Inorganic composite bamboo production process and composite bamboo

Abstract

The present invention provides an inorganic composite bamboo production process and composite bamboo, relating to the technical field of composite bamboo processes. Aiming at the problem that poor quality of the composite bamboo results from poor bonding between an inorganic adhesive and bamboo bundles during current inorganic composite bamboo production, the present invention pre-treats raw bamboo to obtain bamboo bundles, then transports the bamboo bundles to undergo a process of spraying the inorganic adhesive, extruding and immersing them, placing them in a mold for vibration and pressurization, and curing them, so that the inorganic adhesive and the bamboo bundles can be fully integrated, thereby improving the bonding between the bamboo bundles and between the bamboo bundles and the inorganic adhesive, and increasing the density of the formed composite bamboo, thereby ensuring the quality of the inorganic composite bamboo.

Description

Technical Field

[0001] The invention relates to the technical field of composite bamboo technology, and in particular to an inorganic composite bamboo production process and composite bamboo. Background Art

[0002] Developing composite bamboo technology is one of the effective ways to effectively utilize bamboo resources. Bamboo industrialization technology and products have developed rapidly. However, traditional composite bamboo still has problems with poor water resistance, corrosion resistance, mildew resistance, fire resistance, and light aging resistance. In addition, in the production process of composite bamboo, organic glues such as phenolic resin and urea-formaldehyde resin are mainly used as adhesives, which leads to the problem of formaldehyde release in composite bamboo products. This series of defects limits the application scope of composite bamboo and causes certain air pollution problems.

[0003] Currently, composite bamboo is mostly produced by bonding bamboo bundles together using organic glue. Multiple bamboo strands are coated with organic glue and then put into a mold for extrusion. After curing, the resulting composite bamboo is formed. However, composite bamboo produced using organic glue as a binder has low strength, poor flame retardancy, and environmental issues, failing to meet current market demand. Composite bamboo produced using inorganic adhesives offers high strength, strong flame retardancy, and is pollution-free. However, the use of inorganic adhesives in composite bamboo production presents numerous challenges. Equipment used to produce organic and inorganic composite bamboo is not universal, resulting in inadequate bonding between the inorganic adhesive and the bamboo bundles, and poor adhesion between adjacent bamboo bundles, impacting the quality of the inorganic composite bamboo. Summary of the Invention

[0004] The purpose of the present invention is to address the defects of the existing technology and provide an inorganic composite bamboo production process and composite bamboo. After the original bamboo is pretreated to obtain bamboo bundles, the bamboo bundles are transported to be sprayed with an inorganic adhesive, extruded and immersed, placed in a mold for vibration and pressurization, and maintained. The inorganic adhesive and the bamboo bundles can be fully integrated, the bonding between the bamboo bundles and the bamboo bundles and the inorganic adhesive is improved, and the density of the formed composite bamboo is increased, thereby ensuring the quality of the inorganic composite bamboo.

[0005] The first object of the present invention is to provide a production process for inorganic composite bamboo, which adopts the following scheme:

[0006] Pre-processing raw bamboo to obtain bamboo bundles;

[0007] When transporting bamboo bundles, inorganic adhesive is sprayed on the bamboo bundles to adhere to them, and the inorganic adhesive not attached to the bamboo bundles gathers to form an adhesive pool;

[0008] Applying pressure to the bamboo bundle at the adhesive pool position causes the bamboo bundle to expand laterally, with the expanded portion immersed in the adhesive pool;

[0009] The bamboo bundles passing through the adhesive pool carry the inorganic adhesive into the mold, the bamboo bundles are stacked to fill the mold, and the mold is closed and pressurized.

[0010] The formed bamboo bundles and the mold are cured together for the first time. After the first curing is completed, the mold is removed to obtain the composite bamboo, and the composite bamboo is cured again.

