CN104015240B - The processing method of a kind of anti-corrosion and high strength bamboo matter Visa plate - Google Patents

Abstract

The invention provides a processing method of a corrosion-resistant high-strength bamboo visa board, including the flattening technology of moso bamboo, the grading technology of the flattened bamboo slices of moso bamboo, the large sheet manufacturing technology of the single-layer flattened bamboo slices, the large-scale Advanced bamboo lumber manufacturing technology, slicing technology of bamboo lumber, splicing technology and storage technology of slicing bamboo boards, impregnation and low-temperature drying technology of non-alkali glass fiber cloth, and then through gluing, billet formation, hot pressing, sawing Board and board edge repair and waterproofing process, production of corrosion-resistant high-strength bamboo visa board that can replace imported birch board, this product has excellent physical and mechanical properties, and the product has high flatness. Due to the high yield rate (>70%) of the flattened bamboo board and the greatly simplified processing technology, the cost of the finished bamboo Visa board is greatly reduced, which has obvious competitive advantages.

Description

A processing method of corrosion-resistant high-strength bamboo visa board

technical field

The invention belongs to the field of material processing, and in particular relates to a processing method of a corrosion-resistant high-strength bamboo visa board.

Background technique

During the construction of traditional steel molds in the seaside dock caissons, sea-crossing bridges and sea-crossing expressways, because the steel molds cannot effectively resist the erosion of high salinity, high temperature and high humidity, the steel mold products are often worn out too quickly. There is even the situation that it is scrapped after being used once, which brings great economic losses to the construction unit. At present, the construction units of caissons in coastal wharves, cross-sea bridges and cross-sea expressways mostly use imported birch Visa boards instead of domestic steel mold products, but there is also the problem of high prices. At present, there is no domestic enterprise Produce related products that can replace imported birch Visa boards.

Based on the abundant moso bamboo resources in China, this invention uses my original moso bamboo flattening technology (patent application acceptance number: 201110423292.6) to produce corrosion-resistant high-strength bamboo visa boards that can replace imported birch boards. This product has excellent Excellent physical and mechanical properties, high product flatness. Due to the high yield rate (>70%) of the flattened bamboo board and the greatly simplified processing technology, the cost of the finished bamboo Visa board is greatly reduced, which has obvious competitive advantages. This technology can comprehensively improve the scientific and technological content and product added value of the moso bamboo product industry, so it has broad development prospects.

Contents of the invention

The object of the present invention is to provide a processing method of corrosion-resistant high-strength bamboo visa board. The corrosion-resistant high-strength bamboo visa board manufactured by the method has excellent physical and mechanical properties, high product flatness and good corrosion resistance. It can be used instead of imported all-birch Visa boards. Due to the high yield rate (>70%) of the flattened bamboo board and the greatly simplified processing technology, the cost of the finished bamboo Visa board is greatly reduced, which has obvious competitive advantages. This technology can comprehensively improve the scientific and technological content and product added value of the moso bamboo product industry, so it has broad development prospects.

To achieve the above object, the present invention adopts the following technical solutions:

A processing method of corrosion-resistant high-strength bamboo visa board comprises the following steps:

Step 1: According to the moso bamboo flattening technology (patent application acceptance number: 201110423292.6, the specific process is: first cut the moso bamboo into sections, break it, and then use a groove machine to process a group of oblique grooves on the inner wall of the moso bamboo, and then process the oblique lines The bamboo slices in the tank are soaked in a clear water pool, taken out after the moisture content of the bamboo slices reaches the specified requirements, put into the microwave oven, heated for a certain period of time, taken out, placed on the hot plate of the heat press machine, and flattened by heat. After the flat bamboo chips are taken out, they must be stacked neatly to prevent the flat bamboo chips from warping and deforming during the cooling process. After the flat bamboo chips are cooled and placed for a certain period of time, they will be processed by planing and sliding table saws to become standardized flat bamboo boards. ), producing flattened moso bamboo slices with a length of 1.35 meters, 2.56 meters and a width of 5-10 centimeters;

