A particle board with antibacterial functionality and a process for its production

Abstract

The present application relates to the field of plate, concretely relates to a kind of shavings board with antibacterial functional property and preparation process thereof.The shavings board is prepared by hot pressing from shavings and adhesive, wherein the adhesive is prepared from bisphenol A epoxy resin, phosphoric acid tris (2-chloropropyl) ester flame-retardant graft, tea saponin graft as main raw material, with curing agent, antioxidant and the like as auxiliary materials, by mixing preparation.The phosphoric acid tris (2-chloropropyl) ester flame-retardant graft and tea saponin graft component are added in the adhesive, wherein tea saponin graft and phosphoric acid tris (2-chloropropyl) ester flame-retardant graft substance play a role, so that the prepared shavings board has strong antibacterial property and flame retardancy, expands the application field of shavings board.

Description

Technical Field

[0001] This invention relates to the field of wood-based panels, and more specifically to a particleboard with antibacterial properties and its preparation process. Background Technology

[0002] Particleboard, as an important type of engineered wood product, has been widely used in furniture manufacturing, interior decoration, packaging materials, construction and other fields due to its advantages such as wide availability of raw materials, mature production technology, relatively low cost and stable mechanical properties.

[0003] However, with the upgrading of consumption and the improvement of health and safety awareness, the market demand for particleboard performance is shifting towards multi-functional integration. On the one hand, the strong sealing and suitable temperature and humidity of indoor environments provide breeding conditions for bacteria and mold. Microorganisms easily adhere to the surface and internal gaps of traditional particleboard, which not only leads to mold and blackening of the board and the generation of odors, but may also cause respiratory infections, skin allergies and other health problems through contact transmission. Tea saponin, as a natural glycoside compound extracted from tea tree parts, has broad-spectrum antibacterial activity. Its antibacterial effect is based on destroying the cell membrane of microorganisms. By embedding itself into the cell membrane with its amphiphilic structure to form pores, it destroys the integrity of the membrane, leading to leakage of cell contents and osmotic pressure imbalance. At the same time, it can inhibit the synthesis of microbial cell walls and block energy metabolism to achieve antibacterial effect. However, tea saponin is easily affected by environmental factors such as temperature, pH value, and light, which can weaken its antibacterial performance. On the other hand, particleboard is mainly composed of flammable organic materials such as cellulose and hemicellulose, with a low oxygen index. When exposed to fire, it is prone to violent combustion and releases toxic gases such as carbon monoxide and formaldehyde, which seriously endanger human health and safety. Traditional flame retardants are not effective and cannot cope with complex combustion scenarios.

[0004] Therefore, developing a particleboard that combines antibacterial and flame-retardant properties is of great practical significance. Summary of the Invention

[0005] The purpose of this invention is to provide a particleboard with antibacterial properties and its preparation process.

[0006] The objective of this invention can be achieved through the following technical solutions: A particleboard with antibacterial properties, the particleboard being composed of particleboard raw materials and an adhesive; the adhesive comprising the following raw materials measured in parts by weight: 50-60 parts bisphenol A epoxy resin, 10-15 parts tris(2-chloropropyl) phosphate flame retardant graft, 5-10 parts tea saponin graft, 2-5 parts diluent, 5-8 parts curing agent, 0.1-0.2 parts leveling agent, and 0.2-0.3 parts antioxidant.

[0007] Furthermore, the method for preparing the adhesive includes the following steps: Step A: Add bisphenol A epoxy resin, tris(2-chloropropyl) phosphate flame retardant graft, tea saponin graft, and diluent to a reaction vessel and stir for 30-40 minutes to obtain a premix. Step B: Add curing agent, leveling agent and antioxidant to the premix, stir for 2-4 hours to obtain adhesive.

[0008] Further, the diluent is resorcinol diglycidyl ether; the curing agent is m-phenylenediamine; the leveling agent is polydimethylsiloxane; and the antioxidant is butylated hydroxytoluene.

