Bamboo bundle laminated board as well as preparation method and application thereof

Abstract

The invention relates to the technical field of plate processing, and provides a bamboo bundle laminated plate and a preparation method and application thereof. The method comprises the following steps: (1) bamboo wood is rolled and defibered to form bamboo bundles, and the bamboo bundles are woven into a curtain and dried to obtain a bamboo bundle curtain; (2) rolling and defibering the bamboo bundle curtains before the bamboo bundle curtains are impregnated and / or rolling and defibering the bamboo bundle curtains after the bamboo bundle curtains are impregnated; and (3) carrying out hot press molding on the bamboo bundle curtain obtained in the step (2) to obtain the bamboo bundle laminated board. The method is simple in process and convenient to operate, the industrial production efficiency of the thin bamboo bundle laminated board is improved, the prepared bamboo bundle laminated board is small in thickness, more uniform in density distribution and low in weight, the requirements for light weight and thinness of the board are met, the bamboo bundle laminated board has high strength and stability, and the bamboo bundle laminated board can be widely applied to the field of furniture. The composite board can be applied to the fields of buildings, traffic, industry and the like as thin boards such as wallboards and decorative boards.

Description

Technical Field

[0001] The invention relates to the technical field of plate processing, and in particular to a bamboo bundle laminated board and a preparation method and application thereof. Background Art

[0002] Recombinant bamboo is a high-performance bamboo fiber composite material independently developed by China. It is made of bamboo bundles obtained by splitting bamboo stalks through broom-like rolling equipment, and then impregnated, paved, and hot-pressed. It has the characteristics of high raw material utilization, good outdoor durability, and excellent mechanical properties. It is widely used in outdoor flooring, architectural decoration, transportation and other fields. However, recombinant bamboo products made of mixed bamboo bundles have disadvantages such as heavy weight, thick thickness, and uneven paving quality, which limit its lightweight and thin application. Therefore, bamboo bundle curtains (also known as bamboo bundle veneers, whole-sheet bamboo bundle veneers, whole-sheet bamboo bundle fibers, etc.) woven by whole-sheet weaving equipment are laminated and paved with uniform density and stable dimensions. Different layers can be functionally processed and have a high degree of designability.

[0003] However, the thickness of bamboo bundle veneer laminated wood is still relatively large. When used as thin building materials such as wall panels and decorative panels, it is heavy and has excessive mechanical properties, making it difficult to give full play to its advantages. Due to the size effect, the bamboo bundles prepared by the existing rolling and decomposition technology have problems such as insufficient uniformity, and large gaps between adjacent bamboo bundles of the bamboo bundle curtain woven from bamboo bundles. Especially after the bamboo bundle curtain has gone through the drying process, these gaps will further increase due to the shrinkage characteristics of bamboo, thereby reducing the uniformity of the bamboo bundle curtain and causing the bamboo bundle laminated thin plate to be easily deformed during use, which is not conducive to the dimensional stability and strength improvement of the bamboo bundle laminated thin plate, affecting its application effect and service life. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the prior art at least to a certain extent. To this end, one object of the present invention is to provide a bamboo bundle laminate and a preparation method and application thereof.

[0005] In a first aspect of the present invention, the present invention provides a method for preparing a bamboo bundle laminate, the method comprising: S10: The bamboo is crushed and loosened into bamboo bundles, which are then woven and dried. In this step, the bamboo material is rolled and fluffed to form a bamboo bundle, which has a three-dimensional mesh pore structure, and then the bamboo bundle is woven and dried to obtain a bamboo bundle curtain. The bamboo bundle curtain is also called bamboo bundle veneer, whole bamboo bundle veneer, whole bamboo bundle fiber, etc.

[0006] According to the preparation method of the bamboo bundle laminated board of the present invention, the rolling and deflaking comprises: splitting the bamboo material into bamboo strips with a width of 20 mm to 60 mm, and the deflaking rollers of the rolling and deflaking machine roll and deflake both sides of the bamboo strips to obtain the bamboo bundles. Furthermore, the gap between the upper and lower deflaking rollers of the rolling and deflaking machine is adjusted according to the thickness of the bamboo strips, and the bamboo bundles are rolled and deflaked through 10 to 16 deflaking rollers.