Step 2: Put the flattened bamboo slices of moso bamboo into a wood drying kiln for drying at a drying temperature of 80-100° C. and a drying time of 24-60 hours. After drying, the moisture content of the flattened bamboo slices is kept at about 8-10%;

Step 3: Send the dried moso bamboo slices into four-sided planers, and process them into specifications of 1320mm×(50～80)mm×5mm (length×width×thickness) or 2560mm×(50～80)mm×5mm (length×width×thickness) bamboo slices;

Step 4: Utilize the veneer grading equipment to classify the above two kinds of moso bamboo flakes with a flattened specification, and select the bamboo flakes with an elastic modulus of more than 7500 MPa, and set them aside;

Step 5: Select LK-DN60 two-component glulam glue to use as the adhesive for the graded moso bamboo slices to be flattened. Apply glue to the two sides of the flattened bamboo slices, and assemble the blanks according to the method shown in Figure 1. Hot pressing forms a large sheet of single-layer flattened bamboo chips;

Step 6: Apply glue to the large sheets of single-layer flattened bamboo chips, assemble the blanks according to the blanking method in Figure 2, and form large-sized bamboo squares by hot pressing;

Step 7: After placing the large-sized bamboo squares for 24-48 hours, send them into the veneer planer to produce large-sized sliced bamboo veneers with a thickness of 2mm, and then use the jigsaw machine to splice the sliced bamboo veneers Finishing: 2560mm×1320mm×2mm (length×width×thickness) or 1320mm×2560mm×2mm (length×width×thickness) two sizes of bamboo jigsaw panels, use the glue coating machine to coat the bamboo jigsaw panels of the above two specifications respectively Glue, spare;

Step 8: Cut the non-alkali glass fiber cloth into a size of 1320mm×2560mm×1mm (length×width×thickness), put it into a dipping tank filled with a water-soluble phenolic resin adhesive with a solid content of 40%, and add a weight Immerse the glass fiber cloth completely in the impregnating resin, take it out after 10 minutes, and then dry it further. The drying temperature is 70°C, and the drying time is 60 to 180 minutes. After the glue on the surface of the glass fiber cloth is no longer sticky, the glass fiber cloth is obtained. Fiber impregnated cloth, take out and set aside;

Step 9: Glue the glass fiber impregnated cloth 1 obtained in step 8, and the bamboo panels of two specifications obtained in step 7 2, 3 from top to bottom as 1, 2, 3, 2, 3, 2, 3, 2 , 3, 2, 1 in the form of billet assembly, and pressed into a bamboo visa board on a hot press;

Step 10: select some small moso bamboo pieces, put them into a drying oven and dry them to be absolutely dry, the drying temperature is 120°C, and the drying time is 24 hours. Put the small piece of moso bamboo that has been baked into absolute dryness into a pulverizer to pulverize, and the bamboo powder is passed through a 60-mesh sieve, and set aside;

Step 11: Prepare the above-mentioned bamboo powder with water-soluble phenolic resin, water-soluble waterproof paint and pigments to make a viscous putty that is consistent with the surface color of the bamboo visa board, which is used to repair possible irregularities in the sawing process of the bamboo visa board. Flatten the hole, after the repair is complete, let it stand for 30 minutes, and then scrape the putty with a scraper.

The veneer grading equipment in step 4 is TheMetriguard2800DMEVeneerTester veneer grading equipment produced in the United States.

The LK-DN60 two-component glulam glue selected in step 5 is produced by Beijing Century Likai Adhesive Technology Co., Ltd. The adhesive has excellent bonding strength, good water resistance, solvent resistance, and heat resistance; it meets the D4 waterproof requirements of EN204. The amount of glue applied on the side is controlled at 220-260g/m ² .

