CN101704256B - Method for manufacturing cold plasma modified single board quasi-artificial board - Google Patents

Method for manufacturing cold plasma modified single board quasi-artificial board Download PDF

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Publication number
CN101704256B
CN101704256B CN2009102135746A CN200910213574A CN101704256B CN 101704256 B CN101704256 B CN 101704256B CN 2009102135746 A CN2009102135746 A CN 2009102135746A CN 200910213574 A CN200910213574 A CN 200910213574A CN 101704256 B CN101704256 B CN 101704256B
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board
processing
cold plasma
hot pressing
vacuum
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CN2009102135746A
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Chinese (zh)
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CN101704256A (en
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周晓燕
汤丽娟
周定国
张小培
邵汉良
徐信武
梅长彤
潘明珠
郑菲
许娟
钱滢
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南京林业大学
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Abstract

The invention relates to a method for manufacturing cold plasma modified single board quasi-artificial board. The technique thereof is implemented by regulating water content of the single board to 5-8%, placing in a sample chamber of cold plasma modification equipments, vacuum pumping to 2-4Pa, pumping in oxygen, and regulating vacuum degree to 10-30Pa; starting a radio frequency power source, regulating processing power to 100-300W, and modifying the surface of the single board for 1-5min; turning off the oxygen flow control valve, pumping in ammonia, keeping vacuum degree at 50-80Pa, starting the radio frequency power source, regulating processing power to 100-300W, performing graft polymerization on the single board for 3-10min; coating urea resin on the surface of the single board, ageing, assembling and hot-pressing to manufacture into boards. The bonding strength of the product made of single boards modified by cold plasma can be improved by 5-25%, and the release amount of free formaldehyde is decreased by 10-30%. In addition, the method causes no pollution, and is simple in operation and strong in controllability.

Description

The manufacture method of cold plasma modified single board quasi-artificial board

Technical field

The present invention relates to a kind ofly, make the method for single board quasi-artificial board (comprising glued board, multi-layer solid wood composite floor base material and non-structure laminated veneer lumber) by cold plasma modified processing.Belong to wood-based plate manufacturing technology field.

Background technology

Since 21 century, China's Wood-based Panel Production is to increase by 20% speed develop rapidly every year.According to statistics, to the end of the year 2008, family surplus the existing big-and-middle-sized artificial board enterprise 6000, the gross annual output amount is first big countries of world's Wood-based Panel Production, consumption and foreign trade up to 9410 ten thousand steres.And in numerous wood-based panel products, the output of glued board and export volume occupy the first place all the time.Show that according to related data China's glued board output reached 3541 ten thousand steres in 2008, accounted for 37.63% of whole wood-based plate output.Product is found a good sale in more than 100 countries and regions, the world, and export volume reaches 718 ten thousand steres.The development of glued board industry has promoted to be the quick growth of the solid wooden compound floor industry of base material with the multi-plywood.The output of China's solid wooden compound floor in 2008 has reached 7,903 ten thousand square metres, accounts for 20.97% of whole timber floors.

Single board quasi-artificial board such as glued board, multi-layer solid wood composite floor base material and non-structure all are that log with a sizing level is a raw material with laminated veneer lumber, make veneer by rotary-cut, the artificial board of making through hot pressing at its surface coating urea-formaldehyde resin adhesive.Along with the enforcement of China's wildwood protected project, single board quasi-artificial board is produced used big footpath level log supply growing tension.The successful battalion of the quick growing species of trees (as poplar, China fir, Eucalyptus and pine etc.) plants and has alleviated the timber resources contradiction that supply falls short of demand greatly.Yet the quick growing species of trees has caused material loose because growth cycle is short, and institutional framework is inhomogeneous, and strength of wood is low, yielding problem, and this has brought technical difficulty for the production of single board quasi-artificial board.Especially the sheet material that bonding strength and dimensional stability is had high request, in the production normally by increasing the quality that the adhesive consumption guarantees product.As make its urea-formaldehyde glue consumption of multilayer poplar solid wooden compound floor base material and be generally 400~500g/m 2(two-sided) only is 280~300g/m and make common poplar plywood urea-formaldehyde glue consumption 2(two-sided).The increase of glue-spread helps improving the bonding strength of sheet material and the ability of resistance to deformation, but has also brought the problem that improves production cost and increase the sheet material free formaldehyde release simultaneously.

Plasma is a kind of high-octane material aggregation attitude, wherein contains atom, molecule, photon and the free radical isoreactivity particle of a large amount of electronics, ion, excitation state.Utilize plasma that material is handled the physical change that can cause material surface (as etching, desorb, sputter, inject, excite with ionization etc.) and chemical change (as oxidation, decomposition, crosslinked, polymerization and grafting etc.), to reach the purpose that changes material surface characteristic (comprising hydrophily, hydrophobicity, cohesive, anti-flammability, anti-corrosive properties, static electricity resistance and biocompatibility).Plasma can be divided into high-temperature plasma and low temperature plasma according to the size and the macroscopic property of constituent particle energy, low temperature plasma is divided into hot plasma (thermodynamical equilibrium) and cold plasma (non-equilibrium thermodynamics) again, wherein the energy of particle several thousand is spent the hundreds of thousands degree approximately in the hot plasma, needing to be generally used for the field of high-temperature operation, to prepare superfine powder etc. as magnetohydrodynamic generator, plasma welding, cutting, plasma smelting, plasma spray coating, plasma.The temperature of different particles is inequality in the cold plasma, wherein the temperature of electronics is spent the hundreds of thousands degree from several thousand, and the temperature of ion and room temperature are very nearly the same, Just because of this, it has important use to be worth, as is used for material surface is carried out modification and light source etc.