[0007] According to the method for preparing the bamboo bundle laminate of the present invention, the curtain weaving method includes: manually weaving or curtain weaving machine weaving to horizontally link the bamboo bundles in parallel to weave the whole bamboo bundle curtain.

[0008] It should be noted that the woven bamboo bundle curtain is dried for the purpose of facilitating storage, transportation and the next step. The specific drying conditions can be selected by those skilled in the art according to actual conditions.

[0009] According to the method for preparing the bamboo bundle laminate of the present invention, the thickness of the bamboo bundle curtain is not greater than 1 cm. For example, the thickness of the bamboo bundle curtain is 10 mm, 8 mm, 5 mm, 3 mm, 2 mm, 1 mm, etc., or a range between any two of the above values.

[0010] S20: Rolling and detangling the bamboo curtain before dipping in glue and / or rolling and detangling the bamboo curtain after dipping in glue According to the preparation method of the bamboo bundle laminated board of the present invention, the bamboo bundle curtain obtained in S10 is roller-pressed and deflaked, and then the roller-pressed and deflaked bamboo bundle curtain is dipped in glue. By roller-pressing and deflaking the bamboo bundle curtain, the degree of bamboo bundle fibrillation is further increased without cutting the bamboo fiber, the thickness of the bamboo bundle curtain is reduced, the width of the bamboo bundle in the bamboo bundle curtain is increased, and the gap between the bamboo bundles in the bamboo bundle curtain is reduced, so as to ensure the integrity of the bamboo bundle and the integrity and uniformity of the bamboo bundle curtain. Furthermore, the thickness of the bamboo bundle curtain after roller-pressing and deflaking is not more than 10 mm, for example, the thickness after roller-pressing and deflaking is 1 mm to 10 mm.

[0011] According to the method for preparing the bamboo bundle laminate of the present invention, the bamboo bundle curtain obtained in S10 is subjected to roller decompression after being dipped in glue, which can release the internal stress of the bamboo bundle curtain and effectively reduce the thickness of the bamboo bundle curtain. Furthermore, the thickness of the bamboo bundle curtain after the dipped in glue treatment after roller decompression is not greater than 10 mm, for example, the thickness after roller decompression is 1 mm to 10 mm.

[0012] According to the preparation method of the bamboo bundle laminated board of the present invention, the bamboo bundle curtain obtained in S10 is rolled and deflaked, and then the rolled and deflaked bamboo bundle curtain is dipped in glue, and then rolled and deflaked again after the dipped in glue. Rolling and deflaking are performed before and after the dipped in glue treatment, which can effectively reduce the thickness of the bamboo bundle curtain, reduce the gap between the bamboo bundles, release the internal stress of the bamboo bundle curtain, improve the uniformity, stability and strength of the final bamboo bundle laminated board, and extend the service life of the bamboo bundle laminated board. Furthermore, the thickness of the bamboo bundle curtain after the dipped in glue treatment after rolling and deflaking is not more than 10 mm, for example, the thickness after rolling and deflaking is 1 mm to 10 mm.

[0013] According to the preparation method of the bamboo bundle laminated board of the present invention, the dipping comprises: dipping the bamboo bundle curtain after roller pressure decompression or the bamboo bundle curtain without roller pressure decompression for 5 to 40 minutes and then drying. It should be noted that the glue used for dipping is a conventional material in the field, and those skilled in the art can choose it according to actual conditions. For example, the glue used for dipping includes but is not limited to phenolic resin, isocyanate, polyurethane, melamine formaldehyde resin, urea-formaldehyde resin, white latex, protein glue, inorganic glue, mixed glue and modified glue of adhesive, etc.

[0014] S30: hot pressing the bamboo curtain obtained in S20 In this step, the bamboo bundle curtain obtained in S20 is subjected to hot press molding to obtain a thin bamboo bundle laminate with stable dimensions and high mechanical strength.

[0015] According to the method for preparing the bamboo bundle laminated board of the present invention, the pressure of the hot pressing molding is 1 MPa to 25 MPa. For example, the pressure is 1 MPa, 3 MPa, 5 MPa, 10 MPa, 15 MPa, 20 MPa, 25 MPa, etc., or a range between any two of the above values. By controlling the pressure of the hot pressing molding within the above range, the strength and stability of the bamboo bundle laminated board can be improved.