The hot press used by the single-layer flattened bamboo large sheet produced in the step 5 must have a side pressing device; hot press temperature 100～120°C, pressure (vertical direction) 1.0～1.4MPa, side pressing pressure (horizontal Direction) 0.2~0.5MPa, hot pressing time 5~10 minutes.

The step 6 is used to control the amount of glue applied by the gluing machine of the single-layer flattened bamboo board of large-sized bamboo squares at 280-360g/m2 ( ^double -sided), and the adhesive also uses Beijing Century Likai Adhesive Technology The LK-DN60 two-component glulam glue produced by the company; the specifications and sizes of the pressed bamboo squares are 2560mm×500mm×300mm (length×width×thickness) or 1320mm×500mm×300mm (length×width×thickness) ), the hot-pressing pressure of bamboo squares is 1.4-1.6MPa, the hot-pressing temperature is 100-120°C, and the hot-pressing time is 120-180 minutes.

In the step 7, the bamboo panels of two specifications and sizes are assembled by the jigsaw machine. If long-term storage is required, they must be stored in a constant temperature and humidity room with a temperature of 20-25°C and a relative humidity of 40-60%. Short-term storage can be used Wrapped with a large piece of plastic cloth to prevent unnecessary loss of bamboo panels due to climate and temperature (too dry and broken, too wet to mold).

The water-soluble phenolic resin adhesive in step 8 is self-made, and its formula is phenol (C ₆ H ₅ OH):formaldehyde (CH ₂ O):NaOH=1:3.1:0.24 (mass ratio of each substance), and the cured product content 49%, free formaldehyde content <0.153%, resin pH value 9.2; the selected alkali-free glass fiber cloth is glass fiber chopped strand mat or continuous strand mat; the phenolic resin impregnation amount of glass fiber impregnated cloth is 10-30% .

In the step 9, the hot-pressing pressure of the bamboo visa board is 1.2-1.5 MPa, the hot-pressing temperature is 135-150° C., and the hot-pressing time is 20-30 minutes.

In described step 10, select the moso bamboo block of some fritters as the raw material of processing bamboo powder, mainly consider that the two are the same material, the stress received in the drying and curing process is consistent, and different stresses will not be produced during curing deformation. The difference caused the putty to fall off and the repair failed.

The waterproof coating in the step 11 is a water-soluble polyurethane waterproof coating; the pigment is Sudan red.

The remarkable advantage of the present invention is that: the corrosion-resistant high-strength bamboo visa board produced by the present invention has excellent physical and mechanical properties, high flatness of the product, and good corrosion resistance. It can be used instead of imported all-birch Visa boards. Due to the high yield rate (>70%) of the flattened bamboo board and the greatly simplified processing technology, the cost of the finished bamboo Visa board is greatly reduced, which has obvious competitive advantages. This technology can comprehensively improve the scientific and technological content and product added value of the moso bamboo product industry, so it has broad development prospects.

Description of drawings

Fig. 1 is a schematic diagram of a large sheet of a single-layer flattened bamboo sheet according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of the structure and blank assembly of bamboo square timber according to the embodiment of the present invention.

detailed description

A kind of concrete steps of the processing method of corrosion-resistant high-strength bamboo quality visa plate are:

Step 1: According to the moso bamboo flattening technology invented by the applicant (patent application acceptance number: 201110423292.6, the specific process is: first cut the moso bamboo into sections and break it, and then use a groove machine to process a group of oblique grooves on the inner wall of the moso bamboo, and then The bamboo slices processed with inclined grooves are soaked in a clear water pool. After the moisture content of the bamboo slices reaches the specified requirements, take them out, put them in a microwave oven, take them out after heating for a certain period of time, and place them on the hot plate of a hot press machine for hot pressing. Flattening, the flattened bamboo slices must be stacked neatly after being taken out to prevent warping and deformation of the flattened bamboo slices during the cooling process. Flat bamboo boards.), the production of flattened moso bamboo chips with a length of 1.35 meters, 2.56 meters and a width of 5-10 cm;

