Artificial board deodorant and deodorization method thereof

Abstract

The invention discloses an artificial board deodorant and a deodorization method thereof, and belongs to the technical field of artificial boards, and the artificial board deodorant comprises the following components: an anhydride compound, an amine compound and water. According to the method, the crushed or sliced wood is dried until the water content is 5-6%, then heat preservation is conducted for 5-10 min at the temperature of 180-200 DEG C, after cooling, an anhydride compound solution is sprayed, standing is conducted, the anhydride compound can react with formaldehyde generated in the drying and heat preservation process to generate salt free of peculiar smell, and therefore the deodorization effect is achieved. After the anhydride compound is added and stands to remove formaldehyde, the amine compound is further added and mixed, and the amine compound can react with the residual anhydride compound to remove the anhydride compound, so that the problem of sour odor caused by the anhydride compound is solved. According to the deodorant and the deodorization method, formaldehyde peculiar smell and the like possibly existing in wood can be removed before the hot-pressing process, and the situation that formaldehyde is generated in the hot-pressing process of the wood can be effectively avoided.

Description

Technical Field

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

[0002] The issue of formaldehyde emission from artificial boards has always attracted much attention during the manufacturing and use process. With the improvement of the environmental protection level of artificial boards, the newly revised national standard GB / T 39600-2021 "Classification of Formaldehyde Emission from Artificial Boards and Their Products" stipulates that E NF The formaldehyde emission requirement for grade artificial boards is ≤0.025mg / m 3 Therefore, without using any formaldehyde-containing adhesives, formaldehyde from wood is an important factor affecting the formaldehyde emission of formaldehyde-free artificial boards.

[0003] During the processing of particleboard and fiberboard, even without the addition of urea-formaldehyde resin, the polysaccharide molecules in the wood will undergo thermal degradation to produce formaldehyde during hot pressing. This is because the wood used in the production of artificial boards is mainly composed of cellulose, hemicellulose and lignin, which generally account for more than 90% of the total amount of wood; and the small amount of chemical components in the wood are mainly free low-molecular compounds, called extracts, mainly including fatty acids, terpenes, flavonoids, lignans, nitrogen-containing compounds, water-soluble carbohydrates and inorganic salts. Relevant studies have pointed out that extracts are the main source of formaldehyde in wood, and the three major elements are potential sources of formaldehyde in wood, so wood will release low levels of formaldehyde. Compared with the formaldehyde released by traditional artificial board adhesives, the formaldehyde content released by wood hot pressing is very low, but this will still affect the smell of artificial boards and to a certain extent, it will also affect people's health. Therefore, it is particularly necessary to study how to remove the formaldehyde released by wood during hot pressing. Summary of the invention

[0004] The invention overcomes the technical problem in the prior art that wood releases formaldehyde in a hot pressing process of an artificial board, and provides an artificial board deodorant and a deodorizing method thereof.

[0005] To solve the above problems, the present invention adopts the following technical solutions:

[0006] A deodorant for artificial boards, comprising the following components:

[0007] Component A: acid anhydride compound;

[0008] Component B: amine compound and water;

[0009] Wherein, the mass ratio of the anhydride compound to the amine compound is 1:1-3.

[0010] Furthermore, the organic anhydride is one or both of maleic anhydride and phthalic anhydride.

[0011] Furthermore, the amine compound is one or more of urea, dimethylethanolamine and triethanolamine.

[0012] Another object of the present invention is to protect a method for deodorizing a wood-based panel using the above-mentioned deodorant, wherein the wood is dried to 5-6% and then heated to 180-200°C for 1-2 hours, cooled to room temperature and then sprayed or soaked in an aqueous solution of anhydride compounds for 1-3 hours, drained to remove moisture, and then sprayed or soaked in an aqueous solution of amine compounds for 1-2 hours; taken out and dried for later use.

[0013] Furthermore, the mass concentration of the amine compound solution is 15-20%.

[0014] Furthermore, the mass concentration of the acid anhydride compound solution is 5-10%.

