Environment-friendly low-formaldehyde furniture board

Abstract

The invention discloses an environment-friendly low-formaldehyde furniture board, which belongs to the technical field of furniture boards, and comprises a plain board and impregnated paper, each side surface of the plain board is covered with the gummed paper; the impregnated paper comprises the following components: raw paper for decoration, an impregnation group and a synergistic formaldehyde removal agent group, the base paper for decoration is decorative paper printed with patterns and used for conventional furniture boards; the gum dipping group is urea-formaldehyde resin; the synergistic formaldehyde removal agent group comprises the following components: a diamine compound, urea, deionized water, ethanolamine and sodium citrate. The synergistic aldehyde removal group in the gummed paper covering and attached to the periphery of the plain board contains-NH2 / -NH; the-NH2 / -NH is a functional group capable of effectively adsorbing formaldehyde pollutants; therefore, the environment-friendly low-formaldehyde furniture board solves the technical problem of how to improve the environmental protection property of the furniture board.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of furniture boards, and particularly relates to an environmentally-friendly low-formaldehyde furniture board. BACKGROUND

[0002] The furniture board refers to a man-made or natural wood material used for making the main structure or surface decoration of furniture, which is usually processed by pressing, splicing and other processes from wood, fiber, adhesive and other raw materials. Common types include density board, shaving board, plywood, fine woodworking board and solid wood board, etc., which have the characteristics of strong stability, easy processing, controllable cost, etc., and are widely used in the production of furniture parts such as cabinet body, table top, partition, etc., and meet the functional and decorative requirements.

[0003] Specifically, formaldehyde is an important chemical raw material, which is widely used in the production of building materials, interior decoration materials or furniture boards, etc. A large amount of urea-formaldehyde resin, i.e. urea-formaldehyde adhesive or melamine-formaldehyde resin, or triamine adhesive is generally used as an adhesive in the production process of these materials, and formaldehyde is one of the main raw materials for preparing urea-formaldehyde adhesive or triamine adhesive. Formaldehyde gas has strong irritability to human mucous membranes and skin, and after entering the human body through the respiratory system, it can damage organs and tissues such as liver, lung and blood. Since formaldehyde has the three effects of carcinogenesis, teratogenesis and mutagenesis, long-term inhalation of formaldehyde vapor can easily cause major diseases such as nasopharyngeal carcinoma and acute leukemia. Long-term exposure of the human body to a low-concentration formaldehyde-polluted environment can cause chronic poisoning, and symptoms such as repeated tearing, conjunctival congestion, coughing, acute bronchitis, etc. occur repeatedly, and severe cases can have acute symptoms such as nausea, vomiting and gastrointestinal discomfort. It has toxic effects on the respiratory system, nervous system, cardiovascular system, endocrine system, etc.

[0004] Therefore, the Chinese patent document with the publication number CN107183970B discloses a furniture board, which comprises a base plate composed of board filling particles and an edge covering material wrapped around the board filling particles, the base plate is provided with a through release hole; a pair of adsorption plates are arranged on the upper surface and the lower surface of the base plate, and the adsorption plates are clamped and fixed on the base plate by clamping pieces, the adsorption plate comprises a flat plate type frame structure combined by one top plate and four side plates, the top plate and the four side plates are made of plastic plates, one side of the adsorption plate opposite to the top plate is closed by a detachable paper shell plate, the paper shell plate is provided with a plurality of adsorption holes, and the flat plate type frame structure is filled with formaldehyde adsorption material. The furniture board is provided with the adsorption plates on the upper surface and the lower surface of the base plate, the adsorption plates are filled with formaldehyde adsorption particles, which can adsorb the formaldehyde released from the base plate, thereby reducing the formaldehyde content in the base plate and improving the safety in use of the furniture board.

