Modified ammoniacal quaternary ammonium copper and anticorrosive oriented strand board, preparation method and application

Abstract

The application belongs to the technical field of preservative materials and functional artificial board, and relates to modified ammonia-dissolved quaternary ammonium copper, a preservative oriented shaving board, a preparation method and application. In the prior art, when ammonia-dissolved quaternary ammonium copper is used for wood preservation, the preservative effect of ammonia-dissolved quaternary ammonium copper is enhanced with the increase of the amount of adhesive, which leads to a large amount of adhesive and a non-environmental protection technical problem. The application provides a preparation method of modified ammonia-dissolved quaternary ammonium copper, which comprises the following steps: uniformly mixing a modifier and ammonia-dissolved quaternary ammonium copper with a mass ratio of (1-2) to 10; evaporating and concentrating to a mass concentration of 30-40%; the modifier is a poly(styrene-butyl acrylate-acrylic acid) / silicon dioxide nano composite emulsion, and the operation is simple and convenient. The prepared modified ammonia-dissolved quaternary ammonium copper can enhance the preservative performance with a smaller amount of adhesive. The application further provides a preparation method of a preservative oriented shaving board, which can adapt to the existing production process and technology, and the prepared preservative oriented shaving board has enhanced preservative capacity.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of preservative materials and functional wood-based panels, and in particular relates to a modified ammonia-dissolved quaternary ammonium copper and a preservative oriented strand board, a preparation method and an application. BACKGROUND

[0002] Oriented strand board has excellent mechanical properties and is one of the structural wood-based panel products. With the development of wood building structure industry, oriented strand board is increasingly used as a covering panel for roof panels, floor panels and wall panels of wood structure buildings. The oriented strand board without preservative treatment is easily eroded by mold and decay fungi, and it decays in a similar way to solid wood under certain conditions. Early decay will destroy most of the mechanical strength and deformation resistance of the building structure. Therefore, it is of great significance to preservative treatment of oriented strand board to improve its preservative performance for the safe use of buildings.

[0003] The commonly used preservatives on the market at present are mainly two water-soluble preservatives, copper-chromium-arsenic and ammonia-dissolved quaternary ammonium copper. Among them, copper-chromium-arsenic preservative is more commonly used, and chromium (Cr) in it has good fixation, but has great side effects on the environment. In comparison, ammonia-dissolved quaternary ammonium copper preservative not only has good preservative effect, but also is harmless to the environment, so it is widely recognized at home and abroad. Chinese patent application publication No. CN103283516A, application date May 30, 2013, entitled "Live tree poplar preservative treatment method", discloses the following process steps: 1) injection position of preservative solution in the trunk, 2) preservative solution concentration and injection amount, 3) determination of initial time of live tree poplar preservative injection, 4) determination of poplar harvesting time, 5) test of uniformity of movement and penetration of the agent in the trunk, 6) test of poplar preservative performance. The scheme uses ammonia-dissolved quaternary ammonium copper to preservative treatment of live tree poplar, and makes ammonia-dissolved quaternary ammonium copper uniformly penetrate into each part of the poplar by means of negative pressure generated by transpiration of the tree, but the scheme needs a long time to ensure uniform distribution of the preservative in the trunk, which affects the treatment efficiency; the penetration of the preservative may lead to uneven distribution, especially in different parts of the tree. Since the production of oriented strand board usually involves directional laying and hot pressing of shavings, it will affect the uniform penetration of the preservative, and the hot pressing process may affect the chemical stability of ammonia-dissolved quaternary ammonium copper, reducing its preservative effect.