Step 2: Put the flattened bamboo slices of moso bamboo into a wood drying kiln for drying at a drying temperature of 80-100° C. and a drying time of 24-60 hours. After drying, the moisture content of the flattened bamboo slices is kept at about 8-10%;

Step 3: Send the dried moso bamboo slices into four-sided planers, and process them into specifications of 1320mm×(50～80)mm×5mm (length×width×thickness) or 2560mm×(50～80)mm×5mm (length×width×thickness) bamboo slices;

Step 4: Utilize the veneer grading equipment to classify the above two kinds of moso bamboo flakes with a flattened specification, and select the bamboo flakes with an elastic modulus of more than 7500 MPa, and set them aside;

Step 5: Select LK-DN60 two-component glulam glue to use as the adhesive for the graded moso bamboo slices to be flattened. Apply glue to the two sides of the flattened bamboo slices, and assemble the blanks according to the method shown in Figure 1. Hot pressing forms a large sheet of single-layer flattened bamboo chips;

Step 6: Apply glue to the large sheets of single-layer flattened bamboo chips, assemble the blanks according to the blanking method in Figure 2, and form large-sized bamboo squares by hot pressing;

Step 7: After placing the large-sized bamboo squares for 24-48 hours, send them into the veneer planer to produce large-sized sliced bamboo veneers with a thickness of 2mm, and then use the jigsaw machine to splice the sliced bamboo veneers Finishing: 2560mm×1320mm×2mm (length×width×thickness) or 1320mm×2560mm×2mm (length×width×thickness) two sizes of bamboo jigsaw panels, use the glue coating machine to coat the bamboo jigsaw panels of the above two specifications respectively Glue, spare;

Step 8: Cut the non-alkali glass fiber cloth into a size of 1320mm×2560mm×1mm (length×width×thickness), put it into a dipping tank filled with a water-soluble phenolic resin adhesive with a solid content of 40%, and add a weight Immerse the glass fiber cloth completely in the impregnating resin, take it out after 10 minutes, and then dry it further. The drying temperature is 70°C, and the drying time is 60 to 180 minutes. After the glue on the surface of the glass fiber cloth is no longer sticky, the glass fiber cloth is obtained. Fiber impregnated cloth, take out and set aside;

Step 9: Glue the glass fiber impregnated cloth 1 obtained in step 8, and the bamboo panels of two specifications obtained in step 7 2, 3 from top to bottom as 1, 2, 3, 2, 3, 2, 3, 2 , 3, 2, 1 in the form of billet assembly, and pressed into a bamboo visa board on a hot press;

Step 10: select some small moso bamboo pieces, put them into a drying oven and dry them to be absolutely dry, the drying temperature is 120°C, and the drying time is 24 hours. Put the small piece of moso bamboo that has been baked into absolute dryness into a pulverizer to pulverize, and the bamboo powder is passed through a 60-mesh sieve, and set aside;

Step 11: Prepare the above-mentioned bamboo powder with water-soluble phenolic resin, water-soluble waterproof paint and pigments to make a viscous putty that is consistent with the surface color of the bamboo visa board, which is used to repair possible irregularities in the sawing process of the bamboo visa board. Flatten the hole, after the repair is complete, let it stand for 30 minutes, and then scrape the putty with a scraper.

Preferably, the veneer grading equipment used in step 4 is TheMetriguard2800DMEVeneerTester veneer grading equipment produced in the United States.

Preferably, the LK-DN60 two-component glulam panel glue used in step 5 is produced by Beijing Century Likai Adhesive Technology Co., Ltd.

Preferably, the amount of glue applied to the sides used in step 5 is controlled at 250g/m ² . The temperature of the hot press is 110° C., the pressure (vertical direction) is 1.2 MPa, the lateral pressure (horizontal direction) is 0.3 MPa, and the hot pressing time is 8 minutes.