[0005] However, the furniture board disclosed above still has the technical problem of insufficient adsorption efficiency. Specifically, due to the limitation of production process, the urea-formaldehyde glue or triamine glue usually contains unreacted free formaldehyde, so the building materials, decorative materials or furniture also contain unreacted free formaldehyde, which is gradually released into the surrounding environment in the form of steam, and the release period can be more than ten years. In addition, the formaldehyde content of some unqualified building materials or furniture is even more serious, which will cause more serious indoor formaldehyde pollution problem and greater harm to human health. The formaldehyde release amount of building materials or boards increases with the increase of the molar ratio of formaldehyde used in the production of adhesives. Many studies have shown that the formaldehyde release process of building materials and furniture is also affected by the surrounding environmental conditions, such as temperature, humidity, air pressure, etc. The existing technology shows that high temperature or high humidity environment will accelerate the release process of formaldehyde in wood composite materials, and the release rate and amount of formaldehyde will increase obviously with the increase of temperature or humidity. Therefore, how to reduce the formaldehyde content in the board and improve the self-absorption capacity of the board to formaldehyde is a technical problem to be solved in the field of furniture board at present. SUMMARY

[0006] Therefore, it is necessary to provide an environmentally friendly low formaldehyde furniture board for solving the technical problem of improving the environmental performance of furniture board.

[0007] An environmentally friendly low formaldehyde furniture board comprises a substrate and impregnated paper, each side of the substrate is covered with the impregnated paper, the components of the impregnated paper include decorative base paper, impregnated group and synergistic aldehyde removal agent group, the decorative base paper is a conventional decorative paper for furniture board with printed patterns, the impregnated group is urea-formaldehyde resin, and the components of the synergistic aldehyde removal agent group include diamine compound, urea, deionized water, ethanolamine and sodium citrate.

[0008] Specifically, the urea-formaldehyde resin used in the impregnated group is modified urea-formaldehyde resin, and the components of the modified urea-formaldehyde resin are 37% formaldehyde solution 420 parts, urea 222 parts, melamine 8% of the total amount of urea, polyvinyl alcohol 1.5 parts and oxidized starch 5 parts.

[0009] Specifically, the urea-formaldehyde resin used in the impregnated group is modified urea-formaldehyde resin, and the components of the modified urea-formaldehyde resin are 37% formaldehyde solution 350 parts, urea 216 parts, melamine 5% of the total amount of urea, resorcinol 2 parts and lignin 10 parts.

[0010] Specifically, the urea-formaldehyde resin used in the impregnated group is modified urea-formaldehyde resin, and the components of the modified urea-formaldehyde resin are 37% formaldehyde solution 400 parts, urea 211 parts, melamine 6 parts, ammonium chloride 1.5 parts and activated carbon 0.5 parts.

[0011] Specifically, the components of the synergistic aldehyde removal agent group are as follows in terms of mass parts: synergistic aldehyde removal main agent, 3-4 parts; L-arginine, 0.5-1 part; magnesium chloride, 0.3 part; and amino-terminated hyperbranched polyamide, 0.5 part; wherein the components of each part of the synergistic aldehyde removal main agent are as follows: diamine compound, 10 parts; urea, 8 parts; deionized water, 5.6 parts; ethanolamine, 0.5 part; and sodium citrate, 0.3 part.

[0012] Specifically, the components of the synergistic aldehyde removal agent group are as follows in terms of mass parts: imidazolone powder, 10 parts; silver-loaded nano-titanium dioxide, 0.2 part; adipic acid dihydrazide, 1 g; and fatty alcohol polyoxyethylene ether, 0.1 g.

[0013] Specifically, the components of the synergistic aldehyde removal agent group are as follows in terms of mass parts: ethylene urea, 8 parts; sodium citrate, 0.5 part; and sodium lauryl polyoxyethylene ether sulfate, 2 parts.

[0014] Specifically, the components of the synergistic aldehyde removal agent group are as follows in terms of mass parts: 20% imidazolidone aqueous solution, 25 ml; acetylacetone, 2 ml; and ethanolamine, 5%.

[0015] In summary, the present application relates to an environmentally friendly low-formaldehyde furniture board, which comprises a base plate and impregnated paper; each side of the base plate is covered with the impregnated paper; the components of the impregnated paper include decorative base paper, impregnated group, and synergistic aldehyde removal agent group; the decorative base paper is a conventional decorative paper for furniture boards with printed patterns; the impregnated group is urea-formaldehyde resin; and the components of the synergistic aldehyde removal agent group include diamine compound, urea, deionized water, ethanolamine, and sodium citrate. The synergistic aldehyde removal agent group in the impregnated paper attached to the periphery of the base plate contains -NH2 / -NH in its components; -NH2 / -NH is a functional group that can effectively adsorb formaldehyde pollutants; and to reduce the release of formaldehyde, the following techniques can be used for optimization: 1. Adjusting the raw material ratio, reducing the formaldehyde / urea molar ratio, and the traditional process is formaldehyde excess, which can reduce the source of free formaldehyde; 2. Adding modifiers, mixing melamine to form "melamine modified urea-formaldehyde resin", thereby improving water resistance and bonding strength; adding formaldehyde capture agents such as urea and resorcinol to neutralize free formaldehyde; 3. Process innovation, for example, the pH value can be controlled to neutral, such as 7-7.5, and additives such as glue treasure are introduced to reduce the content of free aldehyde. Therefore, the present application relates to an environmentally friendly low-formaldehyde furniture board, which solves the technical problem of how to improve the environmental friendliness of furniture boards. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 FIG. 1 is a structural schematic diagram of the present application, an environmentally friendly low-formaldehyde furniture board; Figure 2The preparation method flowchart of the impregnated paper of the environment-friendly low-formaldehyde furniture plate. DETAILED DESCRIPTION