[0011] Furthermore, the pre-processing of raw bamboo includes:

[0012] Splitting the original bamboo to obtain sheet materials, and crushing and decomposing the sheet materials to obtain mesh bamboo sheets;

[0013] The mesh bamboo pieces are carbonized and dried to obtain bamboo bundles.

[0014] Furthermore, the obtained bamboo bundles are continuous along the length direction and separated discontinuously along the direction perpendicular to the length direction.

[0015] Furthermore, when conveying the bamboo bundles, the conveying surface is provided with an inclined segment, the lowest point of the inclined segment forms an adhesive pool, and the inorganic adhesive is sprayed at an upstream position of the adhesive pool.

[0016] Furthermore, the bamboo bundle is squeezed from above the conveying surface, and the bamboo bundle is bent by the squeezing action at the adhesive pool, and the bent position generates lateral expansion, and the inorganic adhesive enters the gap generated by the lateral expansion of the bamboo bundle.

[0017] Furthermore, the sprayed inorganic adhesive is added to the adhesive pool, and the inorganic adhesive overflowing from the adhesive pool is recovered and circulated.

[0018] Furthermore, when stacking the bamboo bundles into the mold, the bamboo bundles are stacked above the mold opening, and pressure is applied to force all the bamboo bundles into the mold to fill it tightly.

[0019] Furthermore, when the bamboo bundle supported by the mold is pressurized, vibration is applied to expel bubbles in the bamboo bundle and the inorganic adhesive.

[0020] Furthermore, after the mold is closed by vibration and pressure, it is subjected to bidirectional loading.

[0021] The second object of the present invention is to provide a composite bamboo obtained by using the inorganic composite bamboo production process as described in the first object.

[0022] Compared with the prior art, the present invention has the following advantages and positive effects:

[0023] (1) In order to solve the problem of poor quality of composite bamboo caused by poor bonding between inorganic adhesive and bamboo bundles during the current production of inorganic composite bamboo, the original bamboo is pretreated to obtain bamboo bundles, and then the bamboo bundles are transported for spraying with inorganic adhesive, extrusion immersion, mold vibration pressurization, and curing processes, so that the inorganic adhesive and bamboo bundles can be fully integrated, the bonding between the bamboo bundles and the bamboo bundles and the inorganic adhesive is improved, and the density of the composite bamboo formed is increased, thereby ensuring the quality of the inorganic composite bamboo.

[0024] (2) The fusion is performed by spraying inorganic adhesive on the bamboo bundles being transported, so that the uniformly mixed inorganic adhesive can be obtained from the supply end in real time, thereby ensuring the bonding effect of the inorganic adhesive.

[0025] (3) After the inorganic adhesive is sprayed, the bamboo bundle is squeezed to bend and expand in the transverse direction, thereby increasing the degree of transverse discontinuous separation of the bamboo bundle and facilitating the inorganic adhesive to enter the transverse discontinuous separation position of the bamboo bundle, thereby achieving full grip; at the same time, the inorganic adhesive forms a tiny inorganic adhesive pool at the squeezing position of the bamboo bundle, and the local bamboo bundle that is laterally expanded after being squeezed is immersed in the tiny inorganic adhesive pool, thereby promoting the inorganic adhesive in the tiny inorganic adhesive pool to enter the discontinuous gap of the transverse expansion of the bamboo bundle, thereby improving the degree of fusion.

[0026] (4) The inorganic adhesive is continuously sprayed to replenish the tiny inorganic adhesive pool, and the tiny inorganic adhesive pool is continuously updated. An overflow port is set for the tiny inorganic adhesive pool, and the inorganic adhesive overflowing from the overflow port is collected and returned to the supply end, mixed with a large amount of raw materials in the supply end, and then recycled. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0028] Figure 1 Schematic diagram of the process for producing inorganic composite bamboo in Examples 1 and 2 of the present invention. DETAILED DESCRIPTION

[0029] Example 1

[0030] In a typical embodiment of the present invention, Figure 1 As shown, a production process of inorganic composite bamboo is given.