Preferably, in the bamboo square timber production of step 6, the gluing machine gluing amount of single-layer flattened bamboo sheet is controlled at 300g/m ² (double-sided), and the hot pressing pressure of bamboo square timber is 1.5MPa, heat The pressing temperature is 110°C, and the hot pressing time is 150 minutes.

Preferably, the bamboo panels made in step 7 must be stored in a constant temperature and humidity room for long-term storage at a temperature of 22°C and a relative humidity of 50%; short-term storage can be wrapped with a large piece of plastic cloth to prevent the bamboo panels from being damaged by climate and temperature. Causes of unnecessary losses (too dry and broken, too wet to mold).

Preferably, the self-made water-soluble phenolic resin adhesive in step 8 has a formula of phenol (C ₆ H ₅ OH):formaldehyde (CH ₂ O):NaOH=1:3.1:0.24 (mass ratio of each substance).

Preferably, the alkali-free glass fiber cloth used in step 8 is glass fiber chopped strand mat or continuous strand mat; the phenolic resin impregnation amount of the glass fiber impregnated cloth is 15%.

Preferably, in step 9, the hot-pressing pressure of the bamboo Visa board is 1.3 MPa, the hot-pressing temperature is 145° C., and the hot-pressing time is 25 minutes.

Preferably, in step 11, the waterproof coating is a water-soluble polyurethane waterproof coating; the pigment is Sudan red.

The invention adopts a special process, and according to the moso bamboo flattening technology invented by the applicant (patent application acceptance number: 201110423292.6), the corrosion-resistant high-strength bamboo visa board manufactured has excellent physical and mechanical properties. According to LY/T1574-2000, the physical and mechanical properties of bamboo visa board are tested: its static bending strength reaches 120-150MPa, elastic modulus reaches 70-80MPa, and other properties reach the standard of bamboo cement formwork.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims (10)