[0015] The present invention is applicable to panels such as particleboard and particleboard that need to be prepared through a hot pressing process.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention dries the crushed or sliced ​​wood to a moisture content of 5-6% and then heats it at 180-200°C for 5-10 minutes, and then sprays an anhydride compound solution and leaves it to stand after cooling. The anhydride compound can react with the formaldehyde generated during the drying and heat preservation process to generate salts without odor, thereby achieving a deodorizing effect. However, in the actual reaction process, due to the sour taste of the anhydride compound, excessive addition of the anhydride compound can easily lead to an excess of the anhydride compound, the wood has an sour taste and odor, resulting in a serious odor in the prepared finished board. If the anhydride compound is not added enough, the formaldehyde is not removed enough. For this reason, after the anhydride compound is added and left to stand to remove the formaldehyde, the amine compound is added to react continuously. The amine compound can react with the remaining anhydride compound, and the anhydride compound can be reacted to remove the anhydride compound, thereby solving the sour taste and odor problem caused by the anhydride compound. The deodorant and deodorizing method of the present invention can remove the formaldehyde odor and the like that may exist in the wood itself before the hot pressing process, and can effectively prevent the wood from generating formaldehyde during the hot pressing process. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with examples and tests.

[0019] Example 1

[0020] A deodorant for artificial boards comprises the following components: maleic anhydride, urea and water, wherein the mass ratio of maleic anhydride to urea is 1:2.

[0021] The method of deodorizing by using the above-mentioned artificial board deodorant is as follows: crush the wood into particles or slices, dry to 6%, heat to 200℃ and keep warm for 2h, cool to room temperature, spray or soak (spray for particles, soak for slices) maleic anhydride aqueous solution and let stand for 3h, drain and remove water, spray or soak (spray for particles, soak for slices) urea solution and let stand for 2h; take out and dry for use. The mass concentration of the urea solution is 20%. The mass concentration of the maleic anhydride solution is 10%.

[0022] Example 2

[0023] A deodorant for artificial boards comprises the following components: phthalic anhydride, dimethylethanolamine and water; wherein the mass ratio of phthalic anhydride to dimethylethanolamine is 1:3.

[0024] The method of deodorizing by using the above-mentioned artificial board deodorant is as follows: crush the wood into particles or slices, dry to 5%, heat to 180°C and keep warm for 1 hour, cool to room temperature and spray or soak (spray for particles, soak for slices) phthalic anhydride aqueous solution for 1 hour, drain and remove water, spray or soak (spray for particles, soak for slices) dimethylethanolamine aqueous solution for 1 hour; take out and dry for standby use. The mass concentration of the dimethylethanolamine solution is 15%. The mass concentration of the phthalic anhydride solution is 5%.

[0025] Example 3

[0026] A deodorant for artificial boards comprises the following components: maleic anhydride, triethanolamine and water, wherein the mass ratio of maleic anhydride to triethanolamine is 1:1.

[0027] The method of deodorizing by using the above-mentioned artificial board deodorant is as follows: crush the wood into particles or slices, dry to 5%, heat to 190°C and keep warm for 2 hours, cool to room temperature, spray or soak (spray for particles, soak for slices) maleic anhydride aqueous solution and let stand for 2 hours, drain and remove water, spray or soak (spray for particles, soak for slices) triethanolamine aqueous solution and let stand for 1 hour; take out and dry for use. The mass concentration of the triethanolamine solution is 18%. The mass concentration of the maleic anhydride solution is 8%.

[0028] In order to verify the technical effect of the present invention, the following control group was set up:

[0029] Control group 1: The blank control group is to grind the wood into particles or slices, dry it to 5%, heat it to 200°C, keep it for 2 hours, and then cool it for use.

[0030] Control group 2: The wood was crushed into particles or slices, dried to 5%, heated to 200°C for 2 hours, cooled to room temperature, sprayed or soaked (spraying for particles, soaking for slices) with maleic anhydride aqueous solution, and then left to stand for 3 hours, taken out and dried for use. The mass concentration of the maleic anhydride solution was 10%.

