A kind of renewable forming board of artificial board and preparation method thereof

Abstract

The invention discloses a renewable formed board material of an artificial board and a preparation method thereof, and relates to the technical field of decoration materials. The board material is obtained by assembling colored paper impregnated with melamine formaldehyde resin and a base plate of a blank, or the board material is obtained by assembling colored paper impregnated with melamine formaldehyde resin, a base plate of a blank and colored paper impregnated with melamine formaldehyde resin; the base plate of the blank is obtained by paving veneer on the surface of a polished recycled artificial board; the colored paper impregnated with melamine formaldehyde resin is obtained by impregnating the colored paper in a modified melamine formaldehyde resin; the modified melamine formaldehyde resin is obtained by adding organic silicon dioxide during the preparation of the melamine formaldehyde resin. The present invention utilizes a recycled board material of a defective product as a base material for processing, thereby effectively reducing the processing cost; the modified melamine formaldehyde resin prepared by the present invention has good toughness and low water absorption, and the colored paper impregnated with the resin is used as the surface layer of the board material, thereby giving the material good hydrophobicity and mechanical properties.

Description

Technical Field

[0001] The invention relates to the technical field of decoration materials, and in particular to a renewable molded board of an artificial board and a preparation method thereof. Background Art

[0002] The existing decorative panel technology is generally assembled through multi-layer materials (multi-base + one or two-sided), and the surface layer is added with steel templates for surface treatment, resulting in diversified patterns and textures to meet the diverse needs of the market. The existing assembly methods and processes are single, and the process pressing time is required to be long, which leads to the need for more corresponding steel templates and increases the processing cost. Secondly, there are always defective products in industrial production. Therefore, a method is developed to add defective products and other artificial board materials, use a rapid pressing process to synthesize new panels, and reduce development costs to meet the increasingly diverse market needs for patterns and colors.

[0003] Among them, the color paper of the surface material of the decorative board is impregnated with melamine formaldehyde resin, which is a water-soluble resin formed by methylation reaction and condensation reaction of melamine powder and formaldehyde under slightly alkaline conditions. The curing of melamine formaldehyde resin is achieved through cross-linking of methylene or dimethylene ether bonds. Because the two ends of the methylene are connected to triazine rings with great steric hindrance, and multiple methylenes are intertwined with triazine rings, the cured resin is hard, not easy to bend, and has almost no toughness. Summary of the invention

[0004] The purpose of the present invention is to provide a renewable molded board of artificial board and a preparation method thereof, so as to solve the following technical problems:

[0005] The existing embryo assembly methods and processes are all single, and the process pressing time is required to be long, which results in the need for more corresponding steel templates and increases the processing cost.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] The board is obtained by assembling colored paper impregnated with melamine formaldehyde resin and a base plate, or the board is obtained by assembling colored paper impregnated with melamine formaldehyde resin, a base plate and colored paper impregnated with melamine formaldehyde resin;

[0008] The embryo board substrate comprises a substrate and veneer, wherein the substrate is obtained by grinding recycled artificial boards, and the veneer is paved on the upper surface or the lower surface, or the upper surface and the lower surface, of the substrate.

[0009] Preferably, the melamine formaldehyde resin impregnated colored paper is obtained by impregnating the colored paper in modified melamine formaldehyde resin.

[0010] Preferably, the preparation method of the modified melamine formaldehyde resin comprises the following steps:

[0011] S1: Add 3,5-dihydroxybenzoic acid, potassium carbonate and N,N-dimethylformamide to a reaction bottle, control the temperature to 70-80°C, keep warm for 10-30 minutes under stirring, add 1,3-bis(chloromethyl)-1,1,3,3-tetrakis(trimethylsilyloxy)disiloxane, keep warm for 48-72 hours, rotary evaporate and post-treat to obtain component 1;

[0012] S2: Add epoxidized silica and dimethyl sulfoxide to a reaction kettle and swell for 6-12 hours, add deionized water, adjust the pH to 10-11, add component 1, control the temperature to 70-80°C, keep the temperature for reaction for 6-12 hours, wash with water, and dry to obtain organic silica;

[0013] S3: Add the formaldehyde solution into the reaction kettle, control the temperature at 35-45°C, add melamine, keep warm and stir for 10-30 minutes, adjust the pH to 8-9, control the temperature at 90-95°C, keep warm and react for 10-30 minutes, add organic silicon dioxide, keep warm and react for 1-3 hours, add water, cool and discharge, and obtain modified melamine formaldehyde resin.

[0014] Preferably, the addition ratio of 3,5-dihydroxybenzoic acid, potassium carbonate, N,N-dimethylformamide and 1,3-bis(chloromethyl)-1,1,3,3-tetrakis(trimethylsilyloxy)disiloxane in S1 is 0.5-1 g: 1-1.5 g: 10-50 mL: 1 g.

[0015] Preferably, the specific steps of the post-treatment are: adding tetrahydrofuran to dissolve, adding a hydrochloric acid aqueous solution with a pH of 3 to precipitate, repeating the above dissolution and precipitation three times, and taking the precipitate, which is component one.

[0016] Preferably, the addition ratio of epoxidized silicon dioxide, 20 mL of dimethyl sulfoxide, 20 mL of deionized water, and component one in S2 is 1 g: 10-20 mL: 10-20 mL: 2-4 g.

[0017] Preferably, the formaldehyde solution in S3 is a 37 wt % formaldehyde aqueous solution; the modified silicon dioxide accounts for 5-10% of the total mass of formaldehyde and melamine; and the molar ratio of formaldehyde:melamine is 1.6-2.05:1.