Summary of the invention

The objective of the invention is to handle, make the veneer surface obtain activation, improve the surface free energy and the wetability of veneer, help forming between veneer and the adhesive firm adhesion by Wooden veneer being carried out cold plasma.Can impel the crosslinked functional group of Lauxite in veneer surface introducing simultaneously, promote the curing of adhesive, improve the bonding strength of product, reduce the free formaldehyde release of product simultaneously.

Technical solution of the present invention: the processing step of this method is divided into successively,

(1) surface modification: after the veneer moisture content is adjusted to 5~8%, place cold plasma modified equipment sample chamber, vavuum pump is opened in the sealing sample room, is evacuated to the base vacuum of 2~4Pa, aerating oxygen then, and vacuum transferred to 10~30Pa.Start radio-frequency power supply, regulate processing power to 100~300W, sample indoor gas build-up of luminance, utilize radio frequency glow discharge to produce the oxygen cold plasma that contains high energy particles such as a large amount of electronics, ion and free radical, by these particles to the etching on veneer surface, excite, effect such as oxidation and decomposition, make its surface produce a large amount of active groups, significantly improved the surface free energy and the wetability of veneer, provide advantage for forming adhesion firm between veneer and the adhesive.Processing time is 1~5min.

(2) glycerol polymerization: after finishing surface modification treatment, close the oxygen flow control valve, feed ammonia, keep vacuum at 50~80Pa, start radio-frequency power supply, regulate processing power to 100~300W, sample indoor gas build-up of luminance, produce the active particle that produces after ammonia plasma treatment and the veneer surface modification and react, polymerization is deposited on the veneer surface, and introduced the crosslinked active group of a large amount of promotion urea-formaldehyde glues on the veneer surface (as-NH 2,-NH etc.).Simultaneously, these active groups also can react with the free formaldehyde in the adhesive, thereby have reduced the content of free formaldehyde in the sheet material.Processing time is 3~10min.

(3) be coated with glue glued adhesion: the veneer surface coating urea-formaldehyde resin adhesive after processing.Usually, the normal plywood glue-spread is 220~400g/m 2(two-sided), multilayer poplar solid wooden compound floor base material glue-spread is 300~500g/m 2(two-sided), non-structure is 250~400g/m with the laminated veneer lumber glue-spread 2(two-sided).Veneer is guaranteeing that product quality is up to state standards under the prerequisite of related request after cold plasma is handled, glue-spread can reduce 5~15% than conventional amount used.The veneer of gluing carries out assembly by the requirement of various product structures after ageing, make sheet material again after hot pressing.Heat pressing process is decided on various different product kinds, and hot pressing temperature is 105~120 ℃ usually, and hot pressing pressure is 1.0~1.4MPa, and hot pressing time is 40~80s/mm.

Advantage of the present invention: (1) effect is remarkable: its bonding strength raising rate of the single board quasi-artificial board product that veneer is made after cold plasma modified processing reaches 5~25%.The free formaldehyde release rate of descent of product reaches 10~30% simultaneously.Therefore, reach in properties of product under the prerequisite of relevant national standard requirement, can reduce the adhesive consumption significantly, thereby can reduce production costs, and make product environmental protection more.(2) pollution-free: this invention has proposed a kind of physical modification treatment technology, does not produce pollutants such as waste water, waste gas and waste residue, environment-protecting clean in the processing procedure.Meet the requirement of current industrial production energy-saving and emission-reduction.(3) easy and simple to handle, controllability is strong: can control treatment effect by adjusting treatment process according to the requirement of product.

The specific embodiment

Embodiment 1:

The board using poplar board moisture content transfers to 5%, places cold plasma modified equipment sample chamber, and vavuum pump is opened in the sealing sample room, is evacuated to the base vacuum of 2Pa, and aerating oxygen carries out modification and handles then.Running parameter: vacuum 10Pa.Processing power 100W, processing time 1min.Then, close the Oxygen Flow metered valve, feed ammonia and carry out the glycerol polymerization processing.Running parameter: vacuum 50Pa, processing power 100W, the processing time is 3min.With the veneer surface coating urea-formaldehyde resin adhesive after handling, glue-spread is 260g/m 2(two-sided) is pressed into normal plywood with the after heat of five layers of veneer assembly.Heat pressing process: hot pressing temperature: 120 ℃, hot pressing pressure: 1.0MPa, hot pressing time: 60s/mm.After testing, the bonding strength of sheet material increases by 6.78% with the sheet material that the veneer that is untreated is made under the same process condition, and free formaldehyde release descends 13.6%.