[0004] Compared with the pressure impregnation of solid trees / timber, the "separation-recombination" of wood units in oriented strand board gives it more methods of preservative treatment. As Jin Juwan et al. Copper-based preservative on the performance of bamboo oriented strand board. Wood Industry [J]. 2009. 23(5): 8-11. Wei Wan-shu et al. Four preservatives treated bamboo oriented strand board of corrosion resistance. Wood Industry [J]. 2011. 25(2): 8-10. respectively disclosed the bamboo oriented strand board treated by ammonia-dissolved quaternary ammonium copper, since oriented strand board will use adhesive as raw material in the production process, the above prior art discloses that the type of adhesive may affect the preservative performance. Although the ammonia-dissolved quaternary ammonium copper is used for living tree poplar or bamboo oriented strand board in the prior art, the preservative performance is improved, but for building material oriented strand board, when stronger preservative performance is needed, it should also be more environmentally friendly and safe to adapt to the wood products that people tend to choose more environmentally friendly and safer glue and treatment agent. SUMMARY

[0005] 1. Problem to be solved

[0006] In the prior art, when ammonia-dissolved quaternary ammonium copper is used for wood preservation, the preservative effect of ammonia-dissolved quaternary ammonium copper is enhanced with the increase of the amount of adhesive, resulting in a large amount of adhesive, which is not environmentally friendly. The present application provides a preparation method of modified ammonia-dissolved quaternary ammonium copper, which can enhance the preservative performance with less amount of adhesive. The present application also provides a preservative oriented strand board and a preparation method thereof, which has simple preparation process, enhanced preservative capacity and can adapt to the production process and technology of existing oriented strand board.

[0007] 2. Technical solution

[0008] In order to achieve the above-mentioned purpose, the technical solution provided is:

[0009] The preparation method of modified ammonia-dissolved quaternary ammonium copper comprises the following steps:

[0010] S1. Mix poly(styrene-butyl acrylate-acrylic acid) / silica nanocomposite emulsion and ammonia-dissolved quaternary ammonium copper with a mass ratio of (1-2) : 10;

[0011] S2. Evaporate and concentrate to a mass concentration of 30-40%.

[0012] The modified ammonia-dissolved quaternary ammonium copper is prepared according to the method.

[0013] The application of modified ammonia-dissolved quaternary ammonium copper is applied to the preparation of preservative materials.

[0014] The preparation method of preservative oriented strand board uses modified ammonia-dissolved quaternary ammonium copper and comprises the following steps:

[0015] Flakes: preparing surface layer raw material and core layer raw material;

[0016] Preparation of surface layer or core layer: adding phenolic resin adhesive and the modified ammoniacal quaternary ammonium copper in the surface layer raw material or core layer raw material, stirring uniformly to obtain the surface layer or core layer, the solid content of the phenolic resin adhesive is 43-50%; the solid mass of the phenolic resin adhesive and the modified ammoniacal quaternary ammonium copper respectively accounts for 6-12%, 2-6% of the dry mass of the surface layer or core layer;

[0017] Preparation of preservative oriented strand board: a plurality of surface layers, core layers, surface layers are sequentially laid according to the three-layer structure; the surface layer is uniformly laid according to the fiber direction and the horizontal direction at 0-90°; the core layer is laid according to the fiber direction and the surface layer fiber direction at 0-90°; hot pressing to obtain the preservative oriented strand board.

[0018] Further, the solid mass of the phenolic resin adhesive and the modified ammoniacal quaternary ammonium copper respectively accounts for 8%, 6% of the dry mass of the surface layer or core layer.

[0019] Further, the number of layers of the surface layer:core layer:surface layer is (2-3):(4-6):(2-3).

[0020] Further, the length of the surface layer raw material is 10-15 cm, the width is 6-10 cm, and the thickness is 0.5-0.6 mm; the length of the core layer raw material is 6-8 cm, the width is 2-3 cm, and the thickness is 0.5-0.6 mm.

[0021] Preferably, the water content of the surface layer raw material and the core layer raw material after drying is 2-4%.

[0022] Further, the temperature of the hot pressing is 180-200°C, the pressure is 2.5-6.0 MPa; the hot pressing factor is 0.75-1.0 min / mm.

[0023] Further, it further comprises the steps of aging, edge cutting and sanding after the hot pressing step.