[0018] Preferably, the preparation method of epoxidized silicon dioxide comprises the following steps: adding anhydrous ethanol, deionized water and γ-glycidyloxypropyltrimethoxysilane into a reaction kettle and ultrasonically dispersing them for 0.5-1h, adding nano-silicon dioxide, adjusting the pH to 3-4, controlling the temperature to 60-80°C, keeping the reaction warm for 3-6h, centrifuging, washing with ethanol and drying to obtain epoxidized silicon dioxide.

[0019] Preferably, the addition ratio of anhydrous ethanol, deionized water, γ-glycidyloxypropyltrimethoxysilane and nano-silicon dioxide is 90-180 mL: 10-20 mL: 2-5 g: 10 g.

[0020] A method for preparing a renewable formed board of an artificial board comprises the following steps:

[0021] A1: Select a recycled artificial board with a smooth surface, and use a sander to remove the melamine formaldehyde resin impregnated colored paper that has been pressed on the surface of the recycled artificial board to obtain the base material;

[0022] A2: paving veneer on the upper surface or the lower surface of the substrate or paving veneer on the upper surface and the lower surface of the substrate, with an adhesive layer provided between the substrate and the veneer, to obtain a substrate composite board; pressing the substrate composite board to obtain a green board substrate;

[0023] A3: A composite board is obtained by assembling colored paper impregnated with melamine formaldehyde resin and a base material of a raw board, or a composite board is obtained by assembling colored paper impregnated with melamine formaldehyde resin, a base material of a raw board and colored paper impregnated with melamine formaldehyde resin; the composite board is subjected to hot pressing to obtain a renewable molded board of an artificial board.

[0024] Preferably, in step A2, the pressing temperature is 135-140° C., the pressure is 60-75 MPa, and the pressing time is 5-20 min;

[0025] In step A3, the hot pressing temperature is 135-140° C., the pressure is 30-40 MPa, and the pressing time is 45-90 s.

[0026] Preferably, the adhesive layer is obtained by coating the adhesive on the surface of the substrate, and the coating amount of the adhesive is 10-60g / m 2 ; The adhesive is any one of melamine formaldehyde resin, white latex, all-purpose glue, PUR glue, polyurethane resin adhesive, acrylic resin adhesive, and epoxy resin adhesive.

[0027] Preferably, the upper surface and the lower surface of the substrate composite board before pressing are provided with PET anti-sticking isolation films, and the PET anti-sticking isolation films are peeled off after the substrate composite board is pressed.

[0028] Preferably, before hot pressing the composite plate, a steel template and a thick heat-conducting silicone plate are sequentially arranged on the upper surface and the lower surface of the composite plate.

[0029] Preferably, the veneer is recycled veneer, technological veneer, artificial veneer, native veneer or the like.

[0030] Preferably, the substrate can be selected from defective products such as those with glue penetration, pollution, white spots, etc. that do not affect the surface flatness of the product. The melamine formaldehyde resin impregnated colored paper layer that has been pressed on the surface can be sanded away with a sanding machine until a white colored paper layer remains on the surface to increase the bonding performance.

[0031] Beneficial effects of the present invention:

[0032] (1) Existing decorative panel technology generally assembles multiple layers of materials (multiple bases + one or two sides), and then adds steel templates to the surface layer for surface treatment, resulting in diversified patterns and textures to meet the diverse needs of customers. The existing assembly methods and processes are single, and the process pressing time is relatively long, which results in the need for more corresponding steel templates. Applying for the use of defective products, defective products of GB7911 decorative laminates as the base material, can recycle unqualified synthetic panels and save production costs. The veneer is directly bonded to the base material with an adhesive, and the melamine formaldehyde resin impregnated color paper is placed on the outermost layer to meet people's increasingly diverse needs for patterns and colors.

[0033] (2) The present application uses 3,5-dihydroxybenzoic acid and 1,3-bis(chloromethyl)-1,1,3,3-tetra(trimethylsiloxy)disiloxane as raw materials to synthesize component one, wherein component one is a hyperbranched polysiloxane having a large number of terminal phenolic hydroxyl groups; the present application then uses γ-glycidyloxypropyltrimethoxysilane to generate silanol after hydrolysis, and reacts with the hydroxyl groups on the surface of nano-silica particles to graft epoxy groups on the surface of silica through chemical bonds to obtain epoxidized silica; the present application uses part of the epoxy groups on the surface of epoxidized silica to react with the phenolic hydroxyl groups of component one under low temperature to obtain organic silica; the present application adds organic silica during the preparation of melamine formaldehyde resin, which can not only utilize the organic silica to participate in the reaction, but also effectively adjust the problem of low toughness of the resin due to excessive crosslinking density during the curing process of melamine formaldehyde resin; and the component grafted on the surface of the organic silica contains -S iOS i-, phenolic hydroxyl and epoxy groups, etc., effectively alleviate the curing reaction time of melamine formaldehyde resin, and give the material flexibility, bonding strength, water resistance and pollution resistance.

[0034] (3) In the present application, the epoxy silica is chemically bonded to component one, and the hydroxyl group of the organic silica is used to chemically modify the melamine formaldehyde resin. The organic silica has the characteristics of being stable and not decomposing, and the organic silica reduces the condensation between the hydroxymethyl and the amino group in the melamine formaldehyde resin system, thereby effectively improving the storage stability of the melamine formaldehyde resin. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below in conjunction with the accompanying drawings.

[0036] Figure 1 It is a schematic diagram of the cross-sectional structure of an embodiment of a renewable molded board of artificial board prepared in the present application.