[0031] Control group 3: The wood was crushed into particles or slices, dried to 5%, heated to 200°C for 2 hours, cooled to room temperature, sprayed or soaked (spraying for particles, soaking for slices) with urea aqueous solution for 3 hours, and then taken out and dried for use. The mass concentration of the urea aqueous solution is 15%.

[0032] Select local peeled Melia azedarach wood from Guangxi, and after treating the wood according to the method of Examples 1 to 3, the formaldehyde emission of the wood is determined by the perforation method in GB / T 17656-2022 "Test Methods for Physical and Chemical Properties of Artificial Boards and Veneer Artificial Boards". Three parallel tests are conducted on each type of wood, and the average value is taken. The results are shown in Table 1. Then, the wood obtained from Examples 1 to 3 and Control Groups 1 to 3 is used to prepare a double-layer sandwich board, that is, the board structure is outer layer-core material-outer layer, particle wood is used as the core layer raw material, and sheet wood is used as the surface layer. The hot pressing board process is as follows: design thickness 16.68mm, design density 650kg / m3, size 350mm*350mm, surface and core layer wood chips ratio 40:60, hot pressing plate temperature 195℃, hot pressing time 270s, hot pressing pressure (MAX) 6MPa, surface layer M-1 formaldehyde-free adhesive dosage is 8% of the absolute dry wood chips mass, core layer is 6.5%, core layer curing agent dosage 5kg / m3 3 The odor of the finished products was graded and evaluated in accordance with LY / T 3236-2020 "Odor classification and evaluation methods for wood-based panels and their products". The results are shown in Table 2 below.

[0033] Table 1

[0034] Experimental Group Average formaldehyde emission / (mg·100g-1) Example 1 0.0235 Example 2 0.0132 Example 3 0.0231 Control group 1 0.3154 Control group 2 0.0251 Control group 3 0.2614

[0035] Table 2

[0036]

[0037]

[0038] As shown in Table 1, the addition of anhydride compounds in Examples 1 to 3 and Control Group 2 can greatly reduce the formaldehyde content during the hot pressing process. As shown in Table 2, Control Group 2 has the highest odor level, which is significantly higher than Examples 1 to 3 and also higher than Control Group 1, indicating that the smell of the board prepared without subsequent treatment after the addition of anhydride compounds is not good, so amine compounds should be added after the addition of anhydride treatment to remove the anhydride compounds. The two experiments can show that the use of anhydride compounds and amine compounds in combination can greatly reduce the formaldehyde generated by wood during the hot pressing process, and the smell of the prepared board is excellent.

[0039] The above description is a detailed description of the preferred feasible embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modified changes completed under the technical spirit suggested by the present invention should fall within the patent scope covered by the present invention.

Claims

1. A deodorant for artificial boards, characterized in that: It includes the following components: Component A: acid anhydride compound; Component B: amine compound and water; Wherein, the mass ratio of the acid anhydride compound to the amine compound is 1:1-3.

2. A deodorant for artificial boards according to claim 1, characterized in that: The organic anhydride is one or both of maleic anhydride and phthalic anhydride.

3. The deodorant for artificial boards according to claim 1, characterized in that: The amine compound is one or more of urea, dimethylethanolamine and triethanolamine.

4. A method for deodorizing a wood-based panel using the deodorant according to any one of claims 1 to 3, characterized in that: After drying the wood to 5-6%, heat it to 180-200℃ and keep it warm for 1-2h. After cooling to room temperature, spray or soak it in an aqueous solution of anhydride compounds for 1-3h. After draining to remove moisture, spray or soak it in an aqueous solution of amine compounds for 1-2h. Take it out and dry it for later use.

5. The deodorizing method according to claim 4, characterized in that: The mass concentration of the amine compound solution is 15-20%.

6. The deodorizing method according to claim 4, characterized in that: The mass concentration of the acid anhydride compound solution is 5-10%.

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