[0024] Preservative oriented strand board, prepared by the method.

[0025] 3. Beneficial effects

[0026] Compared with the prior art, the technical scheme provided by the present application has the following beneficial effects:

[0027] (1) The preparation method of the modified ammoniacal quaternary ammonium copper of the present application uses a modifier of poly(styrene-butyl acrylate-acrylic acid) / silica nanocomposite emulsion. The modifier and the ammoniacal quaternary ammonium copper are mixed uniformly, and then evaporated and concentrated to obtain the product. The preparation method is simple, convenient to operate and high in efficiency.

[0028] (2) The modified ammoniacal copper quaternary of the present application has higher corrosion prevention effect than the ammoniacal copper quaternary, and can enhance the corrosion prevention performance with less amount of adhesive.

[0029] (3) The application of the modified ammoniacal copper quaternary of the present application is applied to the preparation of corrosion prevention materials, especially the corrosion prevention function treatment of indoor furniture wood / bamboo products and building materials, which endows the wood and bamboo with high efficient corrosion prevention performance and safety performance, and plays a long-term protection role on the wood and bamboo.

[0030] (4) The preparation method of the corrosion prevention oriented strand board of the present application uses the modified ammoniacal copper quaternary as the corrosion prevention agent, has simple preparation process, enhanced corrosion prevention ability, and can adapt to the production process and technology of the existing oriented strand board.

[0031] (5) The corrosion prevention oriented strand board of the present application has high corrosion prevention performance, can achieve strong corrosion resistance grade, is more environmentally friendly and safe, and can meet the requirements of building materials in other mechanical performance parameters. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a preparation process schematic diagram of the corrosion prevention oriented strand board of the present application. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0034] ABBREVIATIONS

[0035] OSB: oriented strand board, oriented strand board

[0036] ACQ: Ammoniacal Copper Quaternary, ammoniacal copper quaternary

[0037] CCA: Chromated Copper Arsenate, copper chromium arsenic

[0038] PF: phenol-formaldehyde resin, phenol-formaldehyde resin

[0039] The preparation method of the corrosion prevention oriented strand board of the present application comprises the following steps:

[0040] S1. Shaving: preparing surface layer raw material and core layer raw material; the surface layer raw material has a length of 10-15 cm, a width of 6-10 cm and a thickness of 0.5-0.6 mm; the core layer raw material has a length of 6-8 cm, a width of 2-3 cm and a thickness of 0.5-0.6 mm; the surface layer raw material and the core layer raw material are sent into a drying machine for drying, and the surface layer raw material and the core layer raw material have a water content of 2-4 wt%.

[0041] S2. Phenolic resin adhesive: the phenolic resin adhesive has a solid content of 43-50%.

[0042] S3. Preparing modified ammoniacal quaternary ammonium copper: mixing a modifier and ammoniacal quaternary ammonium copper uniformly at a mass ratio of (1-2) : 10, and concentrating by a rotary evaporator to a mass concentration of 30-40%; the modifier is poly(styrene-butyl acrylate-acrylic acid) / silica nano composite emulsion.

[0043] S4. Preparing a surface layer: adding phenolic resin adhesive and modified ammoniacal quaternary ammonium copper to the surface layer raw material; while stirring the surface layer raw material, adding the phenolic resin adhesive to the surface layer raw material, and then spraying the modified ammoniacal quaternary ammonium copper onto the surface of the surface layer raw material, and continuing to stir uniformly to obtain the surface layer; the solid mass of the phenolic resin adhesive and the modified ammoniacal quaternary ammonium copper accounts for 6-12% and 2-6%, respectively, of the absolute dry mass of the surface layer.

[0044] S5. Preparing a core layer: adding phenolic resin adhesive and modified ammoniacal quaternary ammonium copper to the core layer raw material; while stirring the core layer raw material, adding the phenolic resin adhesive to the core layer raw material, and then spraying the modified ammoniacal quaternary ammonium copper onto the surface of the core layer raw material, and continuing to stir uniformly to obtain the core layer; the solid mass of the phenolic resin adhesive and the modified ammoniacal quaternary ammonium copper accounts for 6-12% and 2-6%, respectively, of the absolute dry mass of the core layer.