[0037] Figure 2 It is a schematic diagram of the cross-sectional structure of another embodiment of a renewable molded board of artificial board prepared in the present application.

[0038] In the figure: 1. Base material; 2. Veneer; 3. Color paper impregnated with melamine formaldehyde resin. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in 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.

[0040] A renewable molded board of artificial board is obtained by assembling colored paper 3 impregnated with melamine formaldehyde resin and a base material of a embryonic board, or by assembling colored paper 3 impregnated with melamine formaldehyde resin, a base material of a embryonic board and colored paper 3 impregnated with melamine formaldehyde resin.

[0041] The embryo board substrate comprises a substrate 1 and a veneer 2. The substrate 1 is obtained by grinding recycled artificial boards, and the veneer 2 is laid on the upper surface or the lower surface of the substrate 1, or on both the upper surface and the lower surface.

[0042] An adhesive layer is provided between the substrate 1 and the veneer 2 .

[0043] The adhesive layer is obtained by coating the adhesive on the surface of the substrate 1, and the coating amount of the adhesive is 10-60g / m 2 .

[0044] The adhesive is any one of melamine formaldehyde resin, white latex, all-purpose glue, PUR glue, polyurethane resin adhesive, acrylic resin adhesive, and epoxy resin adhesive.

[0045] The veneer can be any type of veneer including recycled veneer, technical veneer, artificial veneer, etc.

[0046] The substrate 1 is obtained by grinding recycled artificial boards, and the recycled artificial boards refer to defective GB7911 decorative laminates.

[0047] The melamine formaldehyde resin impregnated colored paper layer that has been pressed on the surface is sanded at least once with a sanding machine until a white colored paper layer remains on the surface to increase the bonding performance, thereby obtaining a substrate 1. The melamine formaldehyde resin impregnated colored paper layer on the surface of the substrate 1 is only lightly sanded until a white colored paper layer remains on the surface, in order to remove the color of the original colored paper but retain the melamine formaldehyde resin impregnated colored paper layer, only to increase the bonding area and form a blocking layer for the melamine formaldehyde resin impregnated colored paper layer, which can effectively prevent the uncured part of the phenolic adhesive of the original substrate from penetrating the surface of the substrate 1, thereby affecting the final color of the board.

[0048] Embodiment 1 The preparation method of modified melamine formaldehyde resin comprises the following steps:

[0049] S1: 90 mL of anhydrous ethanol, 10 mL of deionized water, and 2 g of γ-glycidyloxypropyltrimethoxysilane were added to a reaction kettle and ultrasonically dispersed for 0.5 h, 10 g of nano-silicon dioxide was added, the pH was adjusted to 3, the temperature was controlled at 60°C, the reaction was kept warm for 3 h, centrifuged, washed with ethanol, and dried to obtain epoxidized silicon dioxide;

[0050] S2: 15 g of 3,5-dihydroxybenzoic acid, 30 g of potassium carbonate, and 300 mL of N,N-dimethylformamide were added to a reaction bottle, the temperature was controlled at 70°C, and the mixture was kept warm for 10 min under stirring. 30 g of 1,3-bis(chloromethyl)-1,1,3,3-tetrakis(trimethylsilyloxy)disiloxane was added, and the mixture was kept warm for 48 h. The mixture was evaporated, tetrahydrofuran was added to dissolve the mixture, and a pH 3 hydrochloric acid aqueous solution was added to precipitate the mixture. The above dissolution and precipitation were repeated three times, and the precipitate was taken to obtain component 1;

[0051] S3: 10 g of epoxidized silica and 100 mL of dimethyl sulfoxide were added to a reaction kettle to swell for 6-12 h, 100 mL of deionized water was added, 30 wt% sodium hydroxide solution was added to adjust the pH to 10, 20 g of component 1 was added, the temperature was controlled at 70 ° C, the reaction was kept warm for 6 h, washed with water, and dried to obtain organic silica;

[0052] S4: Add 100g of 37wt% formaldehyde solution into a reactor, control the temperature at 35°C, add 20g of melamine, keep warm and stir for 10min, add 30wt% sodium hydroxide solution to adjust the pH to 8, control the temperature at 90°C, keep warm and react for 10min, add 5.7g of organic silica, keep warm and react for 1h, add water to adjust the solid content to 55%, cool and discharge, and obtain modified melamine formaldehyde resin.

[0053] Embodiment 2 The preparation method of modified melamine formaldehyde resin comprises the following steps:

[0054] S1: 140 mL of anhydrous ethanol, 14 mL of deionized water, and 3.5 g of γ-glycidyloxypropyltrimethoxysilane were added to a reaction kettle and ultrasonically dispersed for 0.5 h, 10 g of nano-silicon dioxide was added, the pH was adjusted to 3, the temperature was controlled at 70°C, the reaction was kept warm for 3 h, centrifuged, washed with ethanol, and dried to obtain epoxidized silicon dioxide;

[0055] S2: 20 g of 3,5-dihydroxybenzoic acid, 40 g of potassium carbonate, and 1000 mL of N,N-dimethylformamide were added to a reaction bottle, the temperature was controlled at 75°C, and the mixture was kept warm for 20 min under stirring. 30 g of 1,3-bis(chloromethyl)-1,1,3,3-tetrakis(trimethylsilyloxy)disiloxane was added, and the mixture was kept warm for 60 h. The mixture was evaporated, tetrahydrofuran was added to dissolve the mixture, and a pH 3 hydrochloric acid aqueous solution was added to precipitate the mixture. The above dissolution and precipitation were repeated three times, and the precipitate was taken to obtain component 1.

