Preparation method of moisture-proof and flame-retardant plywood

A technology for plywood and veneer, applied in the field of plywood, can solve the problems of high formaldehyde content, poor anti-mildew effect, poor flame retardancy, etc., and achieve the effects of high formaldehyde removal rate, good oil resistance, and good sound insulation performance.

Active Publication Date: 2019-10-18
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for preparing moisture-proof and flame-retardant plywood, which solves the technical problems of high formaldehyde content, poor anti-mildew effect, poor flame retardancy, poor water resistance and low strength in existing plywood

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method of moisture-proof and flame-retardant plywood, the steps are:

[0031] Step 1: Heat and dry a group of veneers or veneers at 60°C to a moisture content of 8%, and place the dried veneers or veneers in selenous acid with a mass concentration of 8mg / L at 40°C Soaked in sodium solution for 2 hours, then ultrasonicated at 31KHz for 30 minutes, and then freeze-dried at -40°C to a moisture content of 6%. The veneer is made of beech, eucalyptus, cypress, oak, rosewood and cherry Segment peeling is cut into 0.8mm thick, and described veneer is sliced ​​into 0.8mm thick by camphor wood side, birch side, ash wood side, Shuiqinggang wood side, elm side and walnut side;

[0032] Step 2: Mix 100 parts of phenolic resin adhesive, 2 parts of chitin, 1 part of tourmaline powder, 3 parts of ammonium sulfate, 2 parts of phenol, 3.5 parts of diethylenetriamine, and 0.5 parts of tackifier polyvinyl alcohol according to the ratio of parts by mass. 5 parts of corn starc...

Embodiment 2

[0043] A preparation method of moisture-proof and flame-retardant plywood, the steps are:

[0044] Step 1: Heat and dry a group of veneers or veneers at 70°C to a moisture content of 14%, place the dried veneers or veneers in selenous acid with a mass concentration of 10mg / L at 50°C Soaked in sodium solution for 3 hours, then ultrasonicated at 33KHz for 40 minutes, and then freeze-dried at -40°C to a moisture content of 10%. The veneer is made of beech, eucalyptus, cypress, oak, rosewood and cherry Segment peeling is cut into 1.2mm thick, and described veneer is sliced ​​into 1.2mm thick by camphor wood side, birch side, ash wood side, Shuiqinggang wood side, elm side and walnut side;

[0045] The second step: mix 100 parts of phenolic resin adhesive, 6 parts of chitin, 5 parts of tourmaline powder, 5 parts of ammonium sulfate, 4 parts of phenol, 4.5 parts of diethylenetriamine, and 2.5 parts of tackifier polyvinyl alcohol according to the ratio of parts by mass. 7 parts of c...

Embodiment 3

[0056] A preparation method of moisture-proof and flame-retardant plywood, the steps are:

[0057] Step 1: Heat and dry a group of veneers or veneers at 65°C to a moisture content of 11%, and place the dried veneers or veneers in selenous acid with a mass concentration of 9mg / L at 45°C Soak in sodium solution for 2.5h, then ultrasonic at 32KHz for 35min, and then freeze-dry at -40°C until the water content is 8%. The wood section is rotary cut into 1mm thick, and described veneer is sliced ​​into 1mm thick by camphor wood square, birch square, ash wood square, water green gang wood square, elm square and walnut square;

[0058] The second step: mix 100 parts of phenolic resin adhesive, 4 parts of chitin, 3 parts of tourmaline powder, 4 parts of ammonium sulfate, 3 parts of phenol, 4 parts of diethylenetriamine, and 1.5 parts of tackifier polyvinyl alcohol according to the ratio of parts by mass. 6 parts of cornstarch slurry, 20 parts of curing agent ammonium chloride, 0.8 par...

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Abstract

The invention discloses a preparation method of a moisture-proof and flame-retardant plywood. The method includes: drying a set of veneers or a set of sliced veneers, then coating adjacent veneers orsliced veneers with an adhesive to prepare a slab, conducting cold pressing and hot pressing on the slab, and then performing shearing, edge sawing, surface finishing, sanding and polishing, and thenspraying primer and top coat. The product has bonding strength of 50-70MPa and a mould inhibition rate of 78.4-83.6%, accords with the GB50222 "fire prevention code for interior decoration design of buildings", meets the requirements of B1-C flame retardant grade, the inner flame tip height in 20s is 17-84mm, and the paint film hardness is 2-4H.

Description

technical field [0001] The invention relates to the technical field of plywood, in particular to a preparation method of moisture-proof and flame-retardant plywood. Background technique [0002] Plywood is a three-layer or multi-layer board-like material that is made of wood sections that are peeled into veneers or sliced ​​into thin wood, and then glued with adhesives. Usually, odd-numbered veneers are used, and adjacent layers of veneers are used. The fiber directions are glued perpendicular to each other. [0003] Plywood is one of the commonly used materials for furniture, and it is one of the three major boards of wood-based panels. It can also be used for aircraft, ships, trains, automobiles, buildings and packaging boxes. A group of veneers are usually assembled and glued together according to the direction of the wood grain of adjacent layers perpendicular to each other. Usually, the surface board and inner layer board are symmetrically arranged on both sides of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B21/13B32B7/12B32B37/06B32B37/10B32B37/12C09J161/06C09J161/24C09J161/28C09J4/06C09J4/02C09J11/04C09J11/06C09J11/08C09D4/06C09D4/02C09D7/61C09D7/63C09D7/65C09D5/18C09D5/14
CPCB32B7/12B32B21/13B32B37/06B32B37/10B32B37/12C08K2003/387C08L2201/02C08L2205/035C09D4/06C09D5/002C09D5/14C09D5/18C09J4/06C09J11/04C09J11/06C09J11/08C09J161/06C09J161/24C09J161/28C09D7/61C09D7/63C09D7/65C08L5/08C08L3/02C08L97/005C08K13/02C08K3/08C08K5/5419
Inventor 那斌尚征帆张杰徐兆军郭晓磊
Owner NANJING FORESTRY UNIV
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