[0045] S6. Directional paving: paving in the order of surface layer, core layer and surface layer in a three-layer structure; the surface layer is paved uniformly at an angle of 0-90° between the fiber direction and the horizontal direction; the core layer is paved at an angle of 0-90° between the fiber direction and the fiber direction of the surface layer; the mass ratio of the surface layer : core layer : surface layer is (2-3) : (4-6) : (2-3).

[0046] S7. Pre-pressing and hot-pressing to obtain a corrosion-resistant directional shaving board; the hot-pressing temperature is 180-200°C, the pressure is 2.5-6.0 MPa, and the hot-pressing factor is 0.75-1 min / mm. After pre-pressing and hot-pressing, aging, edge cutting and sanding are performed.

[0047] In the following examples, the poly(styrene-butyl acrylate-acrylic acid) / silica nanocomposite emulsion is compounded from a poly(styrene-butyl acrylate-acrylic acid) emulsion with a solid content of 30-50% and a silica nanocomposite emulsion with a solid content of 50-65%, wherein the solid content of poly(styrene-butyl acrylate-acrylic acid) and silica nano is (10-20): 15.

[0048] Example 1 (phenolic resin 8 wt%; modified ammoniacal quaternary ammonium copper 6 wt%)

[0049] The modified ammoniacal quaternary ammonium copper and the preservative oriented strand board of the present example, the preparation method and the application, the specific steps are as follows:

[0050] S1. Fluffing: preparing surface layer raw material and core layer raw material; the length of the surface layer raw material is 13 cm, the width is 8 cm, and the thickness is 0.55 mm; the length of the core layer raw material is 7 cm, the width is 2.5 cm, and the thickness is 0.55 mm. The surface layer raw material and the core layer raw material are sent into a drying machine for drying until the moisture content is 3 wt%.

[0051] S2. Preparing phenolic resin adhesive: the solid content of the phenolic resin adhesive is 47%;

[0052] S3. Preparing modified ammoniacal quaternary ammonium copper: the poly(styrene-butyl acrylate-acrylic acid) / silica nanocomposite emulsion modifier and the ammoniacal quaternary ammonium copper are uniformly mixed according to a mass ratio of 1.5:10, and are concentrated by a rotary evaporator to a mass concentration of 35%. The poly(styrene-butyl acrylate-acrylic acid) / silica nanocomposite emulsion is compounded from a poly(styrene-butyl acrylate-acrylic acid) emulsion with a solid content of 40% and a silica nanocomposite emulsion with a solid content of 58%, wherein the solid content of poly(styrene-butyl acrylate-acrylic acid) and silica nano is 1:1.

[0053] S4. Preparing surface layer: adding phenolic resin adhesive and modified ammoniacal quaternary ammonium copper to the surface layer raw material; while stirring the surface layer raw material, the phenolic resin adhesive is added to the surface layer raw material, and then the modified ammoniacal quaternary ammonium copper is sprayed onto the surface of the surface layer raw material, and the stirring is continued until uniformity is achieved, to obtain the surface layer; the solid mass of the phenolic resin adhesive and the modified ammoniacal quaternary ammonium copper accounts for 8% and 6% of the absolute dry mass of the surface layer, respectively.

[0054] S5. Preparing core layer: adding phenolic resin adhesive and modified ammoniacal quaternary ammonium copper to the core layer raw material; while stirring the core layer raw material, the phenolic resin adhesive is added to the core layer raw material, and then the modified ammoniacal quaternary ammonium copper is sprayed onto the surface of the core layer raw material, and the stirring is continued until uniformity is achieved, to obtain the core layer; the solid mass of the phenolic resin adhesive and the modified ammoniacal quaternary ammonium copper accounts for 8% and 6% of the absolute dry mass of the core layer, respectively.