Embodiment 2:

The board using poplar board moisture content transfers to 6%, places cold plasma modified equipment sample chamber, and vavuum pump is opened in the sealing sample room, is evacuated to the base vacuum of 2Pa, and aerating oxygen carries out modification and handles then.Running parameter: vacuum 20Pa.Processing power 200W, processing time 3min.Then, close the Oxygen Flow metered valve, feed ammonia and carry out the glycerol polymerization processing.Running parameter: vacuum 60Pa, processing power 200W, the processing time is 6min.With the veneer surface coating urea-formaldehyde resin adhesive after handling, glue-spread is 250g/m 2(two-sided) is pressed into normal plywood with the after heat of five layers of veneer assembly.Heat pressing process: hot pressing temperature: 120 ℃, hot pressing pressure: 1.0MPa, hot pressing time: 60s/mm.After testing, the bonding strength of sheet material increases by 20.6% with the sheet material that the veneer that is untreated is made under the same process condition, and free formaldehyde release descends 25.5%.

Embodiment 3:

The board using poplar board moisture content transfers to 8%, places cold plasma modified equipment sample chamber, and vavuum pump is opened in the sealing sample room, is evacuated to the base vacuum of 4Pa, and aerating oxygen carries out modification and handles then.Running parameter: vacuum 30Pa.Processing power 300W, processing time 5min.Then, close the Oxygen Flow metered valve, feed ammonia and carry out the glycerol polymerization processing.Running parameter: vacuum 80Pa, processing power 300W, the processing time is 10min.With the veneer surface coating urea-formaldehyde resin adhesive after handling, glue-spread is 240g/m 2(two-sided) is pressed into normal plywood with the after heat of five layers of veneer assembly.Heat pressing process: hot pressing temperature: 120 ℃, hot pressing pressure: 1.0MPa, hot pressing time: 60s/mm.After testing, the bonding strength of sheet material increases by 18.7% with the sheet material that the veneer that is untreated is made under the same process condition, and free formaldehyde release descends 20.2%.

Claims (1)

1. the manufacture method of cold plasma modified Wooden veneer class wood-based plate is characterized in that the processing step of this method is divided into successively,
(1) surface modification: after the Wooden veneer moisture content is adjusted to 5~8%, place cold plasma modified equipment sample chamber, the sealing sample room, open vavuum pump, be evacuated to the base vacuum of 2~4Pa, aerating oxygen carries out modification processing, running parameter: vacuum 10~30Pa then, processing power 100~300W, the processing time is 1~5min;
(2) glycerol polymerization: after finishing surface modification treatment, close the oxygen flow control valve, feed ammonia and carry out the glycerol polymerization processing, running parameter: vacuum 50~80Pa, processing power 100~300W, the processing time is 3~10min;
(3) be coated with glue glued adhesion: the Wooden veneer surface coating urea-formaldehyde resin adhesive after processing, Wooden veneer is after cold plasma is handled, guaranteeing that product quality is up to state standards under the prerequisite of related request, glue-spread can reduce 5~15% than conventional amount used, the Wooden veneer of gluing is after ageing, assembly is carried out in requirement by various product structures, after hot pressing, make sheet material again, heat pressing process is decided on various different product kinds, hot pressing temperature is 105~120 ℃, hot pressing pressure is 1.0~1.4MPa, and hot pressing time is 40~80s/mm.
CN2009102135746A 2009-11-06 2009-11-06 Method for manufacturing cold plasma modified single board quasi-artificial board CN101704256B (en)

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CN101704256B true CN101704256B (en) 2011-12-28

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Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102259364A (en) * 2010-05-26 2011-11-30 朱斌 Wood drying and modification method
CN101941224B (en) * 2010-08-30 2013-09-18 南京林业大学 Method for improving bonding performance of woody single plate by utilizing normal pressure cold plasma
CN102198679B (en) * 2011-05-11 2014-03-26 南京林业大学 Method for reinforcing fast-growing floor board
CN106956338A (en) * 2016-01-12 2017-07-18 东北林业大学 A kind of method for improving the fire-retardant wood surface wetability of larch
CN106079012A (en) * 2016-06-21 2016-11-09 南京林业大学 A kind of method utilizing steam dielectric barrier discharge plasma to strengthen agricultural crop straw glue performance
CN106113208A (en) * 2016-06-21 2016-11-16 南京林业大学 A kind of method utilizing acrylic monomers dielectric barrier discharge plasma to strengthen agricultural crop straw glue performance
CN107139298B (en) * 2017-06-13 2018-12-07 浙江省林业科学研究院 A kind of manufacturing method of bamboo material surface load nano-titanium dioxide material
CN108199107B (en) * 2018-01-03 2020-02-18 殷衡 Method for recycling ternary battery positive electrode material by plasma technology
CN108748541A (en) * 2018-06-12 2018-11-06 阜南县创发工艺品有限公司 A kind of method of damp and hot compression-plasma pretreatment timber
CN109795003A (en) * 2019-02-27 2019-05-24 于海洋 A kind of method of the cold plasma modified processing bamboo wood of vacuum freeze drying-ultrasound-oxygen

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