[0031] Currently, composite bamboo is mostly produced by bonding bamboo bundles together using organic glue. Multiple bamboo strands are coated with organic glue and then squeezed into a mold for forming. After curing, the resulting composite bamboo is formed. However, composite bamboo produced using organic glue as a binder has low strength and poor flame retardancy. Using inorganic glue as a binder also presents numerous challenges. The equipment used to produce organic and inorganic composite bamboo is not universal, resulting in inadequate bonding between the inorganic adhesive and the bamboo bundles, impacting the quality of the inorganic composite bamboo.

[0032] Based on this, this embodiment provides an inorganic composite bamboo production process, in which the inorganic adhesive is output to the bamboo bundle in a spraying manner, and the bamboo bundle is squeezed so that the bamboo bundle is immersed in the inorganic adhesive pool formed at the squeezing position, so that the inorganic adhesive fully grips the bamboo bundle, thereby improving the quality of the inorganic composite bamboo.

[0033] The inorganic composite bamboo production process in this embodiment will be described in detail below with reference to the accompanying drawings.

[0034] See also Figure 1 The production process of inorganic composite bamboo includes the pretreatment, transportation, spraying of inorganic adhesive, molding and maintenance of raw bamboo.

[0035] After pre-processing, the raw bamboo is obtained into bamboo bundles, which are then transported to a location where inorganic adhesives are sprayed;

[0036] Spraying inorganic adhesive on the bamboo bundles to fully blend the bamboo bundles with the inorganic adhesive;

[0037] The bamboo bundles with inorganic adhesive are transported to the mold position and stacked according to the mold size;

[0038] After the bamboo bundles are stacked in the mold, the mold is closed and vibrated and pressurized;

[0039] The mold and the bamboo bundle are sent to the curing room for curing. After the curing is completed, the mold is removed to obtain the composite bamboo, and the composite bamboo is sent to the curing room for curing again. After the curing is completed, it is shipped out of the factory.

[0040] The pretreatment of raw bamboo includes splitting, debonding, carbonizing and drying. The raw bamboo is processed into bamboo chips after splitting and debonding, and then carbonized and dried to obtain bamboo bundles that can be compounded with inorganic adhesives.

[0041] In this embodiment, the original bamboo is split to obtain sheet materials with a cross-sectional size of approximately 30 mm × 5 mm, and the length of the obtained sheet materials is consistent with the length of the original bamboo; the sheet materials are crushed and thinned to obtain mesh bamboo pieces that are discontinuously separated in the transverse direction and continuous in the longitudinal direction. After carbonization and drying, the mesh bamboo pieces are obtained to obtain bamboo bundles that can be used for production.

[0042] The inorganic adhesive is a suspension liquid formed by mixing various raw materials such as magnesium oxide and magnesium sulfate through a series of physical-chemical reactions. The inorganic adhesive in this embodiment can be the inorganic glue disclosed in CN111303775B and CN115108804A.

[0043] The uniformity of the inorganic adhesive's grip on the bamboo bundle is a key factor affecting the performance of composite bamboo materials. When traditional organic glue is combined with bamboo bundles, the bamboo bundles need to be immersed in a pool of organic glue, and the organic glue wraps the bamboo bundles from the outside. The organic glue is then fished out or dragged out of the pool. However, due to the lack of disturbance after the inorganic adhesive is injected into the container, the components in the inorganic adhesive will precipitate, resulting in uneven mixing of the components, affecting the bonding effect of the inorganic adhesive.

[0044] The inorganic adhesive used in this embodiment is difficult to store in large tanks, and traditional bamboo bundle processing methods make it difficult to fuse the inorganic adhesive and the bamboo bundles. To address this, the present application employs a method of spraying the inorganic adhesive onto the bamboo bundles during transport. The inorganic adhesive is sprayed from above the bamboo bundle transport station, with some adhering to the surface of the bamboo bundles and some landing on the surface of the transport equipment. This spraying method ensures that the inorganic adhesive is evenly mixed and delivered to the bamboo bundles in real time, ensuring a consistent bonding effect.