[0055] S6. Directional paving: paving in the order of three layers of surface layer, core layer, surface layer; the surface layer is paved uniformly with the fiber direction at 60° to the horizontal direction; the core layer is paved with the fiber direction at 90° to the surface layer fiber direction; the mass ratio of surface layer:core layer:surface layer is 2:5:2;

[0056] S7. Pre-pressing and hot-pressing to obtain the corrosion-resistant directional shaving board. The hot-pressing temperature is 190℃, the pressure is 4.5MPa, and the hot-pressing factor is 0.85min / mm. After pre-pressing and hot-pressing, aging, edge cutting and sanding are performed.

[0057] The corrosion-resistant directional shaving board prepared in the embodiment has the performance shown in Table 1.

[0058] Example 2 (phenolic resin 6wt%, modified ammoniacal quaternary ammonium copper 2wt%)

[0059] The modified ammoniacal quaternary ammonium copper, the corrosion-resistant directional shaving board, the preparation method and the application of the embodiment have the following specific steps:

[0060] S1. Shaving: preparing surface layer raw material and core layer raw material; the surface layer raw material has a length of 10cm, a width of 6cm and a thickness of 0.5mm; the core layer raw material has a length of 6cm, a width of 2cm and a thickness of 0.5mm. The surface layer raw material and the core layer raw material are sent into a drying machine for drying until the water content is 2wt%.

[0061] S2. Preparing phenolic resin adhesive: the solid content of the phenolic resin adhesive is 43%;

[0062] S3. Preparing modified ammoniacal quaternary ammonium copper: the poly(styrene-butyl acrylate-acrylic acid) / silica nano composite emulsion modifier and the ammoniacal quaternary ammonium copper are uniformly mixed at a mass ratio of 1:10, and concentrated by a rotary evaporator to a mass concentration of 33%. The poly(styrene-butyl acrylate-acrylic acid) / silica nano composite emulsion is composed of poly(styrene-butyl acrylate-acrylic acid) emulsion with a solid content of 30% and silica nano composite emulsion with a solid content of 50%, and the solid content of poly(styrene-butyl acrylate-acrylic acid) and silica nano is 4:3.

[0063] S4. Preparing surface layer: adding phenolic resin adhesive and modified ammoniacal quaternary ammonium copper to the surface layer raw material; while stirring the surface layer raw material, adding the phenolic resin adhesive to the surface layer raw material, then spraying the modified ammoniacal quaternary ammonium copper onto the surface of the surface layer raw material, and continuing to stir uniformly to obtain the surface layer; the solid mass of the phenolic resin adhesive and the modified ammoniacal quaternary ammonium copper accounts for 6% and 2% of the absolute dry mass of the surface layer respectively;

[0064] S5. Preparing core layer: adding phenolic resin adhesive and modified ammoniacal quaternary ammonium copper into core layer raw material; adding phenolic resin adhesive into core layer raw material while stirring core layer raw material, then spraying modified ammoniacal quaternary ammonium copper onto surface of core layer raw material, continuing to stir uniformly to obtain core layer; solid mass of phenolic resin adhesive and modified ammoniacal quaternary ammonium copper accounts for 6% and 2% of absolute dry mass of core layer respectively;

[0065] S6. Directional paving: paving in order of surface layer, core layer and surface layer; paving surface layer uniformly with fiber direction at 60° to horizontal direction; paving core layer with fiber direction at 90° to fiber direction of surface layer; mass ratio of surface layer: core layer: surface layer is 2:4:3;

[0066] S7. Pre-pressing and hot-pressing to obtain corrosion-resistant directional particle board. Hot-pressing temperature is 180℃, pressure is 2.5MPa, and hot-pressing factor is 0.75min / mm. After pre-pressing and hot-pressing, aging, edge cutting and sanding are performed.

[0067] The corrosion-resistant directional particle board prepared in the embodiment has the performance as shown in Table 1.

