CN201195330Y - Chinese fir thin board laminated material - Google Patents

Abstract

The utility model discloses a Chinese fir thin sawed plate laminated wood which comprises more than two layers of Chinese fir thin sawed plates which are assembled according to the direction along the grain, each layer of Chinese fir thin sawed plate is impregnated with mixed impregnated resins, and every two layers of Chinese fir thin sawed plate are glued together by hot pressure. A tested piece is processed and tested according to the requirements of GB 1935-91 wood compression strength parallel to grain test method, and then the tested piece is processed and tested according to the requirements of NASACR-174910, UDR-TR-85-45 tensile strength parallel to grain test method, the average tensile strength along the wood grain direction is bigger than 130 MPa, the average compression strength along the wood grain direction is bigger than 80 MPa, and young modulus along the wood grain direction is bigger than 18 GPa, therefore, the strength requirement of a wind power blade is fully satisfied.

Description

A kind of fir thin sawn laminated lumber

technical field

The utility model relates to a fir thin sawn board laminated material used for wind power generation blade composite materials.

Background technique

At present, the blades used for wind power generation are generally made of glass fiber reinforced plastic (referred to as FRP) composite materials. Although the manufacturing process of this material is mature, it also has the problem of high cost (100,000-200,000 yuan/ton), and the waste products of FRP are difficult to handle, not only difficult to burn, but also difficult to decompose. Lots of land. Therefore, it is necessary to develop a new low-cost, recyclable and environmentally friendly blade to replace the glass fiber reinforced plastic blade currently used in large quantities.

my country is a country rich in timber resources. Chinese fir is one of the main species of timber widely grown in southern my country. It has a wide range of sources, a large amount of timber storage, and relatively fast growth. The directional mechanical properties are good, but the cross-grain direction strength of fir is low, and the compressive strength along the grain direction is also relatively low. It can be considered to replace this expensive FRP composite material by reorganizing fir.

Patent application 200710178373.8 "Visual inspection and mechanical grading method of Chinese fir sapwood sapwood composite materials for wind power blades" discloses a grading method for Chinese fir rough slabs, through which the specifications of Chinese fir sapwood with a flexural elastic modulus greater than 12000Mpa can be classified plate.

Patent application 200710178853.4 "Manufacturing method of fir veneer laminated lumber" discloses a manufacturing method of fir veneer laminated lumber, through the steps of the method, recombined fir squares that meet the research requirements of this patent can be produced.

Utility model content

The technical problem to be solved by the utility model is to provide a thin sawn fir laminated wood used as a composite material for wind power blades, and the laminated wood can meet various strength requirements of wind power blades.

In order to solve the above-mentioned problems, the utility model provides a kind of fir thin sawn board laminated lumber comprising: more than 2 layers of fir thin sawn boards assembled according to the direction along the grain, each layer of fir thin sawn boards is impregnated with a mixed impregnating resin, and Each layer of sawn fir is glued together by hot pressing.

Preferably, each layer of fir sawn boards is more than two pieces, and the surfaces of two adjacent fir sawn boards are coated with a layer of glue, and the single-layered fir sawn boards are glued together by heating .

Preferably, the thin sawn fir board has a thickness of 2-4mm.

The utility model processes and tests the test piece according to the requirements of GB1935-91 test method for compressive strength along the grain of wood; then processes and tests the test piece according to the requirements of NASA CR-174910 and UDR-TR-85-45 test method for tensile strength along the grain. The average tensile strength along the wood grain direction is >130MPa, the average compressive strength along the wood grain direction is >80MPa, and the Young's modulus along the wood grain direction is >18GPa, fully meeting the strength requirements of wind power blades.

Description of drawings

Fig. 1 is the schematic diagram of single-layer fir thin sawn board;

Fig. 2 is the schematic diagram of forming blanks of Chinese fir thin-sawn laminated lumber;

Fig. 3 is the blank assembly diagram of graded Chinese fir glulam.

Detailed ways

As shown in Figure 2, the utility model comprises: multi-layer (Fig. 2 schematically shows 8 layers, but can be a larger number of layers, so that it can be convenient for further processing wind power generation blades in the future) according to the direction along the grain The fir thin saw board 1, each layer of the fir thin saw board 1 is impregnated with the mixed impregnating resin 3, and each layer of the fir thin saw board 1 is glued together by hot pressing. As shown in Figure 1, each layer of fir thin saw boards 1 is more than two pieces, and the surfaces of two adjacent fir thin saw boards 1 are coated with a layer of adhesive layer 2, and the single layer of thin saw boards is bonded by heating. 2 glued together. Chinese fir thin sawn board 1 thickness is 3mm.

The utility model carries out material selection and processing according to the following steps:

First carry out the grading of fir sapwood diameter-cut specification board according to patent application 200710178373.8, specifically comprise the following steps:

Step 1: select diameter more than 30 centimetres, trunk is straight, and the appearance is not defective (comprising rotten, crooked etc.) some of the new Chinese fir logging log;

Step 2: carry out " rice " font blanking to material selection;

Step 3: Saw the standard fir sapwood quarter-cut rough board, dry it in a drying kiln until the moisture content is lower than 12%, remove various wood defects, and finish it into 500mm×20mm×20mm (length×width×thickness) The standard slats are spare;

Step 4: By visual inspection, the selected rough plate meets the following requirements: straight texture, uniform material, annual ring width less than 2mm and uniform distribution, no growth defects and processing defects in appearance, and the number of "mountain" patterns formed on the radial surface is less than 2 and The angle with the plane greater than 75° is qualified.