[0045] After spraying the bamboo bundles with inorganic adhesive, the adhesive only adheres to the surface and has difficulty penetrating the intermittent, horizontal separations formed by debonding. During the bamboo bundle production process, the raw bamboo is crushed. During this process, the degree of debonding varies depending on the bamboo strips. Severe debonding results in multiple strips with fewer horizontal connections, making them easier for the inorganic adhesive to grasp. Slightly debonded strips have tighter horizontal connections, making them difficult for the inorganic adhesive to grasp. This results in poor integration between the inorganic adhesive and the bamboo bundle, affecting the bonding effect.

[0046] To this end, in this embodiment, the bamboo bundles are squeezed after the inorganic adhesive is sprayed, so that the bamboo bundles are bent and expanded in the transverse direction, thereby increasing the degree of transverse discontinuous separation of the bamboo bundles and facilitating the inorganic adhesive to enter the transverse discontinuous separation position of the bamboo bundles.

[0047] At the same time, there is an inclined surface between the spraying position and the bamboo bundle extrusion position. The inorganic adhesive that is not attached to the bamboo bundle during spraying gradually converges toward the extrusion position along the inclined surface, so that the inorganic adhesive forms a tiny inorganic adhesive pool at the extrusion position of the bamboo bundle, so that the local bamboo bundle that expands laterally after being squeezed is immersed in the tiny inorganic adhesive pool, and the inorganic adhesive in the tiny inorganic adhesive pool is promoted to enter the discontinuous gaps of the laterally expanded bamboo bundle, thereby achieving full grip.

[0048] Under the premise of not damaging or breaking the bamboo bundles, the bamboo bundles are deformed, the transverse connection gaps of the bamboo bundles are increased, and the inorganic adhesive can enter the gaps of the bamboo bundles more smoothly, so that the inorganic adhesive can fully grip the bamboo bundles.

[0049] When the bamboo bundles are transported, the inorganic adhesive is collected in a tiny inorganic adhesive pool. As the inorganic adhesive is continuously sprayed, the tiny inorganic adhesive pool is replenished. In order to keep the tiny inorganic adhesive pool constantly updated, an overflow port is set for the tiny inorganic adhesive pool, and the inorganic adhesive overflowing from the overflow port is collected and returned to the supply end, where it is mixed with a large amount of raw materials in the supply end and recycled.

[0050] In this embodiment, the supply end can use a hopper, inject the inorganic adhesive into the hopper, pump it to the top of the conveyor for spraying through a glue sprayer, recover the overflowed inorganic adhesive to the hopper, and mix the inorganic adhesive in the hopper for spraying.

[0051] like Figure 1 As shown, bamboo bundles are transported by a conveyor, and inorganic adhesive is sprayed onto the bamboo bundles on the conveyor by a glue sprayer. After the bamboo bundles and the inorganic adhesive are fully wrapped and fused, they are transported to the mold. Because there are many gaps between the bamboo bundles when they are stacked in the mold, before closing the mold, bamboo bundles are placed and piled on top of the mold. The bamboo bundles are squeezed by the top cover of the mold to continuously reduce their volume. Combined with the vibration effect, bubbles are expelled, and eventually all the bamboo bundles enter the mold, making the bamboo wood in the mold densely filled. In this embodiment, the vibration frequency applied by the top cover during the squeezing of the bamboo bundles is 50 Hz / s, the vibration load is controlled at 500-800 kg, and the vibration time is 6 minutes.

[0052] After the bamboo bundles are filled into the mold, they are placed in a press for loading to fully fuse the inorganic adhesive and the bamboo bundles; bidirectional loading is adopted and the loading is controlled at 3Mpa.