[0016] According to the preparation method of the bamboo bundle laminate of the present invention, the holding time of the hot pressing molding is 5 min to 50 min, and the holding temperature is 135°C to 155°C. For example, the holding time is 5 min, 10 min, 20 min, 30 min, 40 min, 50 min, etc., or the range between any two values ​​of the above points; the holding temperature is 135°C, 140°C, 145°C, 150°C, 155°C, etc., or the range between any two values ​​of the above points. The above is the holding temperature and holding time using phenolic resin as the adhesive, which can be flexibly adjusted according to the curing temperature and curing time of the selected glue.

[0017] According to the method for preparing the bamboo bundle laminated board of the present invention, the overall thickness of the bamboo bundle curtain used in the hot pressing molding is 3 mm to 25 mm. By controlling the thickness of the bamboo bundle curtain within the above range, the uniformity of the bamboo bundle laminated board can be effectively improved and the density can be reduced while maintaining the strength. It should be noted that the thickness of the bamboo bundle curtain refers to the total thickness of the single-layer bamboo bundle curtains obtained by stacking several S20.

[0018] In a second aspect of the present invention, a bamboo bundle laminate is provided, wherein the bamboo bundle laminate is prepared by the above method, so that the bamboo bundle laminate has high strength, excellent stability and long service life.

[0019] According to the bamboo bundle laminated board of the present invention, the thickness of the bamboo bundle laminated board is not more than 8 mm. For example, the thickness of the bamboo bundle laminated board is 8 mm, 7 mm, 6 mm, 5 mm, 4 mm, 3 mm, 2 mm, etc., or a range between any two of the above values. The bamboo bundle laminated board of the present invention has a small thickness and a low weight, and realizes the lightweight requirement of the board. The bamboo bundle laminated board has high strength and stability, and can be used as thin building materials such as wall panels and decorative panels.

[0020] According to a third aspect of the present invention, the present invention proposes the application of the above-mentioned bamboo bundle laminate in the fields of building materials, transportation, and industry.

[0021] The present invention has at least the following technical effects: (1) The existing rolling and fluffering process uses fluffering teeth to fluffer bamboo bundles, which may cause fiber breakage. Unlike rolling fluffering, roller fluffering can achieve interface separation between bamboo fiber and thin-walled cells without cutting the fiber through mechanical extrusion, which can effectively retain the integrity and strength of the fiber while increasing the degree of bamboo bundle fissure and reduce internal stress, thereby improving the strength and stability of the bamboo bundle laminate. In addition, the present invention rolls and fluffers the entire bamboo bundle curtain after weaving, which is not only conducive to reducing the gaps between bamboo bundles and reducing the thickness of the bamboo bundle curtain, but also conducive to improving the industrial production efficiency of thin bamboo bundle laminates.

[0022] (2) This method has simple process and convenient operation, which improves the industrial production efficiency of thin bamboo bundle laminated boards. The prepared bamboo bundle laminated boards have a smaller thickness, more uniform density distribution, and lower weight, thus achieving the requirements of lightweight and thin board materials. The bamboo bundle laminated boards have high strength and stability and can be used as thin boards such as wall panels and decorative panels in the fields of construction, transportation, and industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 This is a physical picture of the bamboo bundle laminate prepared in Example 3 of the present invention. DETAILED DESCRIPTION

[0025] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention is described below with reference to specific embodiments. It should be noted that these embodiments are merely illustrative and do not limit the present invention in any way.

[0026] Example 1 The preparation process of the bamboo bundle laminate of Example 1 is as follows (curtain weaving-rolling before dipping): (1) After the bamboo is deflated into bamboo bundles by a rolling and deflation machine, the bamboo bundles are horizontally linked and woven in parallel into a whole bamboo bundle curtain and dried. The thickness of a single bamboo bundle curtain after drying is about 5 mm.

[0027] (2) The dried bamboo bundle curtain was rolled and fluffed. After rolling, the gaps between adjacent bamboo bundles became smaller and the thickness of the bamboo bundle curtain decreased. The thickness of a single bamboo bundle curtain after rolling was about 3 mm. The rolled and fluffed bamboo bundle curtain was immersed in phenolic resin for 20 min, taken out and drained, and air-dried at 65 °C to a moisture content of 10%-15%.

