichloromethane 3 times (400 g dichloromethane each time), washed once with 400 g deionized water, and distilled at 60°C under reduced pressure for 3 h to obtain intermediate 7; S3: Under nitrogen protection, add 500 g of anhydrous ethanol and 70 g of dodecylamine to the reactor, stir and mix, heat to reflux, add 120 g of intermediate 7 in 4 batches (30 g in each batch, 5 min interval between batches), react for 3 h, then place in an ice-water bath, cool for 1 h, precipitate crystals, filter, and vacuum dry at 60 °C for 4 h to obtain intermediate 8; S4: Under nitrogen protection, add 500 g of anhydrous ethanol, 110 g of intermediate 8, and 50 g of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide into the reactor, stir and mix, heat to 60°C, react for 9 hours, cool naturally to room temperature, then cool to 0°C and stir for 2 hours, filter, wash with 150 ml of anhydrous ethanol, and vacuum dry at 70°C for 3 hours to obtain a modified flame retardant and antioxidant.

[0039] Comparative Example 7 A decorative board facing paper that releases negative oxygen ions, the raw material composition and process are basically the same as those of Example 8, the difference being that the modified flame retardant and antioxidant is replaced by a modified flame retardant and antioxidant prepared by the following method: S1: Under nitrogen protection, 500 g toluene, 100 g silicone resin, and 100 g 4-((4-(hydroxymethyl)phenyl)(phenyl)amino)benzaldehyde were added to the reactor in sequence, and ultrasonically mixed for 10 min. Then 2 ml glacial acetic acid was added dropwise, and the temperature was raised to reflux for reaction for 7 h. After cooling to room temperature, 1.5 kg anhydrous ethanol was added for precipitation, filtered, and vacuum dried at 60 ° C for 10 h to obtain intermediate 9; S2: Under nitrogen protection, 1 kg DMF and 150 g intermediate 9 were added into the reactor, stirred and mixed, and the temperature was raised to 80° C. Then, 100 g 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide was added, and the reaction was continued for 10 h, and the mixture was rotary evaporated at 60° C. for 3 h, and vacuum dried at 80° C. for 4 h to obtain intermediate 10; S3: 1 kg of toluene and 60 g of cyanuric chloride were added to the reactor, stirred in an ice bath, and then 120 g of N-butyl-2,2,6,6-tetramethyl-4-piperidinamine was slowly added and reacted for 2 h; 10 ml of 40 wt% sodium hydroxide solution was then added dropwise for 2 min, and the temperature was raised to 70 °C and the reaction was continued for 16 h. After the reaction was completed, deionized water and ethyl acetate were added for extraction 3 times (1000 mL of deionized water and 400 mL of ethyl acetate were used each time), and then dried with 300 g of anhydrous sodium sulfate for 2 h, rotary evaporated at 50 °C for 3 h, and vacuum dried at 70 °C for 5 h to obtain intermediate 11; S4: Add 500g DMSO, 50g intermediate 11 and 5g potassium hydroxide into the reactor, stir and mix, replace the air with nitrogen, pressurize to 0.5MPa, heat to 150℃ and then increase the pressure to 1.0MPa, then slowly add 100g intermediate 10, react for 20h, distill at 60℃ under reduced pressure for 5h, and vacuum dry at 80℃ for 4h to obtain the modified flame retardant and antioxidant.

[0040] The organosilicon resin in this comparative example was prepared by the following method: Add 43.26g of phenyltriethoxysilane to the reactor, then add 20mL of 15wt% hydrochloric acid solution as a catalyst, slowly add 4.12g of N-(β-aminoethyl-)-γ-aminopropylmethyl-dimethoxysilane, add for 30s, stir to mix, reflux for 4h, add 11.34g of hexamethyldisiloxane to cap, react for another 1h, then slowly add 25%wt ammonia water to adjust the pH to 8-9, produce a precipitate, filter, wash with deionized water 3 times (50g of deionized water each time), and dry in vacuo at 80°C for 5h to obtain a silicone resin.