[0009] Furthermore, the preparation method of the tea saponin graft includes the following steps: Step SS1: Weigh 5-6g of cellulose and add it to 200-210ml of N,N-dimethylacetamide. Under nitrogen protection, heat to 100-110℃ and stir for 2-4h. Add 10-12g of lithium chloride and keep warm and stir for 4-6h. After the reaction is complete, control the temperature at 0-5℃ and add 3.5-4.5g of succinic anhydride and 0.2-0.3g of catalyst. Raise the temperature to 50-60℃ and stir for 4-6h. Remove the solvent and dry to obtain the cellulose intermediate. Step SS2: Weigh 4-5g of cellulose intermediate into a reaction vessel, add 180-200ml of N,N-dimethylacetamide and 8-9g of lithium chloride, stir well, then add 2.5-3.5g of tea saponin and 0.1-0.2g of p-toluenesulfonic acid, heat to 80-90℃, stir and react for 10-12h, remove the solvent under reduced pressure, and dry to obtain the tea saponin graft.

[0010] Furthermore, in step SS1, the catalyst is 4-dimethylaminopyridine.

[0011] The above-mentioned technical solution involves first dissolving cellulose in a system of N,N-dimethylacetamide and lithium chloride, then reacting the hydroxyl groups on the cellulose with succinic anhydride in the presence of a catalyst to produce a cellulose intermediate; finally, under the action of a catalyst, the carboxyl groups in the cellulose intermediate react with the hydroxyl groups in tea saponin to produce a tea saponin graft.

[0012] Furthermore, the preparation method of the tris(2-chloropropyl) phosphate flame-retardant grafted material includes the following steps: Step SSS1: Place 5-6g of 4-vinylphenol and 3-4g of acrylamide in a reaction vessel, add 100-110ml of benzene, stir evenly, heat to 60-70℃, add 0.5-0.6g of initiator, stir and react for 12-14h. After the reaction is complete, remove the solvent and dry to obtain the flame retardant intermediate. Step SSS2: Add 4.5-6g of flame retardant intermediate to 90-100ml of benzene, stir well, add 2-3g of tris(2-chloropropyl) phosphate and 0.1-0.2g of catalyst, heat and stir for 8-10h, remove the solvent after the reaction is complete, and dry to obtain tris(2-chloropropyl) phosphate flame retardant graft.

[0013] Further, in step SSS1, the initiator is azobisisobutyronitrile or benzoyl peroxide.

[0014] Furthermore, in step SSS2, the catalyst is triethylamine or diisopropylethylamine.

[0015] Furthermore, in step SSS2, the heating temperature is 50-60℃.

[0016] Through the above technical solution, the alkenyl groups in 4-vinylphenol and acrylamide undergo free radical polymerization under the action of an initiator to obtain a flame-retardant intermediate; under the action of a catalyst, the phenolic hydroxyl groups in the flame-retardant intermediate undergo a substitution reaction with the chlorine in tris(2-chloropropyl) phosphate to obtain a tris(2-chloropropyl) phosphate flame-retardant graft.

[0017] A method for preparing particleboard with antibacterial properties includes the following steps: Step S1: Put the wood raw material into a pulverizer and pulverize it into particles, process it into wood shavings with a length of 30-40mm, a width of 80-90mm and a thickness of 0.2-0.5mm, dry them, and obtain wood shaving raw material with a moisture content of 3-5%. Step S2: Place the wood shavings and adhesive in a mixing tank and mix and apply the adhesive. The amount of adhesive applied is 5-7% of the weight of the wood shavings to obtain the premixed particleboard material. Step S3: The particleboard premix is ​​laid out to form a board blank, which is then hot-pressed on a flat vulcanizing machine, cooled and shaped to obtain particleboard with antibacterial function. The beneficial effects of this invention are: (1) The antibacterial functional particleboard prepared by the present invention is made by mixing particleboard and adhesive and hot pressing. The adhesive is composed of bisphenol A epoxy resin, tea saponin graft, tri(2-chloropropyl) phosphate flame retardant graft, curing agent, etc. The tea saponin graft is made by grafting tea saponin onto cellulose, which can improve the stability of tea saponin and better exert its antibacterial effect. The nitrogen source and phosphorus source in the tri(2-chloropropyl) phosphate flame retardant graft synergistically retard flame, resulting in excellent flame retardant effect. Finally, the functional particleboard prepared by the present invention has antibacterial and flame retardant properties.

[0018] (2) In the adhesive prepared by the present invention, the polymer skeleton of cellulose fixes the small molecules of tea saponin, making the tea saponin less susceptible to aging by external light and oxygen, and giving full play to its antibacterial effect; the polar groups on cellulose form hydrogen bonds with the polar groups in the adhesive, making it more firmly connected in the adhesive system and less likely to fall off, and the prepared particleboard has antibacterial durability.