[0056] S3: 10 g of epoxidized silica and 150 mL of dimethyl sulfoxide were added to a reaction kettle to swell for 9 h, 150 mL of deionized water was added, 30 wt % sodium hydroxide solution was added to adjust the pH to 10, 30 g of component 1 was added, the temperature was controlled at 75 ° C, the reaction was kept warm for 9 h, washed with water, and dried to obtain organic silica;

[0057] S4: Add 100g of 37wt% formaldehyde solution into a reactor, control the temperature at 40°C, add 20g of melamine, keep warm and stir for 20min, add 30wt% sodium hydroxide solution to adjust the pH to 8, control the temperature at 95°C, keep warm and react for 20min, add 8g of organic silica, keep warm and react for 2h, add water to adjust the solid content to 55%, cool and discharge, and obtain modified melamine formaldehyde resin.

[0058] Embodiment 3 The preparation method of modified melamine formaldehyde resin comprises the following steps:

[0059] S1: 180 mL of anhydrous ethanol, 20 mL of deionized water, and 5 g of γ-glycidyloxypropyltrimethoxysilane were added to a reaction kettle and ultrasonically dispersed for 1 h, 10 g of nano-silicon dioxide was added, the pH was adjusted to 4, the temperature was controlled at 80°C, the reaction was kept warm for 3-6 h, centrifuged, washed with ethanol, and dried to obtain epoxidized silicon dioxide;

[0060] S2: 30 g 3,5-dihydroxybenzoic acid, 45 g potassium carbonate, and 1500 mL N,N-dimethylformamide were added to a reaction bottle, the temperature was controlled at 80°C, and the mixture was kept warm for 30 min under stirring. 30 g 1,3-bis(chloromethyl)-1,1,3,3-tetrakis(trimethylsilyloxy)disiloxane was added, and the mixture was kept warm for 48-72 h. The mixture was evaporated by rotary evaporation, tetrahydrofuran was added to dissolve the mixture, and a pH 3 hydrochloric acid aqueous solution was added to precipitate the mixture. The above dissolution and precipitation were repeated three times, and the precipitate was taken to obtain component 1;

[0061] S3: 10 g of epoxidized silica and 200 mL of dimethyl sulfoxide were added to a reaction kettle to swell for 12 h, 200 mL of deionized water was added, 30 wt % sodium hydroxide solution was added to adjust the pH to 11, 40 g of component 1 was added, the temperature was controlled at 80 ° C, the reaction was kept warm for 12 h, washed with water, and dried to obtain organic silica;

[0062] S4: Add 100g of 37wt% formaldehyde solution into a reactor, control the temperature to 45°C, add 20g of melamine, keep warm and stir for 30min, add 30wt% sodium hydroxide solution to adjust the pH to 9, control the temperature to 95°C, keep warm and react for 30min, add 11.4g of organic silica, keep warm and react for 3h, add water to adjust the solid content to 55%, cool and discharge, and obtain modified melamine formaldehyde resin.

[0063] Example 4 Please refer to Figure 1 or Figure 2 A method for preparing a renewable formed board of an artificial board comprises the following steps:

[0064] A1: Preparation of melamine formaldehyde resin impregnated color 3: impregnating color paper in the modified melamine formaldehyde resin prepared in Example 1 to obtain melamine formaldehyde resin impregnated color paper 3 (impregnation amount is 100%);

[0065] A2: Preparation of embryo board substrate: Select a recycled artificial board with a smooth surface, remove the melamine formaldehyde resin impregnated colored paper that has been pressed on the surface of the recycled artificial board with a sander, and obtain substrate 1; coat the upper surface or lower surface of substrate 1 with melamine formaldehyde resin (coating amount is 50g / m 2 ) and then paving the original wood veneer 2 to obtain the base material composite board, or coating the upper and lower surfaces of the base material 1 with melamine formaldehyde resin (coating amount is 50g / m 2 ) and then paving the original wood veneer 2 to obtain a substrate composite board; arranging a PET anti-sticking isolation film on the upper surface and the lower surface of the substrate composite board to press the substrate composite board, the pressing temperature is 140° C., the pressure is 75 MPa, the pressing time is 5 min, and the PET anti-sticking isolation film is peeled off after pressing to obtain a embryo board substrate;

[0066] A3: A composite board is obtained by assembling a 3 mm thick thermally conductive silicone plate, a steel template, 3 melamine formaldehyde resin impregnated colored paper, a blank substrate, 3 melamine formaldehyde resin impregnated colored paper, a steel template, and a 3 mm thick thermally conductive silicone plate; the composite board is subjected to hot pressing to obtain a man-made board renewable molded board; the hot pressing temperature is 135°C, the pressure is 40 MPa, and the pressing time is 45 s.

