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Method for producing total-eucalyptus plywood by adopting moisture-proof composite urea resin

A urea-formaldehyde resin and plywood technology, which is applied in the joining of wooden veneers, the manufacture of veneers, and aldehyde/ketone condensation polymer adhesives, etc., can solve the problem of unacceptable cost and difficulty in releasing formaldehyde to meet the standard of formaldehyde emission. , increase the amount of glue, etc., to achieve the effect of white color, not easy to arch and deform, and increase viscosity

Inactive Publication Date: 2017-01-11
南宁市创锦胶合板有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the amount of sizing increases, and the formaldehyde emission is difficult to meet the national standard for formaldehyde emission
Formaldehyde-free adhesive is used, and the cost is unacceptable

Method used

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  • Method for producing total-eucalyptus plywood by adopting moisture-proof composite urea resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The method for producing full eucalyptus plywood by adopting moisture-proof composite urea-formaldehyde resin comprises the steps:

[0064] (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;

[0065] (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%;

[0066] (3) Gluing: Glue the eucalyptus veneer with a gluing machine, arrange 9 layers of glued eucalyptus veneer criss-cross and layered according to the wood texture structure, and glue them together to obtain a eucalyptus slab; The glue is a moisture-proof composite urea-formaldehyde resin, and the amount of glue on one side is 200g / m 2 ;

[0067] (4) Three times of cold pressing: the eucalyptus slab is cold pressed three times at a unit pressure of 0.8 MPa and at room temperat...

Embodiment 2

[0089] The method for producing full eucalyptus plywood by adopting moisture-proof composite urea-formaldehyde resin comprises the steps:

[0090] (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;

[0091] (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%;

[0092] (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 moisture-proof composite urea-formaldehyde resin, and the amount of glue on one side is 220g / m 2 ;

[0093] (4) Three times of cold pressing: the eucalyptus slab is cold pressed three times at a unit pressure of 0.85 MPa and at room tem...

Embodiment 3

[0115] The method for producing full eucalyptus plywood by adopting moisture-proof composite urea-formaldehyde resin comprises the steps:

[0116] (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;

[0117] (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%;

[0118] (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 moisture-proof composite urea-formaldehyde resin, and the amount of glue on one side is 230g / m 2 ;

[0119] (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 temper...

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Abstract

The invention discloses a method for producing total-eucalyptus plywood by adopting moisture-proof 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, magnesium oxide is taken as an antiaging agent, hexamine and triglycidyl isocyanurate are taken as a curing agent, isobutyl triethoxy silane is taken as a bridging agent, phenolated lignin is taken as a formaldehyde catcher and aliphatic polyurethane acrylate is taken as a moisture-proof agent to prepare the composite urea resin; the composite urea resin has the advantages of being low in formaldehyde residual volume, good in water resistance and good in moisture resistance; therefore, the produced total-eucalyptus plywood is low in formaldehyde residual volume, hard to expand after absorbing water and hard to arch and deform, and a wear-resistant layer is hard to damage.

Description

technical field [0001] The invention belongs to the field of artificial board manufacture, in particular to a method for producing whole eucalyptus plywood by using moisture-proof 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 laminated ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B27D1/06B27D1/08B27D1/10B27G11/00B27L5/00C09J11/04C09J11/06C09J11/08C09J161/32
CPCB27L5/00B27D1/06B27D1/08B27D1/10B27G11/00C09J11/04C09J11/06C09J11/08C09J161/32
Inventor 王飞虎胡海强陆显寿潘新革钟崇石
Owner 南宁市创锦胶合板有限责任公司
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