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Preparation method of medium density fiberboard based on soybean protein adhesive

A soybean protein, medium density technology, applied in the preparation of animal glue or gelatin, protein adhesives, adhesives, etc., can solve the problems of high cost, high formaldehyde emission, low strength, etc., to achieve uniform density, simple process, the effect of industrialization

Active Publication Date: 2017-04-12
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical problem to be solved: In order to solve the disadvantages of high cost, low strength and high formaldehyde emission of MDF in the prior art

Method used

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  • Preparation method of medium density fiberboard based on soybean protein adhesive
  • Preparation method of medium density fiberboard based on soybean protein adhesive
  • Preparation method of medium density fiberboard based on soybean protein adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Put the mixed fiber into the blender and stir, and at the same time, spray the glue prepared by blending the modifier boric acid and the crosslinking agent polyamide polyamine epichlorohydrin according to the mass ratio of 1:1 into the blender. 2% of the fiber mass, continue to stir and heat and dry at 80°C for 2 minutes, then add soybean protein powder accounting for 13.2% of the mixed fiber mass, continue to stir evenly, and then discharge. Spread the mixed material evenly into the mold frame of the required specification, give a pressure of 2MPa, and pre-press it into a slab. Then hot-press the pre-formed slab with a flat vulcanizer at 100°C. The hot-pressing process is: first increase the pressure to 10MPa within 10s, and keep the pressure for 20s; reduce the pressure to 4.0MPa, and keep the pressure for 20-250s; 50s Internally boost the pressure to 4.0MPa, hold the pressure for 50s; reduce the pressure to 3.0Mpa, hold the pressure for 100s, and the hot pressing end...

Embodiment 2

[0031] The operation steps are the same as in Example 1, wherein the mass ratio of the modifier to the crosslinking agent becomes 1:30, the mass percentage of the soybean protein adhesive solution in the mixed fiber becomes 5.7%, and the soybean protein powder accounts for 5.7% of the mixed fiber. The mass percentage is changed to 8.9%, the heating and drying temperature is changed to 60°C, the drying time is changed to 4min, the pre-pressing pressure is changed to 1MPa, the hot-pressing temperature is changed to 150°C, and the hot-pressing process is as follows: first, the pressure is raised to 8.0MPa within 20s , keep the pressure for 15s; reduce the pressure to 3.0MPa, keep the pressure for 20s; increase the pressure to 3.0MPa within 50s, keep the pressure for 80s; step down to 2.0Mpa, keep the pressure for 80s, and the hot pressing ends; after the board is out, cooled, sawed Edge, sanding and other steps to produce medium density fiberboard. Finally, the quality of the pre...

Embodiment 3

[0033] The operation steps are the same as in Example 1, wherein the mass ratio of the modifier to the crosslinking agent is changed to 1:30, the mass percentage of the soybean protein adhesive solution in the mixed fiber is changed to 8%, and the soybean protein powder accounts for the mixed fiber. The mass percentage is changed to 15%, the heating and drying temperature is changed to 60°C, the drying time is changed to 4min, the pre-pressing pressure is changed to 1MPa, the hot-pressing temperature is changed to 200°C, and the hot-pressing process is as follows: first boost the pressure to 8.0MPa within 20s , keep the pressure for 15s; reduce the pressure to 3.0MPa, keep the pressure for 20s; increase the pressure to 3.0MPa within 50s, keep the pressure for 80s; step down to 2.0Mpa, keep the pressure for 80s, and the hot pressing ends; after the board is out, cooled, sawed Edge, sanding and other steps to produce medium density fiberboard. Finally, the quality of the prepare...

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Abstract

The invention discloses a preparation method of a soybean-protein-adhesive-based medium-density fiberboard, which comprises the following steps: adding a certain amount of self-made soybean protein adhesive solution into mixed fibers with the water content of less than 30% and the particle size of 10-600 meshes, stirring uniformly, drying by heating for some time, adding soybean protein powder, continuing stirring for some time, discharging, paving, prepressing into a plate blank, sending the plate blank into a flat vulcanizing machine, carrying out hot pressing according to a certain hot pressing technique, cooling, sawing the edges, sanding and the like to obtain the medium-density fiberboard. The soybean protein adhesive is a zero-formaldehyde wood adhesive, and has the advantages of no free formaldehyde or any other toxic gas, high safety and environment protection. The prepared fiberboard has the advantages of moderate density, favorable physical properties and favorable mechanical properties. The density is 0.65-0.80 g / cm<3>, the thickness expansion ratio after 24-hour water absorption is less than 15%, the internal bonding strength is greater than 0.4 MPa, and the formaldehyde release amount is much better than national standard Grade E0 (at most 5 mg / 100g).

Description

technical field [0001] The invention relates to a method for preparing a medium density fiberboard based on a soybean protein adhesive, in particular to a method for preparing a self-made soybean protein adhesive, and belongs to the field of wood-based panel manufacturing. Background technique [0002] Medium-density fiberboard (MDF) is a kind of wood-based panel, which mainly uses plant fiber or wood fiber as the main raw material, after fiber separation, material preparation, sizing, drying, paving, pre-pressing, A kind of density between 0.65 ~ 0.80g / cm made by hot pressing, quality inspection and other processes 3 between the plates. Medium density fiberboard was successfully developed and put into production in the United States in the late 1960s. Compared with other boards, MDF has superior performance, not only has uniform internal structure, moderate density, light weight and high strength, good dimensional stability, and smooth surface. series features, and high w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J189/00C09J11/04C09J11/08B27N3/04
Inventor 许玉芝储富祥王春鹏王利军胡岚方南静娅
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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