[0041] Comparative Example 8 A decorative board facing paper that releases negative oxygen ions, the raw material composition and process are basically the same as those of Example 8, the difference being that the dispersant is replaced by a dispersant prepared by the following method: S1: Under nitrogen protection, 500 g toluene, 40 g 2-methyl-1,2,4-butanetriol, and 150 g N,N-dihydroxyethylglycine were added to the reactor, stirred and mixed, and the temperature was raised to 130°C. Then, 10 g p-toluenesulfonamide was added, and the reaction was continued for 5 h (a water separator was used to remove the generated water during the reaction), and then the mixture was distilled under reduced pressure at 70°C for 2 h, and vacuum dried at 60°C for 4 h to obtain a hyperbranched polymer; S2: Add 300g of chloroacetic acid to the reactor, heat it up (80°C) to melt, add 90g of hyperbranched polymer and 8g of concentrated sulfuric acid (98.3wt%), then heat it up to 130°C, react for 9h, wash the reaction solution with 400ml of deionized water, separate the liquid, dissolve it with 500ml of dichloromethane, and dissolve 40g of anhydrous Na 2 SO 4 Dry, filter, distill at 45°C under reduced pressure for 4 h, and dry in vacuo at 60°C for 3 h to obtain a light yellow intermediate; S3: Add 500g of dichloromethane and 100g of light yellow intermediate into the reactor, stir to mix, slowly add 120g of dodecyldimethylamine dropwise for 10min, reflux for 6h, distill at 50℃ for 3h, recrystallize with acetone / ethanol mixed solution (acetone / ethanol = 9:1 (V / V)), repeat 3 times (using 300ml of mixed solution each time), and dry under vacuum at 70℃ for 4h to obtain a dispersant.

[0042] Comparative Example 9 A decorative board facing paper that releases negative oxygen ions, the raw material composition and process are basically the same as those of Example 8, the difference being that the dispersant is replaced by a dispersant prepared by the following method: S1: Under nitrogen protection, 500 g toluene, 40 g pentaerythritol, and 150 g N,N-dihydroxyethylglycine were added to the reactor, stirred and mixed, and the temperature was raised to 130°C. Then, 10 g p-toluenesulfonamide was added, and the reaction was continued for 5 h (a water separator was used to remove the generated water during the reaction), and then the mixture was distilled under reduced pressure at 70°C for 2 h, and vacuum dried at 60°C for 4 h to obtain a hyperbranched polymer; S2: Add 300g of chloroacetic acid to the reactor, heat it up (80°C) to melt, add 90g of hyperbranched polymer and 8g of concentrated sulfuric acid (98.3wt%), then heat it up to 130°C, react for 9h, wash the reaction solution with 400ml of deionized water, separate the liquid, dissolve it with 500ml of dichloromethane, and dissolve 40g of anhydrous Na 2 SO 4 Dry, filter, distill at 45°C under reduced pressure for 4 h, and dry in vacuo at 60°C for 3 h to obtain a light yellow intermediate; S3: Add 500g of dichloromethane and 100g of light yellow intermediate into the reactor, stir to mix, slowly add 120g of octadecyldimethylamine dropwise, add for 10min, reflux for 6h, distill at 50℃ under reduced pressure for 3h, recrystallize with acetone / ethanol mixed solution (acetone / ethanol = 9:1 (V / V)), repeat 3 times (using 300ml of mixed solution each time), and dry under vacuum at 70℃ for 4h to obtain a dispersant.

[0043] Comparative Example 10 A decorative board facing paper that releases negative oxygen ions, the raw material composition and process are basically the same as those of Example 8, the difference being that the dispersant is replaced by a dispersant prepared by the following method: S1: Add 300g of chloroacetic acid to the reactor, heat it up (80℃) to melt, add 80g of propylene glycol and 10g of concentrated sulfuric acid (98.3wt%), then heat it up to 140℃, react for 8h, wash the reaction solution with 400ml of deionized water, separate the liquid, dissolve it with 500ml of dichloromethane, and dissolve 40g of anhydrous Na 2 SO 4 Dry, filter, distill at 50°C under reduced pressure for 3 h, and dry in vacuo at 60°C for 4 h to obtain a light yellow intermediate; S2: Add 500g of dichloromethane and 120g of light yellow intermediate into the reactor, stir to mix, slowly add 150g of dodecyldimethylamine dropwise for 10min, reflux for 5h, distill at 60℃ for 2h, recrystallize with acetone / ethanol mixed solution (acetone / ethanol = 9:1 (V / V)), repeat 3 times (using 300ml of mixed solution each time), and dry under vacuum at 80℃ for 3h to obtain the dispersant.

[0044] Comparative Example 11 Gold and silver flake iridescent veneer paper is prepared using the raw material composition, proportion and method of Example 2 of the Chinese invention patent with publication number CN101624795A.