[0017] In order to make the above objectives, characteristics and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without using some or all of these specific details, and that the present application is not limited to the specific embodiments disclosed below.

[0018] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0019] In addition, the terms "first", "second", "third" and the like are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0020] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0021] In the present invention, unless otherwise explicitly specified and limited, a first feature is "on" or "under" a second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "over", "above" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. The first feature "under", "below" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is horizontally lower than the second feature.

[0022] It should be noted that when an element is referred to as being "fixed to" or "set to" another element, it can be directly on the other element or there can be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation.

[0023] Specifically, please refer to Figure 1 The present invention is an environmentally friendly low formaldehyde furniture board, which comprises the following components: a blank 1 and a dipped paper 2; each side of the blank 1 is covered with the dipped paper 2; the components of the dipped paper 2 include: a decorative base paper, a dipped glue group and a synergistic aldehyde removal agent group; the decorative base paper is a conventional decorative paper for furniture boards with patterns printed on it; the dipped glue group is urea-formaldehyde resin; the components of the synergistic aldehyde removal agent group include: a diamine compound, urea, deionized water, ethanolamine and sodium citrate.

[0024] Specifically, the aforementioned blank 1 is a common board commonly used in the field of furniture boards. This type of common board generally uses a large amount of urea-formaldehyde resin, i.e. urea-formaldehyde glue or melamine-formaldehyde resin, or triamine glue as an adhesive during the production process, and formaldehyde is one of the main raw materials for preparing urea-formaldehyde glue or triamine glue. The synergistic aldehyde removal agent group in the dipped paper attached to the periphery of the blank contains -NH2 / -NH in its components; -NH2 / -NH is a functional group that can effectively adsorb formaldehyde pollutants, but the reactivity between amino compounds with different chemical structural characteristics and formaldehyde molecules differs significantly because the nucleophilicity of -H2 / -NH changes under different chemical environments, ultimately affecting the aldehyde removal performance of amino compounds. Therefore, the present invention proposes a synergistic aldehyde removal agent group, the components of which include: a diamine compound, urea, deionized water, ethanolamine and sodium citrate. The diamine compound can be a diamine compound such as hexamethylene diamine, diethylene diamine, triethylene diamine or m-phenylenediamine.

[0025] Specifically, the components of the impregnated paper 2 include: a decorative base paper, an impregnated group, and an aldehyde removal agent group; the decorative base paper is a conventional decorative paper for furniture boards printed with patterns; the impregnated group is urea-formaldehyde resin, which is a thermosetting resin adhesive synthesized by polycondensation of urea and formaldehyde, and is used for impregnation treatment of decorative paper after modification, and finally forms a veneer layer on the surface of the board through hot pressing. The urea-formaldehyde resin is usually generated by the condensation reaction of urea and formaldehyde in the presence of a catalyst under the action of alkaline or acidic, and then forms an insoluble final resin adhesive through a curing agent. The appearance is usually white powder or transparent liquid. In order to reduce the release of formaldehyde, the following techniques can be used for optimization: 1. Adjust the raw material ratio, reduce the formaldehyde / urea molar ratio, the traditional process is formaldehyde excess, thus reducing the source of free formaldehyde; 2. Add a modifier, mix melamine to form "melamine modified urea-formaldehyde resin", thereby improving water resistance and bonding strength; add formaldehyde capture agent, such as urea, resorcinol, to neutralize free formaldehyde; 3. Process innovation, for example, the pH value can be controlled to neutral, such as 7-7.5, and additives such as glyduran are introduced to reduce the content of free aldehyde.