[0028] (3) Three layers of the above-mentioned bamboo bundle curtains after being impregnated with glue were stacked and assembled (the thickness of the bamboo bundle curtains after stacking was 9 mm), and the hot pressing process of "cold in-cold out" was used for forming. The hot pressing temperature was 145°C, the pressure was 19 MPa, the pressure was maintained for 20 min, and the cooling time was 20 min. The specified thickness was 6 mm, and the bamboo bundle laminated board with a thickness of 6 mm was obtained.

[0029] Example 2 The preparation process of the bamboo bundle laminate of Example 2 is as follows (weaving curtains-dipping and then rolling): (1) After the bamboo is deflated into bamboo bundles by a rolling and deflation machine, the bamboo bundles are horizontally linked and woven in parallel into a whole bamboo bundle curtain and dried. The thickness of a single bamboo bundle curtain after drying is about 5 mm.

[0030] (2) The dried bamboo bundle curtain was immersed in phenolic resin for 20 min, then taken out and drained, and air-dried at 65°C until the moisture content was 10%-15%. The bamboo bundle curtain was rolled and debonded. After rolling, the gaps between adjacent bamboo bundles became smaller and the thickness of the bamboo bundle curtain decreased. The thickness of a single bamboo bundle curtain after rolling and debonding was about 3 mm.

[0031] (3) Three layers of the above-mentioned bamboo bundle curtains after roller pressing and decompression were used for assembly and paving (the thickness of the bamboo bundle curtains after lamination was 9 mm), and the hot pressing process of "cold in-cold out" was adopted with the following conditions: hot pressing temperature was 145 °C, pressure was 19 MPa, pressure was maintained for 20 min, and cooling was performed for 20 min. The specified thickness was 6 mm, and the bamboo bundle laminated board with a thickness of 6 mm was obtained by hot pressing.

[0032] Example 3 The preparation process of the bamboo bundle laminate of Example 3 is as follows (rolling before and after weaving curtains and dipping): (1) After the bamboo is deflated into bamboo bundles by a rolling and deflation machine, the bamboo bundles are horizontally linked and woven in parallel into a whole bamboo bundle curtain and dried. The thickness of a single bamboo bundle curtain after drying is about 5 mm.

[0033] (2) The dried bamboo bundle curtain was rolled and fluffed. After rolling, the gaps between adjacent bamboo bundles became smaller and the thickness of the bamboo bundle curtain was reduced. The bamboo bundle curtain after roller pressing and fluffing was immersed in phenolic resin for 20 min, then taken out and drained. It was air-dried at 65℃ until the moisture content was 10%-15%. The bamboo bundle curtain after impregnation and drying was rolled and fluffed again. After rolling, the gaps between adjacent bamboo bundles became smaller and the thickness of the bamboo bundle curtain was reduced. The thickness of a single bamboo bundle curtain after roller pressing and fluffing was about 3 mm.

[0034] (3) Three layers of the above-mentioned bamboo bundle curtains after roller pressing and decomposition are used for assembly and paving (the thickness of the bamboo bundle curtains after lamination is 9 mm), and the hot pressing process of "cold in-cold out" is used for forming at a hot pressing temperature of 145°C, a pressure of 19 MPa, a pressure holding time of 20 min, and a cooling time of 20 min. The specified thickness is 6 mm, and a bamboo bundle laminate with a thickness of 6 mm is obtained. For specific objects, please refer to Figure 1 .

[0035] Example 4 The main differences between the preparation process of the bamboo bundle laminated board of Example 4 and the preparation process of the bamboo bundle laminated board of Example 3 are as follows: (3) Three layers of the above-mentioned bamboo bundle curtains after roller pressing and decompression were used for assembly and paving (the thickness of the bamboo bundle curtains after lamination was 9 mm), and the hot pressing process of "cold in-cold out" was adopted with the following conditions: hot pressing temperature was 145 °C, pressure was 3 MPa, pressure was maintained for 20 min, and cooling was performed for 20 min. The specified thickness was 6 mm, and the bamboo bundle laminated board with a thickness of 6.5 mm was obtained.