[0053] When carbonizing bamboo bundles, the temperature is required to be 150-180℃; the transmission speed of the conveyor is 2m / s, and the feeding of the bamboo bundle is controlled at 10-12cm 2 / times, the glue sprayer sprays the inorganic adhesive at a rate of 12-15L / min. A glue receiving tray is provided under the conveyor, which is connected to the hopper of the glue sprayer to recycle the recovered inorganic adhesive.

[0054] After the mold is loaded by the press, the mold and the bamboo bundle inside are transferred to the curing room for curing. After curing for 20-24 hours, the mold is removed to obtain the composite bamboo. After the composite bamboo is cured for another 150 hours, the corresponding post-processing such as sawing can be carried out.

[0055] Example 2

[0056] In another embodiment of the present invention, a composite bamboo is provided.

[0057] Composite bamboo is prepared by the inorganic composite bamboo production process in Example 1. The process of the inorganic composite bamboo production process is as follows: Figure 1 As shown, composite bamboo is obtained and processed to be used as a building material.

[0058] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A production process for inorganic composite bamboo, characterized in that: include: Pre-processing raw bamboo to obtain bamboo bundles; When transporting bamboo bundles, inorganic adhesive is sprayed on the bamboo bundles to adhere to them, and the inorganic adhesive not attached to the bamboo bundles gathers to form an adhesive pool; Applying pressure to the bamboo bundle at the adhesive pool position causes the bamboo bundle to expand laterally, with the expanded portion immersed in the adhesive pool; The bamboo bundles passing through the adhesive pool carry the inorganic adhesive into the mold, the bamboo bundles are stacked to fill the mold, and the mold is closed and pressurized. The formed bamboo bundle and the mold are cured together for the first time. After the first curing is completed, the mold is removed to obtain the composite bamboo, and the composite bamboo is cured again. When conveying bamboo bundles, the conveying surface is provided with an inclined segment, the lowest point of the inclined segment forms an adhesive pool, and the inorganic adhesive is sprayed at the upstream position of the adhesive pool; The bamboo bundle is squeezed from above the conveying surface. The bamboo bundle is squeezed and bent at the adhesive pool. The bent position expands laterally, and the inorganic adhesive enters the gaps formed by the expansion of the bamboo bundle. The pre-processing of raw bamboo includes: splitting the raw bamboo to obtain sheet materials, and crushing and decomposing the sheet materials to obtain mesh bamboo chips; Carbonizing and drying the mesh bamboo sheets to obtain bamboo bundles; An overflow port is provided for the micro inorganic adhesive pool, and the inorganic adhesive overflowing from the overflow port is collected and returned to the supply end, where it is mixed with a large amount of raw materials in the supply end and then recycled; The obtained bamboo bundles are continuous along the length direction and separated discontinuously along the direction perpendicular to the length direction; The sprayed inorganic adhesive is replenished into the adhesive pool, and the inorganic adhesive overflowing from the adhesive pool is recycled. The conveyor has a transmission speed of 2m / s, and the bamboo bundle loading is controlled at 10-12cm2 / time. The glue sprayer sprays the inorganic adhesive at a rate of 12-15L / min. A glue receiving tray is provided under the conveyor, connected to the glue sprayer's hopper, to recycle the recovered inorganic adhesive. The inorganic binder is in a suspended liquid state; The initial curing time is 20-24 hours, and the secondary curing time is more than 150 hours.

2. The inorganic composite bamboo production process according to claim 1, characterized in that: When stacking bamboo bundles into the mold, the bamboo bundles are stacked above the mold opening, and pressure is applied to force all the bamboo bundles into the mold to fill it tightly.

3. The inorganic composite bamboo production process according to claim 2, characterized in that: When the bamboo bundle placed in the mold is pressurized, vibration is applied to expel air bubbles from the bamboo bundle and the inorganic binder.

4. The inorganic composite bamboo production process according to claim 3, characterized in that: After the mold is closed by vibration and pressure, it is loaded in both directions.

5. A composite bamboo, characterized in that: The method is obtained by the inorganic composite bamboo production process according to any one of claims 1 to 4.

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