[0026] More specifically, for the above-mentioned addition of a modifier, melamine is mixed to form "melamine modified urea-formaldehyde resin", thereby improving water resistance and bonding strength; the mechanism of action is: 1. Melamine modification mechanism, by introducing melamine containing triazine ring, co-condensation with urea-formaldehyde resin, forming a more stable cross-linked network structure, significantly improving water resistance and bonding strength; batch addition of melamine can optimize the reaction process: first addition promotes hydroxymethylation reaction, second addition enhances co-condensation effect. 2. The effect of formaldehyde capture agent, urea, resorcinol and other capture agents react with free formaldehyde to generate stable compounds such as hydroxymethyl urea, reducing the content of free formaldehyde in the resin to below 0.3%; resorcinol can also participate in resin curing to improve the aging resistance of the glue layer.

[0027] Therefore, the following are specific formula examples of modified urea-formaldehyde resin: Modified urea-formaldehyde resin example 1: High water-resistant MUF resin, the raw material ratio is as follows in mass parts: Formaldehyde (37%), i.e. 37% formaldehyde aqueous solution, same below: 420 parts; Urea (in three batches): 222 parts, of which the first batch is 40%, the second batch is 50%, and the third batch is 10%; Melamine: 8% of the total amount of urea; Polyvinyl alcohol (PVA): 1.5 parts (toughening); Oxidized starch: 5 parts (initial adhesion improvement).

[0028] The process points of the high water-resistant MUF resin are as follows: the formaldehyde is adjusted to pH 8.3, the first batch of urea and melamine is added, and reaction is carried out at 85°C for 40 minutes; the pH is adjusted to 5.2, PVA and the second batch of urea are added, and the temperature is kept for 90 minutes; after neutralization, the third batch of urea and oxidized starch are added, and the temperature is lowered to discharge.

[0029] Modified urea-formaldehyde resin example 2 The low-aldehyde environmentally friendly resin has the following raw material ratio by mass fraction: Formaldehyde (37%): 350 parts; Urea: formaldehyde molar ratio is 1:1.2; that is, urea is 216 parts; Melamine: 5% of the amount of urea; Resorcinol: 2 parts (formaldehyde scavenger); Lignin: 10 parts (biomass modification).

[0030] The process points of the low-aldehyde environmentally friendly resin are as follows: formaldehyde is premixed with lignin, urea and melamine are added, and reaction is carried out at pH 8.0 for 30 minutes; resorcinol is added in the acid stage, and the viscosity is reduced to the standard; the final pH is adjusted to 7.5, and the free formaldehyde is ≤0.2%.

[0031] Modified urea-formaldehyde resin example 3 Fast curing resin, the raw material ratio is as follows by mass fraction: Formaldehyde (37%): 400 parts; Urea: 211 parts; divided into two batches, the first batch accounts for 60%, and the second batch accounts for 40%; Melamine: 6 parts; Ammonium chloride: 1.5 parts (curing accelerator); Activated carbon: 0.5 parts (adsorption of free aldehyde).

[0032] The process points of the fast curing resin are as follows: after the formaldehyde reacts with the first batch of urea, melamine and ammonium chloride are added, and polycondensation is carried out at 85°C for 60 minutes; the second batch of urea and activated carbon are added, the temperature is lowered to 40°C to discharge, and the curing time is shortened by 20%.

[0033] Further, with the conventional urea-formaldehyde resin as Comparative Example 1, and the formulations of the modified urea-formaldehyde resin examples 1-3 being as described above, the water resistance and bonding strength improvement effects of the modified urea-formaldehyde resin are shown in Table 1.

[0034] Table 1: Effect comparison of modified urea-formaldehyde resin

[0035] Based on the experimental data in Table 1, it can be seen that the boiling water resistance time of Comparative Example 1 is significantly lower than that of the examples, with an average of 40-60% lower. The traditional urea-formaldehyde resin has low crosslinking density and insufficient water resistance, and is easily degraded under hydrolysis conditions. The high water resistance of Example 1 is due to the modification of melamine and the high molar ratio design. For the bonding strength, Comparative Example 1 has the lowest strength because it does not use a toughening agent such as polyvinyl alcohol or copolymer modification, and the glue layer is brittle; the strength of Example 1 is the highest, benefiting from the rigid structure of melamine. For free formaldehyde, Comparative Example 1 has a free formaldehyde content of 0.6%, due to the high formaldehyde: urea molar ratio and the lack of formaldehyde scavengers such as resorcinol; Example 2 has a free formaldehyde content of 0.2%, which is the optimal value, due to the low molar ratio and the use of formaldehyde scavengers.