[0067] Example 5, please refer to Figure 1 or Figure 2A method for preparing a renewable formed board of an artificial board comprises the following steps:

[0068] A1: Preparation of melamine formaldehyde resin impregnated color 3: impregnating color paper in the modified melamine formaldehyde resin prepared in Example 2 to obtain melamine formaldehyde resin impregnated color paper 3 (impregnation amount is 100%);

[0069] A2: Preparation of embryo board substrate: Select a recycled artificial board with a smooth surface, remove the melamine formaldehyde resin impregnated colored paper that has been pressed on the surface of the recycled artificial board with a sander, and obtain substrate 1; coat the upper surface or lower surface of substrate 1 with melamine formaldehyde resin (coating amount is 50g / m 2 ) and then paving the original wood veneer 2 to obtain the base material composite board, or coating the upper and lower surfaces of the base material 1 with melamine formaldehyde resin (coating amount is 50g / m 2 ) and then paving the original wood veneer 2 to obtain a substrate composite board; arranging a PET anti-sticking isolation film on the upper surface and the lower surface of the substrate composite board to press the substrate composite board, the pressing temperature is 140° C., the pressure is 75 MPa, the pressing time is 5 min, and the PET anti-sticking isolation film is peeled off after pressing to obtain a embryo board substrate;

[0070] A3: A composite board is obtained by assembling a 3 mm thick thermally conductive silicone plate, a steel template, 3 melamine formaldehyde resin impregnated colored paper, a blank substrate, 3 melamine formaldehyde resin impregnated colored paper, a steel template, and a 3 mm thick thermally conductive silicone plate; the composite board is subjected to hot pressing to obtain a man-made board renewable molded board; the hot pressing temperature is 135°C, the pressure is 40 MPa, and the pressing time is 45 s.

[0071] Example 6 Please refer to Figure 1 or Figure 2 A method for preparing a renewable formed board of an artificial board comprises the following steps:

[0072] A1: Preparation of melamine formaldehyde resin impregnated color 3: impregnating color paper in the modified melamine formaldehyde resin prepared in Example 3 to obtain melamine formaldehyde resin impregnated color paper 3 (impregnation amount is 100%);

[0073] A2: Preparation of embryo board substrate: Select a recycled artificial board with a smooth surface, remove the melamine formaldehyde resin impregnated colored paper that has been pressed on the surface of the recycled artificial board with a sander, and obtain substrate 1; coat the upper surface or lower surface of substrate 1 with melamine formaldehyde resin (coating amount is 50g / m 2 ) and then paving the original wood veneer 2 to obtain the base material composite board, or coating the upper and lower surfaces of the base material 1 with melamine formaldehyde resin (coating amount is 50g / m 2) and then paving the original wood veneer 2 to obtain a substrate composite board; arranging a PET anti-sticking isolation film on the upper surface and the lower surface of the substrate composite board to press the substrate composite board, the pressing temperature is 140° C., the pressure is 75 MPa, the pressing time is 5 min, and the PET anti-sticking isolation film is peeled off after pressing to obtain a embryo board substrate;

[0074] A3: A composite board is obtained by assembling a 3 mm thick thermally conductive silicone plate, a steel template, 3 melamine formaldehyde resin impregnated colored paper, a blank substrate, 3 melamine formaldehyde resin impregnated colored paper, a steel template, and a 3 mm thick thermally conductive silicone plate; the composite board is subjected to hot pressing to obtain a man-made board renewable molded board; the hot pressing temperature is 135°C, the pressure is 40 MPa, and the pressing time is 45 s.

[0075] Comparative Example 1 The preparation method of modified melamine formaldehyde resin comprises the following steps:

[0076] S1: 140 mL of anhydrous ethanol, 14 mL of deionized water, and 3.5 g of γ-glycidyloxypropyltrimethoxysilane were added to a reaction kettle and ultrasonically dispersed for 0.5 h, 10 g of nano-silicon dioxide was added, the pH was adjusted to 3, the temperature was controlled at 70°C, the reaction was kept warm for 3 h, centrifuged, washed with ethanol, and dried to obtain epoxidized silicon dioxide;

[0077] S2: 20 g of 3,5-dihydroxybenzoic acid, 40 g of potassium carbonate, and 1000 mL of N,N-dimethylformamide were added to a reaction bottle, the temperature was controlled at 75°C, and the mixture was kept warm for 20 min under stirring. 30 g of 1,3-bis(chloromethyl)-1,1,3,3-tetrakis(trimethylsilyloxy)disiloxane was added, and the mixture was kept warm for 60 h. The mixture was evaporated, tetrahydrofuran was added to dissolve the mixture, and a pH 3 hydrochloric acid aqueous solution was added to precipitate the mixture. The above dissolution and precipitation were repeated three times, and the precipitate was taken to obtain component 1.

[0078] S3: 10 g of epoxidized silica and 30 g of component 1 are mixed to obtain organic silica;

[0079] S4: Add 100g of 37wt% formaldehyde solution into a reactor, control the temperature at 40°C, add 20g of melamine, keep warm and stir for 20min, add 30wt% sodium hydroxide solution to adjust the pH to 8, control the temperature at 95°C, keep warm and react for 20min, add 8g of organic silica, keep warm and react for 2h, add water to adjust the solid content to 55%, cool and discharge, and obtain modified melamine formaldehyde resin.

[0080] Comparative Example 2 The preparation method of the modified melamine formaldehyde resin comprises the following steps:

[0081] S1: 140 mL of anhydrous ethanol, 14 mL of deionized water, and 3.5 g of γ-glycidyloxypropyltrimethoxysilane were added to a reaction kettle and ultrasonically dispersed for 0.5 h, 10 g of nano-silicon dioxide was added, the pH was adjusted to 3, the temperature was controlled at 70°C, the reaction was kept warm for 3 h, centrifuged, washed with ethanol, and dried to obtain epoxidized silicon dioxide;

[0082] S2: Add 100g of 37wt% formaldehyde solution into a reactor, control the temperature at 40°C, add 20g of melamine, keep warm and stir for 20min, add 30wt% sodium hydroxide solution to adjust the pH to 8, control the temperature at 95°C, keep warm and react for 20min, add 8g of epoxidized silica, keep warm and react for 2h, add water to adjust the solid content to 55%, cool and discharge, and obtain modified melamine formaldehyde resin.