[0068] Example 3 (phenolic resin 12wt%, modified ammoniacal quaternary ammonium copper 4wt%)

[0069] The modified ammoniacal quaternary ammonium copper, the corrosion-resistant directional particle board, the preparation method and the application of the embodiment have the following specific steps:

[0070] S1. Flaking: preparing surface layer raw material and core layer raw material; length of surface layer raw material is 15cm, width is 10cm, and thickness is 0.6mm; length of core layer raw material is 8cm, width is 3cm, and thickness is 0.6mm. Surface layer raw material and core layer raw material are sent into a drying machine for drying until water content is 4wt%.

[0071] S2. Preparing phenolic resin adhesive: solid content of phenolic resin adhesive is 50%;

[0072] S3. Preparing modified ammoniacal quaternary ammonium copper: mixing poly(styrene-butyl acrylate-acrylic acid) / silica nano composite emulsion modifier and ammoniacal quaternary ammonium copper uniformly according to mass ratio of 1:5, and concentrating by rotary evaporator to mass concentration of 40%. The poly(styrene-butyl acrylate-acrylic acid) / silica nano composite emulsion is compounded by poly(styrene-butyl acrylate-acrylic acid) emulsion with solid content of 50% and silica nano composite emulsion with solid content of 65%, and solid content of poly(styrene-butyl acrylate-acrylic acid) and silica nano is 2:3.

[0073] S4. Preparing the surface layer: adding phenolic resin adhesive and modified ammoniacal quaternary ammonium copper into the surface layer raw material; adding the phenolic resin adhesive into the surface layer raw material while stirring the surface layer raw material, then spraying the modified ammoniacal quaternary ammonium copper onto the surface of the surface layer raw material, and continuing to stir until uniform, to obtain the surface layer; the solid mass of the phenolic resin adhesive and the modified ammoniacal quaternary ammonium copper accounts for 12% and 4% of the absolute dry mass of the surface layer, respectively;

[0074] S5. Preparing the core layer: adding phenolic resin adhesive and modified ammoniacal quaternary ammonium copper into the core layer raw material; adding the phenolic resin adhesive into the core layer raw material while stirring the core layer raw material, then spraying the modified ammoniacal quaternary ammonium copper onto the surface of the core layer raw material, and continuing to stir until uniform, to obtain the core layer; the solid mass of the phenolic resin adhesive and the modified ammoniacal quaternary ammonium copper accounts for 12% and 4% of the absolute dry mass of the core layer, respectively;

[0075] S6. Directional paving: paving in the order of surface layer, core layer, and surface layer; the surface layer is paved uniformly at an angle of 60° between the fiber direction and the horizontal direction; the core layer is paved at an angle of 90° between the fiber direction and the fiber direction of the surface layer; the mass ratio of the surface layer:core layer:surface layer is 3:6:2;

[0076] S7. Pre-pressing and hot-pressing to obtain the corrosion-resistant directional particle board. The hot-pressing temperature is 200°C, the pressure is 6.0 MPa, and the hot-pressing factor is 1.0 min / mm. After pre-pressing and hot-pressing, aging, edge cutting, and sanding are performed.

[0077] The performance of the corrosion-resistant directional particle board prepared in this example is shown in Table 1.

[0078] Comparative Example 1 (phenolic resin 8wt%, ammoniacal quaternary ammonium copper 6wt%)

[0079] This comparative example is basically the same as Example 1, except that unmodified ammoniacal quaternary ammonium copper is used.

[0080] The performance of the corrosion-resistant directional particle board prepared in this comparative example is shown in Table 1.

[0081] Comparative Example 2 (phenolic resin 10wt%, ammoniacal quaternary ammonium copper 6wt%)

[0082] This comparative example is basically the same as Comparative Example 1, except that the mass of the phenolic resin adhesive accounts for the mass of the absolute dry particle.

[0083] The performance of the corrosion-resistant directional particle board prepared in this comparative example is shown in Table 1.

