阅读说明：本技术 一种疏水保温木材改性方法 (Hydrophobic heat-preservation wood modification method ) 是由 陈红 吴智慧 詹先旭 谢序勤 于 2020-06-28 设计创作，主要内容包括：本发明公开的一种疏水保温木材改性方法,包括如下步骤：S1.将木材加工成1-3mm厚的原料单板,将原料单板表面的毛刺和边缘进行砂光,气干后放入烘箱中进行一次干燥,烘至全干,得干燥单板；S2.取粒径为40nm-20μm的二氧化硅气凝胶粉末与乙醇混合,并搅拌均匀,得二氧化硅气凝胶-乙醇浸渍液；S3.将S1干燥单板放入S2二氧化硅气凝胶-乙醇浸渍液中,常温真空浸渍,得浸渍单板,其中,干燥单板与二氧化硅气凝胶-乙醇浸渍液的体积比为1:1-3；S4.将S3浸渍单板放入烘箱中进行二次干燥,烘至恒定重量,得木材-二氧化硅气凝胶复合材料粗品；S5.将S4的木材-二氧化硅气凝胶复合材料粗品再次经步骤S3、S4重复处理3-5次,得木材-二氧化硅气凝胶复合材料,保温性能好。(The invention discloses a hydrophobic heat-preservation wood modification method, which comprises the following steps: s1, processing wood into a raw material single plate with the thickness of 1-3mm, sanding burrs and edges on the surface of the raw material single plate, drying in an oven for one time after air drying, and drying to be completely dry to obtain a dried single plate; s2, mixing silicon dioxide aerogel powder with the particle size of 40nm-20 microns with ethanol, and uniformly stirring to obtain silicon dioxide aerogel-ethanol impregnation liquid; s3, placing the S1 dried veneer into S2 silicon dioxide aerogel-ethanol impregnation liquid, and performing vacuum impregnation at normal temperature to obtain an impregnated veneer, wherein the volume ratio of the dried veneer to the silicon dioxide aerogel-ethanol impregnation liquid is 1: 1-3; s4, placing the impregnated single plate S3 into a drying oven for secondary drying until the weight is constant, and obtaining a crude product of the wood-silicon dioxide aerogel composite material; s5, repeatedly treating the crude wood-silicon dioxide aerogel composite material product of the S4 for 3-5 times through the steps S3 and S4 again to obtain the wood-silicon dioxide aerogel composite material with good heat preservation performance.)

1. A hydrophobic heat preservation wood modification method is characterized by comprising the following steps:

s1, raw material processing: processing wood into a raw material single plate with the thickness of 1-3mm, sanding burrs and edges on the surface of the raw material single plate, drying in an oven for the first time after air drying, and drying till the raw material single plate is completely dried to obtain a dried single plate;

s2 silica aerogel dispersion: mixing silica aerogel powder with the particle size of 40nm-20 μm with ethanol, and uniformly stirring to obtain silica aerogel-ethanol impregnation liquid;

s3, dipping treatment: putting the dried veneer of S1 into the silicon dioxide aerogel-ethanol impregnation liquid of S2, and performing vacuum impregnation at normal temperature to obtain an impregnated veneer, wherein the volume ratio of the dried veneer to the silicon dioxide aerogel-ethanol impregnation liquid is 1: 1-3;

s4, secondary drying: putting the impregnated veneer of S3 into a drying oven for secondary drying until the weight is constant, and obtaining a crude product of the wood-silicon dioxide aerogel composite material;

s5, crude product processing: and (4) repeatedly treating the crude wood-silicon dioxide aerogel composite material obtained in the step S4 for 3-5 times through the steps S3 and S4 again to obtain the wood-silicon dioxide aerogel composite material.

2. The method for modifying hydrophobic insulation wood according to claim 1, wherein the raw material in step S1 has a length of 5cm to 2220cm, a width of 1cm to 1440cm, and a thickness of 1cm to 3 cm.

3. The method for modifying hydrophobic insulation wood according to claim 1, wherein the concentration of the silica aerogel-ethanol impregnation solution in the step S2 is 0.01% -0.1%.

4. The method as claimed in claim 1, wherein the primary drying time in step S1 is 2-8h, and the secondary drying time in step S4 is 4-10 h.

5. The method of claim 1, wherein the vacuum applied in step S3 is appliedThe degree of vacuum of the impregnation was 4X 10³-4.6×10³Pa。

6. The method as claimed in claim 1, wherein the temperature of the primary drying in the step S1 is 103-110 ℃, and the temperature of the secondary drying in the step S3 is 103-120 ℃.

7. The method for modifying hydrophobic insulation wood according to claim 1, wherein the room temperature vacuum impregnation time in step S3 is 1-6 h.

8. The method for modifying hydrophobic insulation wood according to claim 1, wherein the step S2 further comprises adding a modifier and a surfactant.

9. The method for modifying hydrophobic heat-preservation wood according to claim 8, wherein the modifier is a silane coupling agent, the surfactant is Tween 80, and the mass ratio of the modifier to the surfactant to the silica aerogel powder is 1:1: 10.

10. The method of claim 1, wherein the wood is poplar.

Technical Field

The invention relates to the technical field of boards, in particular to a hydrophobic heat-preservation wood modification method.