[0083] Comparative Example 3 The preparation method of the modified melamine formaldehyde resin comprises the following steps:

[0084] S1: 20 g of 3,5-dihydroxybenzoic acid, 40 g of potassium carbonate, and 1000 mL of N,N-dimethylformamide were added to a reaction bottle, the temperature was controlled at 75°C, and the mixture was kept warm for 20 min under stirring. 30 g of 1,3-bis(chloromethyl)-1,1,3,3-tetrakis(trimethylsilyloxy)disiloxane was added, and the mixture was kept warm for 60 h. The mixture was evaporated by rotary evaporation, tetrahydrofuran was added to dissolve the mixture, and a pH 3 hydrochloric acid aqueous solution was added to precipitate the mixture. The above dissolution and precipitation were repeated three times, and the precipitate was taken to obtain component 1;

[0085] S2: 10 g of nano-silicon dioxide and 150 mL of dimethyl sulfoxide were added to a reaction kettle to swell for 9 h, 150 mL of deionized water was added, 30 wt % of sodium hydroxide solution was added to adjust the pH to 10, 30 g of component 1 was added, the temperature was controlled at 75 ° C, the reaction was kept warm for 9 h, washed with water, and dried to obtain organic silicon dioxide;

[0086] S4: Add 100g of 37wt% formaldehyde solution into a reactor, control the temperature at 40°C, add 20g of melamine, keep warm and stir for 20min, add 30wt% sodium hydroxide solution to adjust the pH to 8, control the temperature at 95°C, keep warm and react for 20min, add 8g of organic silica, keep warm and react for 2h, add water to adjust the solid content to 55%, cool and discharge, and obtain modified melamine formaldehyde resin.

[0087] Comparative Example 4 The preparation method of the modified melamine formaldehyde resin comprises the following steps:

[0088] S1: 20 g of 3,5-dihydroxybenzoic acid, 40 g of potassium carbonate, and 1000 mL of N,N-dimethylformamide were added to a reaction bottle, the temperature was controlled at 75°C, and the mixture was kept warm for 20 min under stirring. 30 g of 1,3-bis(chloromethyl)-1,1,3,3-tetrakis(trimethylsilyloxy)disiloxane was added, and the mixture was kept warm for 60 h. The mixture was evaporated by rotary evaporation, tetrahydrofuran was added to dissolve the mixture, and a pH 3 hydrochloric acid aqueous solution was added to precipitate the mixture. The above dissolution and precipitation were repeated three times, and the precipitate was taken to obtain component 1;

[0089] S2: Add 100g of 37wt% formaldehyde solution into a reactor, control the temperature at 40°C, add 20g of melamine, stir and keep warm for 20min, add 30wt% sodium hydroxide solution to adjust the pH to 8, control the temperature at 95°C, keep warm for 20min, add 8g of component 1, keep warm for 2h, add water to adjust the solid content to 55%, cool and discharge, and obtain modified melamine formaldehyde resin.

[0090] Comparative Example 5, please refer to Figure 1 or Figure 2 A method for preparing a renewable formed board of an artificial board comprises the following steps:

[0091] A1: Preparation of melamine formaldehyde resin impregnated color 3: impregnating color paper in the modified melamine formaldehyde resin prepared in Comparative Example 1 to obtain melamine formaldehyde resin impregnated color paper 3 (impregnation amount is 100%);

[0092] A2: Preparation of embryo board substrate: Select a recycled artificial board with a smooth surface, remove the melamine formaldehyde resin impregnated colored paper that has been pressed on the surface of the recycled artificial board with a sander, and obtain substrate 1; coat the upper surface or lower surface of substrate 1 with melamine formaldehyde resin (coating amount is 50g / m 2 ) and then paving the original wood veneer 2 to obtain the base material composite board, or coating the upper and lower surfaces of the base material 1 with melamine formaldehyde resin (coating amount is 50g / m 2 ) and then paving the original wood veneer 2 to obtain a substrate composite board; arranging a PET anti-sticking isolation film on the upper surface and the lower surface of the substrate composite board to press the substrate composite board, the pressing temperature is 140° C., the pressure is 75 MPa, the pressing time is 5 min, and the PET anti-sticking isolation film is peeled off after pressing to obtain a embryo board substrate;

[0093] A3: A composite board is obtained by assembling a 3 mm thick thermally conductive silicone plate, a steel template, 3 melamine formaldehyde resin impregnated colored paper, a blank substrate, 3 melamine formaldehyde resin impregnated colored paper, a steel template, and a 3 mm thick thermally conductive silicone plate; the composite board is subjected to hot pressing to obtain a man-made board renewable molded board; the hot pressing temperature is 135°C, the pressure is 40 MPa, and the pressing time is 45 s.