[0036] Therefore, it can be said that all examples are superior to traditional resins in terms of water resistance, strength and environmental friendliness, with Example 2 performing best in free formaldehyde control and Example 1 being the most optimal in terms of water resistance and strength.

[0037] In particular, with reference to the above Figure 2 For conventional impregnated paper, the preparation process is as follows: the patterned decorative paper needs to be treated twice with glue. The first impregnation is with urea-formaldehyde resin, and the first drying is at a temperature of 145°C for about 20s. At this time, the glue on the paper surface is not completely dry and still has some stickiness, which is to ensure that the resin can penetrate into the paper smoothly during the second impregnation. During the second impregnation, the melamine-formaldehyde resin is evenly coated on the decorative paper treated by the first impregnation process by a coating machine, and then dried in a 145°C air drying oven for about 40s to obtain the impregnated paper. Finally, the impregnated paper is attached to the surface of the board by hot pressing in the press factory to obtain the finished furniture board.

[0038] Further, the imidazolone aldehyde scavenger, as an added formaldehyde adsorbent, can be uniformly dispersed and dissolved in the melamine-formaldehyde resin and used in the production of impregnated paper, so that the final furniture board has the property of capturing free formaldehyde, thereby reducing the formaldehyde emission of the furniture. Therefore, the adaptability of the imidazolone aldehyde scavenger to the melamine-formaldehyde resin is crucial, mainly reflected in two aspects: the solubility of the aldehyde scavenger in the resin and the effect on the setting time of the resin. Good solubility of the aldehyde scavenger in the melamine-formaldehyde resin can prevent the generation of precipitates and avoid the influence of precipitates on the appearance of the impregnated paper. The setting time reflects the curing characteristics of the resin after adding the aldehyde scavenger, and is the key to ensure the successful production of impregnated paper.

[0039] Thus, a preparation method of a conventional imidazolone aldehyde removal agent is as follows: a diamine compound, 10 g, urea, 8 g, and deionized water, 5.6 mL are added into a 100 mL round-bottom flask provided with a condenser, stirred at 60°C for 30 min until the solid matter is completely dissolved, gradually heated to 120°C, kept for 1 h, then continuously heated to 180C, and refluxed for 4 h, after the reaction is completed, naturally cooled to room temperature, filtered to obtain white solid matter, washed with petroleum ether for 2-3 times, and the white solid matter obtained by filtration is dried in a 60°C electric thermostat drying box for 12 h, and finally obtained white powder is the imidazolone aldehyde removal agent.

[0040] To this end, the present application of an environmentally friendly low formaldehyde furniture plate improves the imidazolone aldehyde removal agent, focuses on improving its solubility in melamine-formaldehyde resin and controlling the resin setting time, and the core of the formula improvement is: adding a polar solvent auxiliary component: in the original diamine compound (10 g), urea (8 g) and deionized water (5.6 mL) system, 5% ethanolamine (0.5 g) is introduced as a cosolvent, the hydroxyl and amino groups can enhance the hydrogen bonding with the resin and promote the uniformity of dissolution; in addition, a setting regulator is also introduced: 0.3 g of sodium citrate is added, the crosslinking rate of the resin is delayed through the carboxylate group, and the setting time is controlled at 40-50 seconds, which is adapted to the original process of 40 s drying requirement.

[0041] Further, the synthesis process of the imidazolone aldehyde removal agent is optimized and adjusted: stage temperature control: the 60°C dissolution stage is extended to 45 minutes to ensure that the ethanolamine is fully complexed; the 180°C reflux reaction is shortened to 3.5 hours to reduce the damage of high temperature to the structure of the setting retarder; post-treatment optimization: after washing with petroleum ether, 50°C vacuum drying for 8 hours is added to avoid the influence of residual solvent on the resin compatibility.

[0042] Thus, the solubility of the improved imidazolone aldehyde removal agent can be increased by more than 30%, the precipitation rate is less than 0.1%, and the resin setting time is extended by 10%-15% to match the production line drying parameters; therefore, the technical solution of the present application of an environmentally friendly low formaldehyde furniture plate is optimized through molecular design and process cooperation, and both production efficiency and environmental performance are considered.