[0045] The wood pulp model used in the examples and comparative examples of the present application is NBSK (fiber length 2.5-3.5 mm), purchased from Shandong Chenming Paper Group Co., Ltd.; the polyester fiber model is POY (75D / 72F), purchased from Tongkun Group Co., Ltd.; the natural tourmaline powder particle size is 2000 mesh, purchased from Shijiazhuang Tourmaline Mineral Products Co., Ltd.; the melamine glue model is E0 grade, with a solid content of 57.3wt%, purchased from Fengze Glue Factory, Lanshan District, Linyi City; the polyethyleneimine resin model is G-35.

[0046] The decorative board facing papers releasing negative oxygen ions prepared in Examples 7-9 and Comparative Examples 1-11 were subjected to ultraviolet aging tests, and the test method was carried out according to the method of GB / T 16422.3-2014 "Plastic Laboratory Light Source Exposure Test Method".

[0047] The decorative board facing papers releasing negative oxygen ions prepared in Examples 7-9 and Comparative Examples 1-11 were subjected to a negative oxygen ion concentration test, and the test method was carried out in accordance with the method of JC / T1016-2020 "Test Method for Indoor Air Ion Concentration"; the test results are shown in Table 1.

[0048] The negative oxygen ion releasing decorative board facing papers prepared in Examples 7-9 and Comparative Examples 1-11 and the aged facing papers were subjected to tensile strength tests according to the method of GB / T 12914-2008 Determination of tensile strength of paper and paperboard; the test results are shown in Table 1.

[0049] The decorative board facing papers releasing negative oxygen ions prepared in Examples 7-9 and Comparative Examples 1-11 and the aged facing papers were subjected to a vertical combustion (UL-94) test. According to the ASTM D3801 standard, the vertical combustion grade of the samples was evaluated using a CZF-3 instrument. The sample size was 130×13×3.2 mm. 3 The test results are shown in Table 1.

[0050] It can be seen from Examples 7, 8 and 9 in Table 1 that the tensile strength of the decorative board facing paper releasing negative oxygen ions prepared by the present invention is greater than 8 kN / m, the tensile strength after aging is greater than 6.75 kN / m, and the flame retardant grade after aging remains at V-0 level, showing excellent tensile and flame retardant properties.

[0051] Comparative Example 1 is a comparative example without adding modified flame retardant and antioxidant. It can be seen from the data in Table 1 that its tensile strength after aging is 3.52 kN / m, the combustion grade (UL-94) is V-2, and the anti-aging performance and flame retardant performance are both poor.

[0052] Comparative Example 2 is different from Example 8, and the difference is that the modified flame retardant and antioxidant is replaced by an intermediate 3 of equal weight. It can be seen from the data in Table 1 that the tensile strength after aging is 4.68 kN / m, and the combustion grade (UL-94) is V-2. No substances containing flame retardant functional groups are added, and the flame retardant effect is poor.

[0053] Comparative Example 3 is different from Example 8, and the difference is that the modified flame retardant and antioxidant is replaced by an equal weight of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide. It can be seen from the data in Table 1 that the tensile strength after aging is 3.66 kN / m, and the combustion grade (UL-94) is V-2. No substances containing functional groups with anti-aging effects are added, and the anti-aging performance is poor.

[0054] Comparative Example 4 is different from Example 8, and the difference is that the intermediate 2 in step S2 of the preparation process of the modified flame retardant and antioxidant is replaced by 2-(2,4-dihydroxyphenyl)-4,6-bis(2,4-xylyl)-1,3,5-triazine. It can be seen from the data in Table 1 that the tensile strength after aging is 5.21 kN / m and the flammability grade (UL-94) is V-1. This is because the aromatic ring structure generated by the benzene cyclization reaction catalyzed by trifluoromethanesulfonic acid can enhance the interfacial bonding force between the flame retardant and the natural tourmaline in the facing paper through π-π interaction, avoid the phase separation problem between the flame retardant and the negative oxygen ion releasing material, thereby improving the performance of the facing paper.

[0055] Comparative Example 5 is different from Example 8, and the difference is that the dodecylamine in step S3 of the preparation process of the modified flame retardant and antioxidant is replaced by an equal weight of p-aminobenzonitrile. It can be seen from the data in Table 1 that the tensile strength after aging is 5.36 kN / m, and the combustion grade (UL-94) is V-0; the introduction of dodecylamine can improve the hydrophobicity of the flame retardant, inhibit the oxidative degradation of wood pulp or fiber substrate, extend the service life of the facing paper, and avoid the degradation of physical properties due to aging.