1. a processing method of corrosion-resistant high-strength bamboo visa board, is characterized in that: comprise the following steps: Step 1: the length of production is 1.35 meters and 2.56 meters, and the width is 5-10 centimeters of moso bamboo to flatten bamboo chips; Step 2: putting the flattened bamboo slices of moso bamboo into a wood drying kiln for drying at a drying temperature of 80-100° C. and a drying time of 24-60 hours. After drying, the moisture content of the flattened bamboo slices of moso bamboo is 8-10%; Step 3: send the dried flattened moso bamboo slices to the four-sided planer, and process the bamboo slices with the specifications of 1320mm x (50-80) mm x 5mm or 2560mm x (50-80) mm x 5mm in length x width x thickness; Step 4: use veneer grading equipment to classify two kinds of moso bamboo flakes with flattened specifications, and select bamboo flakes with an elastic modulus of more than 7500 MPa, and set them aside; Step 5: Select LK-DN60 two-component glulam glue to use as the adhesive for the graded moso bamboo flakes, apply glue on both sides of the moso bamboo flakes, form a billet, and heat press to form a single A large sheet of moso bamboo with flattened specifications; Step 6: Apply glue to the large boards, assemble the blanks, and hot press to form large-sized bamboo squares; Step 7: After placing the bamboo squares for 24-48 hours, send them into the veneer cutting machine to produce large-size sliced bamboo veneers with a thickness of 2mm, and then use the jigsaw machine to splice the sliced bamboo veneers to grow × Width × thickness is 2560mm × 1320mm × 2mm and 1320mm × 2560mm × 2mm two sizes of bamboo jigsaw panels, use the glue machine to apply glue to the bamboo jigsaw panels of the two specifications and sizes, and set aside; Step 8: Cut the non-alkali glass fiber cloth to the size of length×width×thickness 1320mm×2560mm×1mm, put it into the impregnation tank filled with water-soluble phenolic resin adhesive with a solid content of 40%, and add weights to make the non-alkali The glass fiber cloth is completely immersed in the water-soluble phenolic resin adhesive. After 10 minutes, take it out and drain it, and then dry it further. The drying temperature is 70°C and the drying time is 60-180 minutes. After the glue on the surface of the glass fiber cloth is no longer sticky, Obtain glass fiber impregnated cloth for subsequent use; Step 9: Apply glue to the glass fiber impregnated cloth 1 obtained in step 8, the size of 2560 mm × 1320 mm × 2 mm bamboo panel 2 obtained in step 7, and the size of 1320 mm × 2560 mm × 2 mm bamboo panel 3 obtained in step 7, The blanks are assembled in the form of 1, 2, 3, 2, 3, 2, 3, 2, 3, 2, 1 from top to bottom, and pressed into a bamboo visa board on a hot press; Step 10: Select some small pieces of moso bamboo, put them in a drying oven and dry them to dryness, the drying temperature is 120°C, and the drying time is 24 hours, put them into a pulverizer and grind them, pass the bamboo powder through a 60-mesh sieve, and set aside; Step 11: Prepare bamboo powder with water-soluble phenolic resin, water-soluble waterproof paint and pigments to make a viscous putty that is consistent with the surface color of the bamboo visa board, which is used to repair the unevenness that may occur during the sawing process of the bamboo visa board For the hole, after the repair is complete, place it for 30 minutes, and then scrape the putty with a scraper. 2. The method for processing corrosion-resistant high-strength bamboo visa boards according to claim 1, characterized in that: in step 5, the amount of glue applied to the side of the moso bamboo slices is 220-260g/m ² . 3. the processing method of the corrosion-resistant high-strength bamboo visa board according to claim 1, is characterized in that: the hot press that produces large sheet board use in step 5 must have side pressure device; Hot press temperature 100- 120°C, vertical pressure 1.0-1.4MPa, horizontal pressure 0.2-0.5MPa, hot pressing time 5-10 minutes. 4. The processing method of corrosion-resistant high-strength bamboo visa board according to claim 1, characterized in that: the amount of glue applied to the large board in step 6 is 280-360g/m ² , and the length × width of the bamboo square The thickness is 2560mm×500mm×300mm or 1320mm×500mm×300mm, the hot-pressing pressure of the bamboo square is 1.4-1.6MPa, the hot-pressing temperature is 100-120°C, and the hot-pressing time is 120-180 minutes. 5. The processing method of corrosion-resistant high-strength bamboo visa board according to claim 1, characterized in that: the storage conditions of the bamboo jigsaw board in step 7 are temperature 20-25°C and relative humidity 40-60%. 6. the processing method of the corrosion-resistant high-strength bamboo visa board according to claim 1, is characterized in that: the formula of water-soluble phenolic resin adhesive is that the mass ratio of phenol, formaldehyde, NaOH is 1 in the step 8,11: 3.1: 0.24, cured product content 49%, free formaldehyde content <0.153%, resin pH value 9.2. 7. The processing method of the corrosion-resistant high-strength bamboo visa board according to claim 1, is characterized in that: the alkali-free glass fiber cloth selected in the step 8 is glass fiber chopped strand mat or continuous strand mat; The phenolic resin impregnation amount of the fiber impregnated cloth is 10-30%. 8. The processing method of the corrosion-resistant high-strength bamboo visa board according to claim 1, characterized in that: the hot pressing pressure of the bamboo visa board in step 9 is 1.2-1.5MPa, and the hot pressing temperature is 135-150 ℃, hot pressing time 20-30 minutes. 9. The processing method of the corrosion-resistant high-strength bamboo visa board according to claim 1, characterized in that: the waterproof coating in step 11 is a water-soluble polyurethane waterproof coating, and the pigment is Sudan red. 10. a corrosion-resistant high-strength bamboo visa board processed by a method as claimed in claim 1.