[0043] Further, in order to improve the solubility, reaction efficiency and environmental performance, the present application of an environmentally friendly low formaldehyde furniture plate proposes several examples of synergistic aldehyde removal agent groups, as follows: Firstly, the components of each part of the synergistic aldehyde removal main agent are defined as follows: diamine compound, 10 parts, urea, 8 parts, deionized water, 5.6 parts, ethanolamine, 0.5 parts, and sodium citrate, 0.3 parts.

[0044] Example 1 of the synergistic aldehyde removal agent group: composite amino acid synergistic formula, the components are as follows in mass parts: Synergistic aldehyde removal main agent: 3-4 parts, 3.5 parts in the comparative test; L-arginine (synergist): 0.5-1 part, 0.75 parts in the comparative test; Magnesium chloride (stabilizer): 0.3 parts; Amino-terminated hyperbranched polyamide (dispersant): 0.5 parts; Deionized water (solvent): the balance.

[0045] The technical effect of this example is that the amino group of the amino acid and the imidazolone synergistically capture formaldehyde to form a stable hydroxymethyl derivative, and the 24-hour aldehyde removal rate is increased to 92%.

[0046] Example 2 of the synergistic aldehyde removal agent group: nano-silver-loaded composite system formulation, in parts by mass, the components are as follows: Imidazolone powder: 10 parts (main reaction component); Nano-silver-loaded titanium dioxide: 0.2 parts (catalytic component); Adipic acid dihydrazide: 1 g (crosslinking agent); Fatty alcohol polyoxyethylene ether: 0.1 g (surfactant).

[0047] The technical effect of this example is that nano-silver enhances the formaldehyde oxidation efficiency and simultaneously inhibits the growth of microorganisms, which is suitable for high-humidity environments.

[0048] Example 3 of the synergistic aldehyde removal agent group: low-temperature curing industrial formulation, in parts by mass, the components are as follows: Ethylene urea (2-imidazolidone): 8 parts; Sodium citrate: 0.5 parts (retarder regulator); Sodium lauryl polyoxyethylene ether sulfate: 2% (emulsifier).

[0049] The technical effect of this example is that it is suitable for melamine resin production lines, the setting time is extended by 15% and there is no precipitation.

[0050] Example 4 of the synergistic aldehyde removal agent group: environmentally friendly formulation, in parts by mass, the components are as follows: Imidazolidone aqueous solution (20%): 25 ml; Acetylacetone: 2 ml (color developing stabilizer); Ethanolamine: 5% (solubilizer); The technical effect of this example is that harmless Mannich base is generated through the Mannich reaction, which is suitable for secondary spraying on the surface of impregnated paper after furniture board preparation or mixing in the secondary impregnation.

[0051] Specifically, the original formula, i.e., diamine compound, 10 g, urea, 8 g and deionized water, 5.6 mL, is taken as a comparative experimental group, and the above-mentioned synergistic aldehyde removal agent group examples 1-4 are experimental groups. The solubility of the five groups of formulations in the resin and the difference in the setting time of the resin are compared as follows: The experimental method is based on: solubility test: according to the melamine-formaldehyde resin solubility standard, the precipitation rate is determined by dynamic light scattering method, and the insoluble mass is quantified by centrifugal separation (3000 rpm / 10 min). The setting time is determined: the change of resin viscosity is monitored by using a rotary rheometer, and the storage modulus (G') reaches 10 4 Pa·s is the setting end point.

[0052] Table 2: improvement effect of the synergistic aldehyde removal agent group

[0053] From the data in Table 2, it can be seen that the precipitation rate of example 3 is the lowest and the setting time is controllable, which is most suitable for industrial production; the solubility of example 4 is optimal but needs to be balanced with volatility; example 2 can realize antibiosis and aldehyde removal at the same time, but the cost is higher. However, the examples 1-4 of the synergistic aldehyde removal agent group have obvious improvements in solubility, reaction efficiency and environmental performance.