[0036] Example 5 The main differences between the preparation process of the bamboo bundle laminated board of Example 5 and the preparation process of the bamboo bundle laminated board of Example 3 are as follows: (3) Three layers of the above-mentioned bamboo bundle curtains after roller pressing and decompression were used for assembly and paving (the thickness of the bamboo bundle curtains after lamination was 9 mm), and the hot pressing process of "cold in-cold out" was used for forming with a hot pressing temperature of 145°C, a pressure of 25 MPa, a holding pressure of 20 min, and a cooling time of 20 min. The specified thickness was hot pressed at 6 mm, and a bamboo bundle laminate with a thickness of 6 mm was obtained. Excessive hot pressing pressure can easily lead to energy waste and increase costs.

[0037] Comparative Example 1 (1) After the bamboo is deflated into bamboo bundles by a rolling and deflation machine, the bamboo bundles are horizontally linked and woven in parallel into a whole bamboo bundle curtain and dried. The thickness of the bamboo bundle curtain after drying is 5 mm.

[0038] (2) Immerse the dried bamboo bundle curtain in phenolic resin for 20 min, then take it out and drain it, and air-dry it at 65°C until the moisture content is 10%~15%.

[0039] (3) Three layers of impregnated and dried bamboo bundle curtains were stacked and assembled (the thickness of the bamboo bundle curtains after stacking was 15 mm). The hot pressing process of "cold in-cold out" was used, with a hot pressing temperature of 145°C, a pressure of 19 MPa, a holding pressure of 20 min, and a cooling time of 20 min. The specified thickness was 6 mm, and a bamboo bundle laminate with a thickness of 6 mm was obtained.

[0040] The properties of the bamboo bundle laminates prepared in Examples 1-5 and Comparative Example 1 were tested, and the specific method was as follows: (1) The 24-hour water absorption thickness expansion rate, flexural strength and flexural modulus of bamboo bundle laminated boards were tested according to the board test method of standard GB / T 17657; (2) The warpage of bamboo bundle laminated board was tested according to the test method of GB / T 40241.

[0041] The performance test results of the bamboo bundle laminates prepared in Examples 1-5 and Comparative Example 1 are shown in Table 1.

[0042] Table 1

[0043] As shown in Table 1, the 24-hour water absorption thickness expansion rate, flexural strength, flexural modulus and warpage of the bamboo bundle laminated board prepared by rolling the bamboo bundle curtain are all improved compared with those prepared by the bamboo bundle curtain without rolling, and the 24-hour water absorption thickness expansion rate, flexural strength, flexural modulus and warpage of the bamboo bundle laminated board prepared by rolling the bamboo bundle curtain before and after dipping are the best. Therefore, further rolling and debonding the bamboo bundle curtain is beneficial to improving the dimensional stability and mechanical strength of the bamboo bundle laminated board.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a bamboo bundle laminate, characterized in that: include: (1) The bamboo is crushed and loosened to form bamboo bundles, which are then woven and dried to obtain bamboo bundle curtains; (2) rolling and detangling the bamboo bundle curtains before the bamboo bundle curtains are dipped in glue and / or rolling and detangling the bamboo bundle curtains after the bamboo bundle curtains are dipped in glue; (3) The bamboo bundle curtain obtained in step (2) is hot-pressed to obtain a bamboo bundle laminate.

2. The method according to claim 1, characterized in that: In step (1), the thickness of the bamboo curtain is not more than 1 cm.

3. The method according to claim 1, characterized in that: In step (2), the dipping in glue comprises: dipping the bamboo bundle curtain after roller-pressing and deflaking or the bamboo bundle curtain without roller-pressing and deflaking in glue for 5 min to 40 min and then drying.

4. The method according to claim 1 or 3, characterized in that: In step (2), the thickness of the bamboo curtain after being rolled and debonded is no more than 10 mm.

5. The method according to claim 1, characterized in that: In step (3), the pressure of the hot pressing molding is 1 MPa~25 MPa.

6. The method according to claim 1 or 5, characterized in that: In step (3), the holding time of the hot pressing molding is 5 min to 50 min, and the holding temperature is 135° C. to 155° C.

7. The method according to claim 1 or 5, characterized in that: In step (3), the thickness of the bamboo bundle curtain used in the hot pressing molding is 3 mm to 25 mm.

8. A bamboo bundle laminate, characterized in that: The method is prepared by any one of claims 1 to 7.

9. The bamboo bundle laminate according to claim 8, characterized in that: The thickness of the bamboo bundle laminate is not more than 8 mm.

10. Use of the bamboo bundle laminate according to claim 8 or 9 in the fields of building materials, transportation and industry.

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