[0019] (3) The adhesive prepared in this invention contains acrylamide in tri(2-chloropropyl) phosphate flame retardant grafts. When burning, acrylamide releases inert gas that can dilute oxygen, absorb heat and cool down, and block the combustion chain, thereby achieving gas phase flame suppression and reducing the risk of secondary fire. Phosphoric acid forms a dense oxide layer at high temperature, which can effectively insulate heat and oxygen and protect the substrate from further combustion. The nitrogen system and phosphorus system form a synergistic flame retardant effect, further improving the flame retardant efficiency. Finally, it is mixed with wood chips and hot-pressed to obtain particleboard, which has excellent flame retardant properties.

[0020] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Detailed Implementation

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1: The method for preparing the adhesive includes the following steps: Step A: According to the weight proportions, add 50 parts of bisphenol A epoxy resin, 10 parts of tris(2-chloropropyl) phosphate flame retardant graft, 5 parts of tea saponin graft, and 2 parts of resorcinol diglycidyl ether diluent to the reaction vessel and stir for 30 minutes to obtain the premix. Step B: Add 5 parts by weight of curing agent m-phenylenediamine, 0.1 parts by weight of leveling agent polydimethylsiloxane, and 0.2 parts by weight of antioxidant dibutylhydroxytoluene to the premix, stir for 3 hours to obtain the adhesive.

[0023] The preparation method of the tea saponin graft includes the following steps: Step SS1: Weigh 5g of cellulose and add it to 200ml of N,N-dimethylacetamide. Under nitrogen protection, heat to 100℃ and stir for 2h. Add 10g of lithium chloride and keep warm and stir for 4h. After the reaction is complete, control the temperature at 2℃ and add 3.5g of succinic anhydride and 0.2g of 4-dimethylaminopyridine. After the addition is complete, raise the temperature to 50℃ and stir for 5h. Remove the solvent and dry to obtain the cellulose intermediate. Step SS2: Weigh 4g of cellulose intermediate into a reaction vessel, add 180ml of N,N-dimethylacetamide and 8g of lithium chloride, stir well, then add 2.5g of tea saponin and 0.1g of p-toluenesulfonic acid, heat to 90℃, stir and react for 12h, remove the solvent under reduced pressure, and dry to obtain the tea saponin graft.

[0024] The preparation method of the tris(2-chloropropyl) phosphate flame retardant graft includes the following steps: Step SSS1: Weigh 5g of 4-vinylphenol and 3g of acrylamide into a reaction vessel, add 100ml of benzene, stir evenly, heat to 70℃, add 0.5g of azobisisobutyronitrile, stir and react for 14h, after the reaction is completed, remove the solvent, and dry to obtain the flame retardant intermediate. Step SSS2: Weigh 4.5g of flame retardant intermediate, add it to 90ml of benzene, stir well, add 2g of tri(2-chloropropyl) phosphate and 0.1g of triethylamine, heat to 60℃, stir and react for 10h. After the reaction is completed, remove the solvent and dry to obtain the tri(2-chloropropyl) phosphate flame retardant graft.

[0025] Example 2, the method for preparing the adhesive includes the following steps: Step A: According to the weight proportions, add 52 parts of bisphenol A epoxy resin, 13 parts of tris(2-chloropropyl) phosphate flame retardant graft, 9 parts of tea saponin graft, and 4 parts of resorcinol diglycidyl ether diluent to the reaction vessel and stir for 30 minutes to obtain the premix. Step B: Add 6 parts by weight of curing agent m-phenylenediamine, 0.15 parts by weight of leveling agent polydimethylsiloxane, and 0.25 parts by weight of antioxidant dibutylhydroxytoluene to the premix, stir for 3 hours to obtain the adhesive.

[0026] The preparation methods of the tri(2-chloropropyl) phosphate flame retardant graft and the tea saponin graft are the same as those in Example 1.

[0027] Example 3: The method for preparing the adhesive includes the following steps: Step A: According to the weight proportions, add 60 parts of bisphenol A epoxy resin, 15 parts of tris(2-chloropropyl) phosphate flame retardant graft, 10 parts of tea saponin graft, and 5 parts of resorcinol diglycidyl ether diluent to the reaction vessel and stir for 30 minutes to obtain the premix. Step B: Add 8 parts by weight of curing agent m-phenylenediamine, 0.2 parts by weight of leveling agent polydimethylsiloxane, and 0.3 parts by weight of antioxidant dibutylhydroxytoluene to the premix, stir for 3 hours to obtain the adhesive.