Then make according to the preparation steps of patent application 200710178853.4, the concrete steps are:

Step 5: As shown in Figure 3, the Chinese fir is grouped into billets. During the billet grouping, the graded Chinese fir sapwood diameter-cut standard board 4 blanks should be ensured that the positions of the miter joints are staggered up and down, left and right, and the length direction is according to the miter angle. The miter joint is 2-6°, and the best miter angle is 3.81° (slope 1/15). The glulam glue is applied between the fir sapwood diameter-cut specification boards 4, and the adhesive uses two-component synthetic latex (LK-DN60) as the adhesive for the glulam, and the proportion is (weight percent): 70% to 90% of synthetic latex , the curing agent is 10 to 30%, and the preferred proportioning ratio is: LK-DN60: curing agent=100:15. The glue amount is 120-220g/m ² , the aging time is 5-15 minutes, the pressure is 5-15kgcm ² , the cold pressing time is 60-120 minutes; the best glue amount is 170g/m ² (single side) , the aging time is 10 minutes, the pressure is 10kg/cm ² , and the cold pressing time is 90 minutes. The structure of the prepared graded fir glulam wood square 5 is shown in Figure 3 .

Make according to the manufacturing steps of the present utility model, concrete steps are:

Step 6: After placing the cold-pressed fir glulam wood square for 24 hours, take out the sawn board 1 that is sawed in the radial direction and processed into a 3mm thick thin saw board 1 for later use, as shown in Figure 1.

Step 7: according to proportioning (percentage by weight): 618 epoxy resin 15～35%, SK3 epoxy resin 15～35%, phenolic resin 25～45% modulation impregnation resin; Preferred proportioning is: 618 epoxy resin : SK3 epoxy resin: 2124 phenolic resin=30:30:40; measure the solid content of the prepared epoxy mixed impregnating resin, then add diluent acetone to adjust the solid content of the epoxy mixed impregnating resin to 40%.

Step 8: Pour the prepared epoxy mixed impregnation resin into the impregnation tank, add fir thin saw boards, add heavy objects to completely immerse the fir thin saw boards in the impregnation resin, add 0.8MPa pressure impregnation, take out after 60 minutes and drain Dry until the glue on the surface of the thin saw board is no longer sticky, send the resin-impregnated thin saw board into the oven to dry, turn on the oven blower, set the oven temperature to 60°C, and the time is 120 minutes.

Step 9: impregnating the thin sawn boards that have been dried at low temperature to assemble the billets along the grain, the compression rate of the thin sawn boards is 55%, put the materials that have been assembled into a hot press for hot pressing, and heat press the top and bottom of the backing plate The lower two layers are coated with 800-1000 centipoise silicone oil, the hot-pressing temperature is 100-140°C, the pressure is 10-20Mpa, and the hot-pressing time is 60-120 minutes; For polysilicone oil, the hot pressing temperature is 120° C., the pressure is 15 MPa, and the time is 90 minutes. The manufactured thin-sawn laminated lumber of Chinese fir is shown in Figure 2.

Step 10: Take out the processed Chinese fir thin-sawn laminated lumber, place it after 24 hours, process and detect the test piece according to the requirements of GB1935-91 wood compressive strength test method along the grain; then press NASACR-174910, UDR-TR -85-45 According to the requirements of the tensile strength test method along the grain, process and test the specimen, the average tensile strength along the grain direction>130MPa, the average compressive strength along the grain direction>80MPa, Young's modulus along the grain direction Volume>18GPa.

Through the above steps, it is possible to conveniently mass-produce the thin-sawn laminated lumber of Chinese fir that meets the requirements of composite materials for wind power generation blades, thereby fully satisfying the requirement of using Chinese fir in large quantities for wind power generation blades.

In addition, in the above step 6, the thin sawn board is processed to 2-4 mm, and the test results can all meet the strength requirements of the step 10 test. Therefore, it also meets the requirements of materials processed into wind power generation blades.

In summary, the above are only preferred embodiments of the present utility model, and are not used to limit the scope of protection of the present utility model. Therefore, any modifications, equivalent replacements, Improvements and the like should all be included within the protection scope of the present utility model.

Claims (3)

1. the thin saw of a China fir plate laminated material is characterized in that, comprising: according to the thin saw of the China fir plate of rift grain direction assembly, the every layer of thin saw of China fir plate all is impregnated with the hybrid infusion resin, and by hot pressing that the thin saw of every layer of China fir plate is glued together more than 2 layers.

2. the thin saw of a kind of China fir as claimed in claim 1 plate laminated material, it is characterized in that, the thin saw of described every layer of China fir plate is more than two, scribbles one deck glue-line on the surface of the thin saw of two adjacent China firs plate, and by hot pressing that the thin saw of the China fir plate of individual layer is glued together.

3. the thin saw of a kind of China fir as claimed in claim 1 or 2 plate laminated material is characterized in that the thickness of the thin saw of described China fir plate is 2～4mm.

Images