[0054] In summary, the present application is a kind of environmentally friendly low formaldehyde furniture plate, which comprises: a blank 1 and a dipped paper 2;Each side of the blank 1 is covered with the dipped paper 2;The components of the dipped paper 2 include: decorative base paper, dipped group and synergistic aldehyde removal agent group;The decorative base paper is a conventional decorative paper for furniture plate with patterns;The dipped group is urea-formaldehyde resin;The components of the synergistic aldehyde removal agent group include: diamine compound, urea, deionized water, ethanolamine and sodium citrate. The synergistic aldehyde removal agent group in the dipped paper covering the periphery of the blank contains-NH2 / -NH in its components;The-NH2 / -NH is a functional group that can effectively adsorb formaldehyde pollutants;Moreover, to reduce the release of formaldehyde, the following techniques can be used for optimization: 1. Adjust the raw material ratio, reduce the formaldehyde / urea molar ratio, the traditional process is formaldehyde excess, which can reduce the source of free formaldehyde;2. Add modifier, mix melamine to form "melamine modified urea-formaldehyde resin", thereby improving water resistance and bonding strength‌;Add formaldehyde capture agent, such as urea and resorcinol, to neutralize free formaldehyde‌;3. Process innovation, for example, the pH value can be controlled to neutral, such as 7-7.5, and adhesives such as glue treasure can be introduced to reduce the content of free aldehyde. Therefore, the present application solves the technical problem of how to improve the environmental performance of furniture plate.

[0055] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, as long as the combination of the technical features does not exist in contradiction, it shall be considered within the scope of the present disclosure.

[0056] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it shall not be understood as a limitation on the patent scope of the present application. It shall be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these shall be within the protection scope of the present application. Therefore, the protection scope of the present application patent shall be subject to the appended claims.

Claims

1. An environmentally friendly low formaldehyde furniture plate, characterized in that, It includes: The plain board and the impregnated paper; Each side of the plain board is covered with the impregnated paper; The components of the impregnated paper include: decorative base paper, impregnated group and synergistic aldehyde removal agent group; the decorative base paper is a conventional decorative paper for furniture board with printed patterns; the impregnated group is urea-formaldehyde resin; the components of the synergistic aldehyde removal agent group include: diamine compound, urea, deionized water, ethanolamine and sodium citrate.

2. The environmentally friendly low-formaldehyde furniture plate according to claim 1, characterized in that: The urea-formaldehyde resin used in the impregnated group is modified urea-formaldehyde resin, and the components of the modified urea-formaldehyde resin are: 37% formaldehyde solution, 420 parts; urea, 222 parts; melamine, 8% of the total amount of urea; polyvinyl alcohol, 1.5 parts; oxidized starch, 5 parts.

3. The environmentally friendly low-formaldehyde furniture plate according to claim 1, characterized in that: The urea-formaldehyde resin used in the impregnated group is modified urea-formaldehyde resin, and the components of the modified urea-formaldehyde resin are: 37% formaldehyde solution, 350 parts; urea, 216 parts; melamine, 5% of the total amount of urea; resorcinol, 2 parts; lignin, 10 parts.

4. The environmentally friendly low-formaldehyde furniture plate according to claim 1, characterized in that: The urea-formaldehyde resin used in the impregnated group is modified urea-formaldehyde resin, and the components of the modified urea-formaldehyde resin are: 37% formaldehyde solution, 400 parts; urea, 211 parts; Melamine, 6 parts; ammonium chloride, 1.5 parts; activated carbon, 0.5 parts.

5. The environmentally friendly low-formaldehyde furniture plate according to claim 1, characterized in that: The components of the synergistic aldehyde removal agent group are: 3-4 parts of synergistic aldehyde removal main agent; L-arginine, 0.5-1 part; magnesium chloride, 0.3 part; amino-terminated hyperbranched polyamide, 0.5 part; wherein the components of each part of the synergistic aldehyde removal main agent are: diamine compound, 10 parts, urea, 8 parts, deionized water, 5.6 parts, ethanolamine, 0.5 parts and sodium citrate, 0.3 parts.

6. The environmentally friendly low-formaldehyde furniture plate according to claim 1, characterized in that: The components of the synergistic aldehyde removal agent group are: 10 parts of imidazolone powder; Silver-loaded nano-titanium dioxide, 0.2 parts; adipic acid dihydrazide, 1g; fatty alcohol polyoxyethylene ether, 0.1g.

7. The environmentally friendly low-formaldehyde furniture plate according to claim 1, characterized in that: The components of the synergistic aldehyde removal agent group are: 8 parts of ethylene urea; sodium citrate, 0.5 parts; sodium lauryl polyoxyethylene ether sulfate, 2 parts.

8. The environmentally friendly low-formaldehyde furniture plate according to claim 1, characterized in that: The components of the synergistic aldehyde removal agent group are: 25ml of 20% imidazolidone aqueous solution; 2ml of acetylacetone; 5% ethanolamine.

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