[0028] The preparation methods of the tri(2-chloropropyl) phosphate flame retardant graft and the tea saponin graft are the same as those in Example 1.

[0029] Comparative Example 1: The method for preparing the adhesive includes the following steps: Step A: According to the weight proportions, add 52 parts of bisphenol A epoxy resin, 9 parts of tea saponin graft, and 4 parts of resorcinol diglycidyl ether diluent to the reaction vessel and stir for 30 minutes to obtain the premix. Step B: Add 6 parts by weight of curing agent m-phenylenediamine, 0.15 parts by weight of leveling agent polydimethylsiloxane, and 0.25 parts by weight of antioxidant dibutylhydroxytoluene to the premix, stir for 3 hours to obtain the adhesive.

[0030] The preparation method of the tea saponin graft is the same as that in Example 2.

[0031] Comparative Example 2, the method for preparing the adhesive includes the following steps: Step A: According to the weight proportions, add 52 parts of bisphenol A epoxy resin, 13 parts of tris(2-chloropropyl) phosphate flame retardant graft, and 4 parts of resorcinol diglycidyl ether diluent to the reaction vessel and stir for 30 minutes to obtain the premix. Step B: Add 6 parts by weight of curing agent m-phenylenediamine, 0.15 parts by weight of leveling agent polydimethylsiloxane, and 0.25 parts by weight of antioxidant dibutylhydroxytoluene to the premix, stir for 3 hours to obtain the adhesive.

[0032] The preparation method of the tri(2-chloropropyl) phosphate flame retardant graft is the same as that in Example 2.

[0033] Comparative Example 3: The method for preparing the adhesive includes the following steps: Step A: According to the weight proportions, add 52 parts of bisphenol A epoxy resin, 9 parts of tea saponin, and 4 parts of the diluent resorcinol diglycidyl ether to the reaction vessel and stir for 30 minutes to obtain the premix. Step B: Add 6 parts by weight of curing agent m-phenylenediamine, 0.15 parts by weight of leveling agent polydimethylsiloxane, and 0.25 parts by weight of antioxidant dibutylhydroxytoluene to the premix, stir for 3 hours to obtain the adhesive.

[0034] For the test example, the adhesives prepared in the comparative example and the embodiment were prepared into test samples, and the flame retardant performance was tested according to standard GB / T2406.2-2009; the anti-mildew and antibacterial properties were tested using Staphylococcus aureus as the strain according to standard QB / T 2591-2003. Based on the above experimental data, the adhesives prepared by adding tea saponin graft and tris(2-chloropropyl) phosphate flame retardant graft in Examples 1-3 all have an antibacterial rate of greater than 99%, an antifungal grade of 0, and an oxygen index of greater than 38%.

[0035] Comparing Comparative Examples 1, 3 and 2, the adhesive prepared without the addition of tri(2-chloropropyl) phosphate flame retardant graft material had a higher oxygen index than the adhesive prepared in Example 2. The nitrogen and phosphorus sources in the tri(2-chloropropyl) phosphate flame retardant graft material prepared in this invention synergistically retard the flame, resulting in excellent flame retardant properties of the adhesive.

[0036] Comparing Comparative Examples 2, 3, and 2, the adhesive prepared without the addition of tea saponin graft has a lower antibacterial rate and antifungal level than the adhesive prepared in Example 2. The adhesive prepared with the addition of tea saponin has lower antibacterial properties than the adhesive prepared in Comparative Example 2. Therefore, in this invention, tea saponin is not easily oxidized after being fixed by cellulose, and has better antibacterial properties, resulting in an adhesive with excellent antibacterial properties.

[0037] An antibacterial particleboard was prepared using the adhesives prepared in the embodiments and comparative examples of this invention, respectively. The specific preparation methods are as follows: Step S1: Put the wood raw material into a pulverizer to pulverize it into wood shavings with a length of 35mm, a width of 85mm and a thickness of 0.4mm. Dry the shavings to obtain wood shaving raw material with a moisture content of 4%. Step S2: Place the wood shavings and adhesive in a mixing tank and mix and apply the adhesive. The amount of adhesive applied is 7% of the weight of the wood shavings to obtain the wood shavings premix. Step S3: The particleboard premix is ​​laid out to form a board blank, which is then hot-pressed on a flat vulcanizing machine, cooled and shaped to obtain particleboard with antibacterial function. For the test example, the particleboard prepared in the examples and comparative examples was used to prepare test samples, and its physical and chemical properties were tested in accordance with the standard GB / T17657-2013.