[0094] Comparative Example 6 Please refer to Figure 1 or Figure 2 A method for preparing a renewable formed board of an artificial board comprises the following steps:

[0095] A1: Preparation of melamine formaldehyde resin impregnated color 3: impregnating color paper in the modified melamine formaldehyde resin prepared in Comparative Example 2 to obtain melamine formaldehyde resin impregnated color paper 3 (impregnation amount is 100%);

[0096] A2: Preparation of embryo board substrate: Select a recycled artificial board with a smooth surface, remove the melamine formaldehyde resin impregnated colored paper that has been pressed on the surface of the recycled artificial board with a sander, and obtain substrate 1; coat the upper surface or lower surface of substrate 1 with melamine formaldehyde resin (coating amount is 50g / m 2 ) and then paving the original wood veneer 2 to obtain the base material composite board, or coating the upper and lower surfaces of the base material 1 with melamine formaldehyde resin (coating amount is 50g / m 2 ) and then paving the original wood veneer 2 to obtain a substrate composite board; arranging a PET anti-sticking isolation film on the upper surface and the lower surface of the substrate composite board to press the substrate composite board, the pressing temperature is 140° C., the pressure is 75 MPa, the pressing time is 5 min, and the PET anti-sticking isolation film is peeled off after pressing to obtain a embryo board substrate;

[0097] A3: A composite board is obtained by assembling a 3 mm thick thermally conductive silicone plate, a steel template, 3 melamine formaldehyde resin impregnated colored paper, a blank substrate, 3 melamine formaldehyde resin impregnated colored paper, a steel template, and a 3 mm thick thermally conductive silicone plate; the composite board is subjected to hot pressing to obtain a man-made board renewable molded board; the hot pressing temperature is 135°C, the pressure is 40 MPa, and the pressing time is 45 s.

[0098] Please refer to Comparative Example 7 Figure 1 or Figure 2 A method for preparing a renewable formed board of an artificial board comprises the following steps:

[0099] A1: Preparation of melamine formaldehyde resin impregnated color 3: impregnating color paper in the modified melamine formaldehyde resin prepared in Comparative Example 3 to obtain melamine formaldehyde resin impregnated color paper 3 (impregnation amount is 100%);

[0100] A2: Preparation of embryo board substrate: Select a recycled artificial board with a smooth surface, remove the melamine formaldehyde resin impregnated colored paper that has been pressed on the surface of the recycled artificial board with a sander, and obtain substrate 1; coat the upper surface or lower surface of substrate 1 with melamine formaldehyde resin (coating amount is 50g / m 2 ) and then paving the original wood veneer 2 to obtain the base material composite board, or coating the upper and lower surfaces of the base material 1 with melamine formaldehyde resin (coating amount is 50g / m 2) and then paving the original wood veneer 2 to obtain a substrate composite board; arranging a PET anti-sticking isolation film on the upper surface and the lower surface of the substrate composite board to press the substrate composite board, the pressing temperature is 140° C., the pressure is 75 MPa, the pressing time is 5 min, and the PET anti-sticking isolation film is peeled off after pressing to obtain a embryo board substrate;

[0101] A3: A composite board is obtained by assembling a 3 mm thick thermally conductive silicone plate, a steel template, 3 melamine formaldehyde resin impregnated colored paper, a blank substrate, 3 melamine formaldehyde resin impregnated colored paper, a steel template, and a 3 mm thick thermally conductive silicone plate; the composite board is subjected to hot pressing to obtain a man-made board renewable molded board; the hot pressing temperature is 135°C, the pressure is 40 MPa, and the pressing time is 45 s.

[0102] Comparative Example 8, please refer to Figure 1 or Figure 2 A method for preparing a renewable formed board of an artificial board comprises the following steps:

[0103] A1: Preparation of melamine formaldehyde resin impregnated color 3: impregnating color paper in the modified melamine formaldehyde resin prepared in Comparative Example 4 to obtain melamine formaldehyde resin impregnated color paper 3 (impregnation amount is 100%);

[0104] A2: Preparation of embryo board substrate: Select a recycled artificial board with a smooth surface, remove the melamine formaldehyde resin impregnated colored paper that has been pressed on the surface of the recycled artificial board with a sander, and obtain substrate 1; coat the upper surface or lower surface of substrate 1 with melamine formaldehyde resin (coating amount is 50g / m 2 ) and then paving the original wood veneer 2 to obtain the base material composite board, or coating the upper and lower surfaces of the base material 1 with melamine formaldehyde resin (coating amount is 50g / m 2 ) and then paving the original wood veneer 2 to obtain a substrate composite board; arranging a PET anti-sticking isolation film on the upper surface and the lower surface of the substrate composite board to press the substrate composite board, the pressing temperature is 140° C., the pressure is 75 MPa, the pressing time is 5 min, and the PET anti-sticking isolation film is peeled off after pressing to obtain a embryo board substrate;

[0105] A3: A composite board is obtained by assembling a 3 mm thick thermally conductive silicone plate, a steel template, 3 melamine formaldehyde resin impregnated colored paper, a blank substrate, 3 melamine formaldehyde resin impregnated colored paper, a steel template, and a 3 mm thick thermally conductive silicone plate; the composite board is subjected to hot pressing to obtain a man-made board renewable molded board; the hot pressing temperature is 135°C, the pressure is 40 MPa, and the pressing time is 45 s.

[0106] Performance Testing

[0107] (1) Storage stability: The resins prepared in Examples 1-3 and Comparative Examples 1-4 were placed in an iodine volumetric flask and placed in a drying oven at a constant temperature of 25° C. The viscosity and color changes of the resins were observed every 24 hours. When the resins became turbid gel, the event was recorded, which was the storage stability of the resins. The test results are shown in Table 1.

[0108] Table 1: Statistical table of performance test data of Examples 1-3 and Comparative Examples 1-4

[0109] Storage time / d Curing time / (100℃,s) Example 1 19 300 Example 2 20 290 Example 3 17 290 Comparative Example 1 5 340 Comparative Example 2 6 360 Comparative Example 3 4 450 Comparative Example 4 7 420

[0110] It can be seen from Table 1 that the modified melamine formaldehyde resin prepared in the present application has good storage stability, and the curing speed is fast when used as an impregnation liquid for color paper, which effectively improves the processing efficiency.