[0056] Comparative Example 6 is different from Example 8, and the difference lies in that the 5-bromobenzothiazole-2-carboxaldehyde in step S2 of the modified flame retardant and antioxidant preparation process is replaced by an equal weight of 2-thiophenecarboxaldehyde. It can be seen from the data in Table 1 that the tensile strength after aging is 5.43 kN / m, and the flammability rating (UL-94) is V-0; the rigid structure of the benzothiazole ring can enhance the mechanical strength of the facing paper, and the long alkyl chain of dodecylamine can improve flexibility and enhance the durability of the facing paper.

[0057] Comparative Example 7 is different from Example 8 in that the preparation method of the modified flame retardant antioxidant is different. It can be seen from the data in Table 1 that its tensile strength after aging is 5.14 kN / m, and its anti-aging performance is average.

[0058] Comparative Example 8 is different from Example 8, and the difference is that pentaerythritol in step S1 of the preparation process of the dispersant is replaced with an equal weight of 2-methyl-1,2,4-butanetriol. It can be seen from the data in Table 1 that the tensile strength after aging is 6.32 kN / m, and the flammability rating (UL-94) is V-0.

[0059] Comparative Example 9 is different from Example 8, and the difference is that the dodecyl dimethyl tertiary amine in step S3 of the preparation process of the dispersant is replaced with an equal weight of octadecyl dimethyl tertiary amine. It can be seen from the data in Table 1 that the tensile strength after aging is 6.63 kN / m, and the flammability rating (UL-94) is V-0.

[0060] Comparative Example 10 is different from Example 8, and the difference is that the light yellow intermediate prepared in step S2 of the preparation process of the dispersant is replaced by an equal weight of propylene glycol. It can be seen from the data in Table 1 that the tensile strength after aging is 6.19 kN / m, and the flammability rating (UL-94) is V-0.

[0061] The anti-aging effect and flame retardant effect of Comparative Examples 8-10 are not as good as the facing paper prepared in the present application, and the specific reasons are as follows: The dispersant prepared in the present application has a multi-branched structure, which can be coated on the surface of the negative oxygen ion releasing material by physical adsorption or chemical bonding to prevent it from agglomerating; the steric hindrance effect of the dispersant can significantly improve the uniform distribution of the negative oxygen ion releasing material in the facing paper matrix, thereby improving the stability and efficiency of the negative oxygen ion release. The introduction of hyperbranched dispersants can improve the interfacial compatibility between the base paper matrix and the negative oxygen ion releasing material, reduce interfacial defects, and thus improve the tensile strength, wear resistance and tear resistance of the facing paper; at the same time, the dodecyl dimethyl tertiary amine structure in the dispersant gives the facing paper a certain flexibility, avoiding cracking problems during processing or use caused by increased brittleness. The dispersant prepared using 2-methyl-1,2,4-butanetriol and propylene glycol has less hyperbranched structure, which will reduce the steric hindrance effect of the dispersant, resulting in poor dispersibility of the negative oxygen ion releasing material in the facing paper matrix, thereby reducing the performance of the facing paper in all aspects.

[0062] Comparative Example 11 is a facing paper prepared using the raw materials and proportions in Example 2 of the Chinese invention patent with publication number CN101624795A, and its anti-aging performance and flame retardant performance are not as good as those of the present application.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. However, any equivalent changes, modifications and evolutions made by ordinary technicians in the field without departing from the scope of the technical solution of the present invention by using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A decorative board facing paper that releases negative oxygen ions, characterized in that: The invention comprises the following raw materials in parts by weight: wood pulp: 50-80 parts, polyester fiber: 5-10 parts, natural tourmaline powder: 2-5 parts, modified flame retardant antioxidant: 3-6 parts, melamine glue: 5-8 parts, dispersant: 4-6 parts, wet strength agent: 5-7 parts; The modified flame retardant antioxidant is prepared by the following method: S1: Under nitrogen protection, p-hydroxybenzonitrile reacts with trifluoromethanesulfonic acid to generate intermediate 1; S2: Intermediate 1 reacts with 5-bromobenzothiazole-2-carboxaldehyde under the action of sodium hydroxide to generate intermediate 2; S3: Under nitrogen protection, anhydrous ethanol and dodecylamine were mixed, the temperature was raised to reflux, intermediate 2 was added in batches, and the reaction was carried out for 2-4 hours to obtain intermediate 3; S4: Under nitrogen protection, anhydrous ethanol, intermediate 3, and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide are mixed, and the mixture is reacted at 50-70° C. for 8-10 h to obtain a modified flame retardant and antioxidant.