Background

At present, the heat insulation of the wall body mainly comprises 3 forms of internal heat insulation, external heat insulation and sandwich heat insulation, and China mainly uses external heat insulation of an external wall and internal heat insulation of the external wall at present. Although the external thermal insulation technology for the external wall has advantages in a plurality of aspects such as protecting a main body structure, ensuring the quality of an indoor wall surface, increasing the use area and the like, the requirements on used materials and construction quality are higher, and once cracks appear in the external thermal insulation layer, the external thermal insulation layer is difficult to treat. The adhesive, the outer glass fiber net and the like adopted in the outer heat insulation are imported for a long time, and are only adopted in high-grade public buildings before. The heat-insulating construction in the outer wall is to add a heat-insulating layer in the outer wall structure, and has the characteristics of low manufacturing cost, convenient installation, simple method and the like. Therefore, the application of the internal thermal insulation technology of the external wall is relatively wide. But also has problems, firstly, the heat-insulating layer is arranged in the wall body, so that the use area of the commodity house is reduced; secondly, secondary decoration of residents is influenced, heavy objects such as decorative pictures and the like cannot be hung on the indoor wall, and the internal heat insulation structure is easily damaged by hanging and fixing objects on the internal wall; the inner wall is easy to mildew and the like; finally, the inner heat insulation structure can cause two temperature fields to appear on the inner wall and the outer wall to form a temperature difference, the phenomenon of expansion with heat and contraction with cold of the outer wall surface is larger than the change of the inner wall surface, instability can be generated on the building structure, the heat insulation layer is easy to crack, and if the heat insulation structure is a wood-property light heat insulation building material disclosed in the Chinese patent with the publication number of 107540335A, the heat insulation decorative material on the market generally can release formaldehyde, and the environment friendliness is not enough.

Therefore, the heat preservation effect can be achieved to a certain degree through the modification of the interior decoration material.

Disclosure of Invention

In order to solve the problems, the invention provides a hydrophobic heat-preservation wood modification method, which improves the waterproof and heat-preservation effects of wood.

The technical scheme for solving the problem is that the hydrophobic heat-preservation wood modification method comprises the following steps:

s1, raw material processing: processing wood into a raw material single plate with the thickness of 1-3mm, sanding burrs and edges on the surface of the raw material single plate, drying in an oven for the first time after air drying, and drying till the raw material single plate is completely dried to obtain a dried single plate;

s2 silica aerogel dispersion: mixing silica aerogel powder with the particle size of 40nm-20 μm with ethanol, and uniformly stirring to obtain silica aerogel-ethanol impregnation liquid;

s3, dipping treatment: putting the dried veneer of S1 into the silicon dioxide aerogel-ethanol impregnation liquid of S2, and performing vacuum impregnation at normal temperature to obtain an impregnated veneer, wherein the volume ratio of the dried veneer to the silicon dioxide aerogel-ethanol impregnation liquid is 1: 1-3;

s4, secondary drying: putting the impregnated veneer of S3 into a drying oven for secondary drying until the weight is constant, and obtaining a crude product of the wood-silicon dioxide aerogel composite material;

s5, crude product processing: and (4) repeatedly treating the crude wood-silicon dioxide aerogel composite material obtained in the step S4 for 3-5 times through the steps S3 and S4 again to obtain the wood-silicon dioxide aerogel composite material.

Preferably, the length of the raw material single plate in the step S1 is 5cm-2220cm, the width is 1-1440cm, and the thickness is 1-3 cm.

Preferably, the concentration of the silica aerogel-ethanol impregnation liquid in the step S2 is 0.01% -0.1%.

Preferably, the primary drying time in the step S1 is 2-8h, and the secondary drying time in the step S4 is 4-10 h.

Preferably, the vacuum degree of the vacuum impregnation in the step S3 is 4X 103-4.6X 103 Pa.

Preferably, the temperature of the primary drying in the step S1 is 103-110 ℃, and the temperature of the secondary drying in the step S3 is 103-120 ℃.

Preferably, the normal-temperature vacuum impregnation time in the step S3 is 1-6 h.

Preferably, the step S2 further includes adding a modifier and a surfactant.

Preferably, the modifier is a silane coupling agent, the surfactant is tween 80, and the mass ratio of the modifier to the surfactant to the silica aerogel powder is 1:1: 10.

Preferably, the wood is poplar.

The invention has the beneficial effects that:

1. the wood modification production method is environment-friendly and pollution-free, and meanwhile, the production process can realize industrial continuous production, and is simple, high in production efficiency and controllable in performance;

2. the silicon dioxide aerogel is used for dipping and modifying the fast-growing poplar, so that the heat preservation effect is improved, the fast-growing poplar has hydrophobic property, the heat preservation effect and the waterproof effect can be realized, and the cost of indoor decoration is effectively saved;

3. the wood-silicon dioxide aerogel composite material with the heat insulation effect is obtained by wood modification, replaces an inner heat insulation layer of an outer wall, and enlarges the use area of a commercial house.

Drawings

FIG. 1 shows the test parameters of the products obtained in examples 1 to 6 and comparative example 1.

Detailed Description

In order to make the content of the present invention easier to understand, the technical solution of the present invention is further described below with reference to the specific embodiments, but the present invention is not limited thereto