[0084] Comparative Example 3 (phenolic resin 8wt%, ammoniacal quaternary ammonium copper 4wt%)

[0085] This comparative example is basically the same as Comparative Example 1, except that the mass of the phenolic resin adhesive and the ammoniacal quaternary ammonium copper accounts for the mass of the absolute dry particle.

[0086] The preservative oriented strand board prepared in this comparative example has the performance shown in Table 1.

[0087] Comparative Example 4 (phenolic resin 8 wt%, ammonia-soluble quaternary ammonium copper 2 wt%)

[0088] This comparative example is basically the same as Comparative Example 1, except that the phenolic resin adhesive and ammonia-soluble quaternary ammonium copper account for the mass of the absolutely dry strands.

[0089] The preservative oriented strand board prepared in this comparative example has the performance shown in Table 1.

[0090] Comparative Example 5 (phenolic resin 8 wt%, no ammonia-soluble quaternary ammonium copper)

[0091] This comparative example is basically the same as Comparative Example 1, except that no ammonia-soluble quaternary ammonium copper preservative is added.

[0092] The preservative oriented strand board prepared in this comparative example has the performance shown in Table 1.

[0093] Comparative Example 6 (phenolic resin 6 wt%, no ammonia-soluble quaternary ammonium copper)

[0094] This comparative example is basically the same as Comparative Example 1, except that the amount of phenolic resin adhesive added is 6 wt%, and no ammonia-soluble quaternary ammonium copper preservative is added.

[0095] The preservative oriented strand board prepared in this comparative example has the performance shown in Table 1.

[0096] Comparative Example 7 (phenolic resin 8 wt%; ammonia-soluble quaternary ammonium copper and modifier together 6 wt%)

[0097] This comparative example is basically the same as Example 1, except that the ammonia-soluble quaternary ammonium copper is not modified, but is sprayed to the surface of the strands together with the modifier.

[0098] The preservative oriented strand board prepared in this comparative example has the performance shown in Table 1.

[0099] The various parameters of the oriented strand boards prepared in Examples 1-3 and Comparative Examples 1-7 are compared, and are shown in Table 1.

[0100] Table 1 Performance parameters of preservative oriented strand boards

[0101]

[0102] Note: According to the standard GB / T 13942.1-2009, the mass loss is 0-10%, which is a strong corrosion-resistant grade; the mass loss is 11-24%, which is a corrosion-resistant grade.

[0103] As can be seen from Examples 1-3, when the addition amount of the phenolic resin adhesive is 6-12 wt%, and the addition amount of the modified ammoniacal quaternary ammonium copper is 2-6 wt%, the mass loss rate of the oriented strand board is 1.63-6.03%, reaching the strong corrosion-resistant grade, and the mass loss rates of the oriented strand boards of Example 1 and Example 3 are 1.63% and 1.70% respectively, the addition amounts of the phenolic resin adhesive are 8 wt% and 12 wt% respectively, and the technical solution of Example 1 is the preferred solution in terms of cost and environmental safety.

[0104] As can be seen from the Comparative Examples, when the addition amount of the phenolic resin adhesive is the same, increasing the addition amount of the ammoniacal quaternary ammonium copper can reduce the mass loss rate of the oriented strand board. In Comparative Examples 4, 3 and 1, the addition amount of the phenolic resin adhesive is 8 wt%, and the addition amounts of the ammoniacal quaternary ammonium copper are 2 wt%, 4 wt% and 6 wt% respectively, and the final mass loss rates of the oriented strand boards are 7.06 wt%, 4.60 wt% and 2.53 wt% respectively.

[0105] When the ammoniacal quaternary ammonium copper is not added, increasing the addition amount of the phenolic resin adhesive can reduce the mass loss rate of the oriented strand board. In Comparative Examples 6 and 5, the ammoniacal quaternary ammonium copper is not added, and the addition amounts of the phenolic resin adhesive are 6 wt% and 8 wt% respectively, and the mass loss rates of the oriented strand boards are 11.2 wt% and 7.58 wt% respectively.