2. The decorative board facing paper for releasing negative oxygen ions according to claim 1, characterized in that: In step S1, the mass ratio of p-hydroxybenzonitrile to trifluoromethanesulfonic acid is 20:(0.2-0.5).

3. The decorative board facing paper for releasing negative oxygen ions according to claim 1, characterized in that: In step S2, the feed mass ratio of the intermediate 1, 5-bromobenzothiazole-2-carboxaldehyde, and sodium hydroxide is 10:(20-25):(4-5).

4. The decorative board facing paper for releasing negative oxygen ions according to claim 1, characterized in that: In step S3, the mass ratio of anhydrous ethanol, dodecylamine and intermediate 2 is 50:(6-8):(10-15).

5. The decorative board facing paper for releasing negative oxygen ions according to claim 1, characterized in that: In step S4, the mass ratio of anhydrous ethanol, intermediate 3, and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide is 50:(10-12):(4-6).

6. The decorative board facing paper for releasing negative oxygen ions according to claim 1, characterized in that: The dispersant is prepared by the following method: S1: Under nitrogen protection, toluene, pentaerythritol and N,N-dihydroxyethylglycine are mixed, the temperature is raised to 120-140°C, p-toluenesulfonamide is added, and the reaction is carried out for 4-6 hours to obtain a hyperbranched polymer; S2: Add chloroacetic acid to the reactor, heat it up to melt, then add hyperbranched polymer and concentrated sulfuric acid, heat it up to 120-140°C, react for 8-10h, and post-treat to obtain a light yellow intermediate; S3: Add dichloromethane and light yellow intermediate into the reactor, stir to mix, slowly drop dodecyldimethylamine, reflux for 5-7h after dropwise addition, and obtain the dispersant by post-treatment.

7. The decorative board facing paper for releasing negative oxygen ions according to claim 6, characterized in that: In step S1, the mass ratio of toluene, pentaerythritol and N,N-dihydroxyethylglycine is 50:(3-5):(12-18).

8. The decorative board facing paper for releasing negative oxygen ions according to claim 6, characterized in that: In step S2, the mass ratio of the chloroacetic acid, the hyperbranched polymer, and the concentrated sulfuric acid is 30:(8-10):(0.5-1); In step S3, the feed mass ratio of dichloromethane, light yellow intermediate, and dodecyldimethyl tertiary amine is 50:(8-12):(10-15).

9. The decorative board facing paper for releasing negative oxygen ions according to claim 1, characterized in that: The wet strength agent is polyethyleneimine resin.

10. A method for preparing the decorative board facing paper that releases negative oxygen ions according to any one of claims 1 to 9, characterized in that: The following steps are involved: (1) Weigh by weight: wood pulp: 50-80 parts, polyester fiber: 5-10 parts, natural tourmaline powder: 2-5 parts, modified flame retardant antioxidant: 3-6 parts, melamine glue: 5-8 parts, dispersant: 4-6 parts, wet strength agent: 5-7 parts; (2) Mix wood pulp and polyester fiber in proportion, add warm water at 40-60°C, and mechanically stir for 20-30 minutes to form a uniform slurry; ball-mill natural tourmaline powder, then add it together with a modified flame retardant and antioxidant to the slurry, and continue stirring for 1 hour; use a fourdrinier paper machine for wet forming, then add a wet strength agent, and dry with hot air for 8-10 hours to obtain base paper; (3) Mix melamine glue and dispersant in proportion, add deionized water to dilute, and stir at high speed for 30-40 minutes to form a uniform glue solution; adjust the pH to 8.5-9.0 to obtain an impregnating glue; (4) The base paper is impregnated with glue by a double-roll impregnation machine at a temperature of 50-60°C; then dried in stages, with the primary drying zone at 80°C drying for 20 minutes, the main drying zone at 120°C drying for 30 minutes, and the curing zone at 150°C drying for 10 minutes; then hot pressing is performed at 0.8-1.2MPa and 140-160°C for 5-8s to obtain decorative board facing paper that releases negative oxygen ions.

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