[0111] (2) According to the test of surface bonding strength, surface high temperature resistance, surface pollution resistance, surface crack resistance and water vapor resistance in GB / T 17657-2013 "Test methods for physical and chemical properties of wood-based panels and veneer wood-based panels", the test results are shown in Table 2;

[0112] Table 2: Statistical table of performance test data of Examples 1-3 and Comparative Examples 1-4

[0113]

[0114] It can be seen from Table 2 that the modified melamine formaldehyde resin prepared in the present application, as an impregnation liquid for color paper, gives the color paper good bonding strength; and the impregnated color paper, as a surface material for artificial boards, has good high temperature resistance, stain resistance, and water vapor resistance, greatly improving the service life of the artificial boards.

[0115] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A renewable shaped board of artificial board, characterized in that: The board is obtained by assembling colored paper impregnated with melamine formaldehyde resin and a base plate, or the board is obtained by assembling colored paper impregnated with melamine formaldehyde resin, a base plate and colored paper impregnated with melamine formaldehyde resin; The embryo board substrate comprises a substrate and veneer, wherein the substrate is obtained by grinding recycled artificial boards, and the veneer is paved on the upper surface or the lower surface, or the upper surface and the lower surface of the substrate; Melamine formaldehyde resin impregnated color paper is obtained by impregnating the color paper in modified melamine formaldehyde resin; The preparation method of the modified melamine formaldehyde resin comprises the following steps: S1: Add 3,5-dihydroxybenzoic acid, potassium carbonate and N,N-dimethylformamide to a reaction bottle, control the temperature to 70-80°C, keep warm for 10-30 minutes under stirring, add 1,3-bis(chloromethyl)-1,1,3,3-tetrakis(trimethylsilyloxy)disiloxane, keep warm for 48-72 hours, rotary evaporate and post-treat to obtain component 1; S2: Add epoxidized silica and dimethyl sulfoxide to a reaction kettle and swell for 6-12 hours, add deionized water, adjust the pH to 10-11, add component 1, control the temperature to 70-80°C, keep the temperature for reaction for 6-12 hours, wash with water, and dry to obtain organic silica; S3: Add the formaldehyde solution into the reaction kettle, control the temperature at 35-45°C, add melamine, keep warm and stir for 10-30 minutes, adjust the pH to 8-9, control the temperature at 90-95°C, keep warm and react for 10-30 minutes, add organic silicon dioxide, keep warm and react for 1-3 hours, add water, cool and discharge, and obtain modified melamine formaldehyde resin.

2. The renewable shaped board of artificial board according to claim 1, characterized in that: A glue layer is arranged between the base material and the veneer.

3. The renewable shaped board of artificial board according to claim 1, characterized in that: The addition ratio of 3,5-dihydroxybenzoic acid, potassium carbonate, N,N-dimethylformamide, and 1,3-bis(chloromethyl)-1,1,3,3-tetrakis(trimethylsilyloxy)disiloxane in S1 is 0.5-1 g: 1-1.5 g: 10-50 mL: 1 g.

4. The renewable shaped board of artificial board according to claim 1, characterized in that: The addition ratio of epoxidized silica, 20 mL of dimethyl sulfoxide, 20 mL of deionized water, and component one in S2 is 1 g: 10-20 mL: 10-20 mL: 2-4 g.

5. The renewable shaped board of artificial board according to claim 1, characterized in that: The formaldehyde solution in S3 is a 37wt% formaldehyde aqueous solution; the modified silicon dioxide accounts for 5-10% of the total mass of formaldehyde and melamine; and the molar ratio of formaldehyde:melamine is 1.6-2.05:

1.

6. A method for preparing a renewable shaped board of artificial board according to any one of claims 1 to 5, characterized in that: The steps include: A1: Select a recycled artificial board with a smooth surface, and use a sanding machine to sand the melamine formaldehyde resin impregnated color paper layer on the surface at least once until a white color paper layer remains on the surface to increase the bonding performance, and obtain the base material; A2: paving veneer on the upper surface or the lower surface of the substrate, or paving veneer on the upper surface and the lower surface of the substrate, with an adhesive layer provided between the substrate and the veneer, to obtain a substrate composite board; pressing the substrate composite board to obtain a green board substrate; A3: A composite board is obtained by assembling colored paper impregnated with melamine formaldehyde resin and base paper of embryonic board, or a composite board is obtained by assembling colored paper impregnated with melamine formaldehyde resin, base paper of embryonic board and colored paper impregnated with melamine formaldehyde resin; the composite board is subjected to hot pressing to obtain a renewable molded board of artificial board.

7. The method for preparing a renewable formed board of artificial board according to claim 6, characterized in that: In step A2, the hot pressing temperature is 135-140° C., the pressure is 30-40 MPa, and the pressing time is 45-90 s; The pressing temperature in step A3 is 135-140° C., the pressure is 60-75 MPa, and the pressing time is 5-20 min.

8. The method for preparing a renewable formed board of artificial board according to claim 6, characterized in that: The adhesive layer is obtained by coating an adhesive on the surface of the substrate, and the coating amount of the adhesive is 10-60g / m; the adhesive is any one of melamine formaldehyde resin, white latex, all-purpose glue, PUR glue, polyurethane resin adhesive, acrylic resin adhesive, and epoxy resin adhesive; PET anti-sticking isolation films are arranged on the upper surface and the lower surface of the substrate composite board before pressing, and the PET anti-sticking isolation films are peeled off after the substrate composite board is pressed.

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