[0106] As can be seen from the Examples and Comparative Examples, in terms of corrosion resistance, the modified ammoniacal quaternary ammonium copper has better corrosion resistance than the ammoniacal quaternary ammonium copper when the same amount of corrosion inhibitor is added. In Example 1, 6 wt% of the modified ammoniacal quaternary ammonium copper is added, and the mass loss rate of the oriented strand board is 1.63 wt%, and in Comparative Example 1, 6 wt% of the ammoniacal quaternary ammonium copper is added, and the mass loss rate of the oriented strand board is 2.53 wt%. In Comparative Example 7, 6 wt% of the ammoniacal quaternary ammonium copper and the modifier are added successively, and the mass loss rate of the oriented strand board is 1.95%.

[0107] In terms of the addition amount of the adhesive, excellent corrosion resistance can be obtained while reducing the amount of the adhesive. In Example 1, 6 wt% of the modified ammoniacal quaternary ammonium copper and 8 wt% of the phenolic resin adhesive are added, and the mass loss rate of the oriented strand board is 1.63 wt%, and in Comparative Example 2, 6 wt% of the ammoniacal quaternary ammonium copper and 10 wt% of the phenolic resin adhesive are added, and the mass loss rate of the oriented strand board is 1.72 wt%.

[0108] The above described embodiments only express the preferred embodiments of the present application, which are described in more detail and in more specifically, but can not be understood as the limitation of the patent scope of the present application. It should be noted that for the ordinary skilled in the art, several modifications, improvements and substitutions can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A method for the production of a preservative- oriented strand board, characterized by: The method comprises the following steps: Flaking: preparing surface layer raw material and core layer raw material; Preparation of modified ammoniacal quaternary ammonium copper: Mixing poly(styrene-butyl acrylate-acrylic acid) / silica nanocomposite emulsion and ammoniacal quaternary ammonium copper in a mass ratio of (1-2):10; Evaporating and concentrating to a mass concentration of 30-40 %; Preparation of surface layer or core layer: adding phenolic resin adhesive and the modified ammoniacal quaternary ammonium copper to the surface layer raw material or core layer raw material, stirring uniformly to obtain a surface layer or core layer, the solid content of the phenolic resin adhesive being 43-50 %; the solid mass of the phenolic resin adhesive and the modified ammoniacal quaternary ammonium copper accounting for 8 % and 6 %, respectively, of the dry mass of the surface layer or core layer; Preparation of the corrosion-resistant oriented strand board: sequentially laying a plurality of surface layers, core layers, and surface layers in a three-layer structure; the surface layers are laid uniformly at an angle of 0-90° between the fiber direction and the horizontal direction; The core layers are laid at an angle of 0-90° between the fiber direction and the surface layer fiber direction; Hot pressing to obtain the corrosion-resistant oriented strand board.

2. The method of claim 1, wherein the preservative oriented strand board is prepared by: The number of layers of the surface layer:core layer:surface layer is (2-3):(4-6):(2-3).

3. The method of claim 2, wherein the preservative oriented strand board is prepared by: The surface layer raw material has a length of 10-15 cm, a width of 6-10 cm, and a thickness of 0.5-0.6 mm; the core layer raw material has a length of 6-8 cm, a width of 2-3 cm, and a thickness of 0.5-0.6 mm.

4. The method of claim 3, wherein the preservative oriented strand board is prepared by: The hot pressing temperature is 180-200 ℃, the pressure is 2.5-6.0 MPa, and the hot pressing factor is 0.75-1.0 min / mm.

5. The method of producing the preservative oriented strand board according to any one of claims 1 to 4, characterized in that: The method further comprises the steps of aging, edge cutting, and sanding after the hot pressing step.

6. A preservative oriented strand board, characterized by: The method is prepared by using any one of claims 1-5. The method is prepared by using any one of claims 1-5.

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