Method for producing total-eucalyptus plywood by adopting weather-resistant composite urea resin

A technology of urea-formaldehyde resin and weather resistance, which is applied in the field of weather-resistant composite urea-formaldehyde resin to produce eucalyptus plywood. Reduce formaldehyde content, improve aging resistance, and whiten the color

Inactive Publication Date: 2017-01-11
南宁市林润木业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no literature report on the production of eucalyptus plywood with weather-resistant composite urea-formaldehyde resin as glue
At the same time, the current eucalyptus plywood is mainly used in aircraft, ships, trains, automobiles, buildings, and packaging boxes. It has a long service life and needs to undergo a long-term environmental damage test. 1. Phenolic glue has poor high temperature resistance and waterproof effect. Once water enters, it will cause glue opening, and it is easy to cause foaming and deformation due to water absorption and expansion; in addition, full eucalyptus plywood is also prone to non-wear resistance and scratches.

Method used

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  • Method for producing total-eucalyptus plywood by adopting weather-resistant composite urea resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] The method for producing full eucalyptus plywood by adopting weather-resistant composite urea-formaldehyde resin comprises the steps:

[0068] (1) Rotary slices of wood: Use a rotary cutter to cut eucalyptus into 1.5 mm thick slices to obtain eucalyptus veneers, and pick out unqualified boards with insect eyes, decay, and excessive defects;

[0069] (2) Veneer drying: Dry the eucalyptus veneer with a hot air stove, and control the moisture content of the veneer to be less than or equal to 10%;

[0070] (3) Glue coating: glue the eucalyptus veneer with a glue machine, and arrange 9 layers of glued eucalyptus veneers in a criss-cross pattern according to the wood texture structure, and glue them together to obtain a eucalyptus slab; The glue is a weather-resistant composite urea-formaldehyde resin, and the amount of glue on one side is 200g / m 2 ;

[0071] (4) Three times of cold pressing: the eucalyptus slab is cold pressed three times at a unit pressure of 0.8 MPa and ...

Embodiment 2

[0094] The method for producing full eucalyptus plywood by adopting weather-resistant composite urea-formaldehyde resin comprises the steps:

[0095] (1) Rotary slices of wood: Use a rotary cutter to cut eucalyptus into 1.5 mm thick slices to obtain eucalyptus veneers, and pick out unqualified boards with insect eyes, decay, and excessive defects;

[0096] (2) Veneer drying: Dry the eucalyptus veneer with a hot air stove, and control the moisture content of the veneer to be less than or equal to 10%;

[0097] (3) Gluing: Glue the eucalyptus veneers with a gluing machine, and arrange 11 layers of glued eucalyptus veneers in criss-cross layers according to the wood texture structure, and glue them together to obtain eucalyptus slabs; The glue is a weather-resistant composite urea-formaldehyde resin, and the amount of glue on one side is 220g / m 2 ;

[0098] (4) Three times of cold pressing: the eucalyptus slab is cold pressed three times at a unit pressure of 0.85 MPa and at ro...

Embodiment 3

[0121] The method for producing full eucalyptus plywood by adopting weather-resistant composite urea-formaldehyde resin comprises the steps:

[0122] (1) Rotary slices of wood: Use a rotary cutter to cut eucalyptus into 1.5 mm thick slices to obtain eucalyptus veneers, and pick out unqualified boards with insect eyes, decay, and excessive defects;

[0123] (2) Veneer drying: Dry the eucalyptus veneer with a hot air stove, and control the moisture content of the veneer to be less than or equal to 10%;

[0124] (3) Gluing: Glue the eucalyptus veneers with a gluing machine and arrange 13 layers of glued eucalyptus veneers criss-cross and layered according to the wood texture structure, and glue them together to get eucalyptus slabs; The glue is a weather-resistant composite urea-formaldehyde resin, and the amount of glue on one side is 230g / m 2 ;

[0125] (4) Three times of cold pressing: the eucalyptus slab is cold pressed three times at a unit pressure of 0.9 MPa and at room ...

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Abstract

The invention discloses a method for producing total-eucalyptus plywood by adopting weather-resistant composite urea resin. The method comprises the following steps: rotatably cutting wood boards; drying each board; gluing; performing cold pressing for three times; stewing and conditioning; performing hot pressing for three times; cooling and conditioning; determining the thickness of a board blank and sanding the board blank. The key points of the production method disclosed by the invention are that melamine modified urea resin is adopted as a main material of an adhesive and is added with oxidized starch to form a viscous compound, polyvinyl alcohol is taken as a toughening agent, polyisocyanate is taken as a curing agent, isobutyl triethoxy silane is taken as a bridging agent, phenolated lignin is taken as a formaldehyde catcher, and moreover an antioxidant and an ultraviolet absorbent are also added to prepare the weather-resistant composite urea resin; the composite urea resin has the advantages of low formaldehyde residual volume and good weather resistance. The total-eucalyptus plywood produced by the method disclosed by the invention is excellent in weather resistance and is relatively high in environmental disruption tolerance.

Description

technical field [0001] The invention belongs to the field of artificial board manufacture, in particular to a method for producing full eucalyptus plywood by using weather-resistant composite urea-formaldehyde resin. Background technique [0002] Plywood is an important type of wood-based panel. The plywood currently on the market is a three-layer or multi-layer board-like material that is cut into veneers by wood segments or sliced ​​into thin wood by wood squares, and then glued with adhesives. It is usually made of odd-numbered veneers, and the fiber directions of adjacent veneers are glued perpendicular to each other; plywood is widely used in architectural decoration, furniture manufacturing, wooden door manufacturing, Floor manufacturing, marine and vehicle interior finishing. [0003] The production of plywood is mostly made of fast-growing eucalyptus wood sheets pressed together by adhesives. Eucalyptus wood has a dense structure and hard material, and the laminate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/04B27D1/08B27D5/00B32B37/06B32B37/10C09J161/32C09J103/10C09J11/04C09J11/06C09J11/08
CPCB27D1/04B27D1/08B27D5/00B32B37/06B32B37/10C08B31/18C08K2201/011C08L2201/08C08L2205/035C09J11/04C09J11/06C09J11/08C09J161/32C08L3/10C08L29/04C08L93/04C08L97/00C08K2003/2241C08K5/13C08K5/5419
Inventor 王飞虎
Owner 南宁市林润木业有限公司
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