[0038] Based on the above experimental data, the particleboard prepared in Examples 1-3 exhibits excellent static bending strength and internal bond strength. Comparing Comparative Example 1 with Example 2, the addition of a benzene ring structure in Example 2 further enhances its mechanical properties. Therefore, the adhesive prepared in this invention can improve the mechanical properties of particleboard.

[0039] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A particleboard with antibacterial function, characterized in that, The particleboard is composed of particleboard raw materials and adhesives; the adhesives include the following raw materials in parts by weight: 50-60 parts bisphenol A epoxy resin, 10-15 parts tris(2-chloropropyl) phosphate flame retardant graft, 5-10 parts tea saponin graft, 2-5 parts diluent, 5-8 parts curing agent, 0.1-0.2 parts leveling agent, and 0.2-0.3 parts antioxidant; The preparation method of the tea saponin graft includes the following steps: Step SS1: Add cellulose to N,N-dimethylacetamide, heat to 100-110℃ under nitrogen protection, stir for 1-2 hours, add lithium chloride, keep warm and stir for 2-4 hours, cool to room temperature, add succinic anhydride and catalyst at 0-5℃, after the addition is complete, raise the temperature to 50-60℃, stir and react for 4-6 hours, remove insoluble matter and solvent, and dry to obtain tea saponin intermediate; Step SS2: Place the antibacterial intermediate in a reaction vessel, add N,N-dimethylacetamide and lithium chloride, heat to 50-60℃, stir evenly, then add tea saponin and p-toluenesulfonic acid, heat to 80-90℃, stir and react for 10-12 hours, remove the solvent under reduced pressure, and dry to obtain the tea saponin graft. The preparation method of the tris(2-chloropropyl) phosphate flame retardant graft includes the following steps: Step SSS1: Place 4-vinylphenol and acrylamide in a reaction vessel, add benzene, stir evenly, heat to 60-70℃, add initiator, stir and react for 12-14 hours. After the reaction is completed, remove the solvent and dry to obtain the flame retardant intermediate. Step SSS2: Add the flame-retardant intermediate to benzene, stir until homogeneous, add tris(2-chloropropyl) phosphate and catalyst, heat and stir for 8-10 hours. After the reaction is complete, remove the solvent and dry to obtain the tris(2-chloropropyl) phosphate flame-retardant graft.

2. The particleboard with antibacterial function according to claim 1, characterized in that, The method for preparing the adhesive includes the following steps: Step A: Add bisphenol A epoxy resin, tris(2-chloropropyl) phosphate flame retardant graft, tea saponin graft, and diluent to a reaction vessel and stir for 30-40 minutes to obtain a premix. Step B: Add curing agent, leveling agent and antioxidant to the premix, stir for 2-4 hours to obtain adhesive.

3. The particleboard with antibacterial function according to claim 1, characterized in that, The diluent is resorcinol diglycidyl ether; the curing agent is m-phenylenediamine; the leveling agent is polydimethylsiloxane; and the antioxidant is butylated hydroxytoluene.

4. The particleboard with antibacterial function according to claim 1, characterized in that, In step SS1, the catalyst is 4-dimethylaminopyridine.

5. The particleboard with antibacterial function according to claim 1, characterized in that, In step SSS1, the initiator is azobisisobutyronitrile or benzoyl peroxide.

6. The particleboard with antibacterial function according to claim 1, characterized in that, In step SSS2, the catalyst is triethylamine or diisopropylethylamine.

7. The particleboard with antibacterial function according to claim 1, characterized in that, In step SSS2, the heating temperature is 50-60℃.

8. A method for preparing particleboard with antibacterial function as described in claim 1, characterized in that, Includes the following steps: Step S1: Put the wood raw material into a pulverizer and pulverize it into wood shavings with a length of 30-40mm, a width of 80-90mm, and a thickness of 0.2-0.5mm. Dry the shavings to obtain wood shaving raw material with a moisture content of 3-5%. Step S2: Place the wood shavings and adhesive in a mixing tank and mix and apply the adhesive. The amount of adhesive applied is 5-7% of the weight of the wood shavings to obtain the premixed particleboard material. Step S3: The particleboard premix is ​​laid out to form a board blank, which is then hot-pressed on a flat vulcanizing machine and cooled to set, resulting in particleboard with antibacterial properties.

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