CN103358385B - Method for producing non-formaldehyde environment-friendly particle boards by utilizing alkali lignin as binder - Google Patents
Method for producing non-formaldehyde environment-friendly particle boards by utilizing alkali lignin as binder Download PDFInfo
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- CN103358385B CN103358385B CN201210096064.7A CN201210096064A CN103358385B CN 103358385 B CN103358385 B CN 103358385B CN 201210096064 A CN201210096064 A CN 201210096064A CN 103358385 B CN103358385 B CN 103358385B
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- alkali lignin
- wood shavings
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Abstract
The invention belongs to the field of boards or packing materials, and particularly relates to a method for producing non-formaldehyde environment-friendly particle boards by means of hot press molding with stalks as raw materials and alkali lignin as a binder. The method for producing the particle boards includes steps of producing wood shavings by lignocellulose materials and activating with alkali added; adding alkali lignin solution, mixing uniformly with a certain water content maintained, and prepressing to produce sheets with certain thickness; applying the alkali lignin solution onto surfaces of the sheets secondarily by a spraying process, overlapping the sheets layer by layer, and finally performing hot pressing molding. The binding effect of the alkali lignin at high temperature is utilized to substitute for the conventional binders to assist in hot press molding of the lingocellulose materials, so that the problem of formaldehyde gas pollution caused by use of the conventional binders is solved completely. Since the alkali lignin is low-cost in use, production cost of hot press molding of the boards is reduced and economical benefit of the particle boards is increased.
Description
Technical field
The invention belongs to particieboard preparation field, is particularly raw material with lignocellulosic, with alkali lignin be adhesive by hot-forming preparation high strength without aldehyde particieboard method.
Background technology
Particieboard mainly utilizes timber or other ligno-cellulosic materials to be raw material, is processed into wood shavings particle, adds a certain amount of adhesive, the artificial board suppressed under certain temperature and pressure.Particieboard can make full use of the raw material such as agricultural crop straw or wood machining residues, for our country of inadequate forest resources, development particieboard is even more important, as patent CN1103348, CN101244580, CN1412092 just propose the method utilizing reed, reed grass and agricultural crop straw hot pressing particieboard respectively.But use at present at the adhesive that particieboard manufacture process is added and more be still Lauxite and phenolic resins etc. from the macromolecule resin synthesized by non-renewable petroleum resources, along with rising steadily of petroleum resources price, the cost of particieboard manufacture also constantly rises, finding utilizes renewable resource petroleum replacing product as the raw material preparing adhesive, has become the important development direction that particieboard manufactures.There is the problem of release free formaldehyde in adhesive made of synthetic resin simultaneously, pollutes indoor environment, be detrimental to health.Along with the rising that country is realized the further requirement of free formaldehyde release standard and health of people, in synthetic adhesive, burst size of methanal exceeds standard also becomes a bottleneck problem of restriction particieboard development.
In order to solve above-mentioned particieboard adhesive Problems existing and the searching space for sustainable development for particieboard industry, according to the psychology of modern's back to nature, the particieboard of preparing of natural adhesive is utilized to become main research direction, as patent CN101469257 proposes a kind of synthetic method of soybean albumen adhesive, patent CN101760148A proposes the method utilizing cornstarch as adhesive, and patent CN101402833 reports and utilizes shitosan and aldehydes matter normal temperature under the catalysis of laccase to prepare the method for wood-based plate.But the manufacture cost of material of above-mentioned natural adhesive is higher, intensity is lower, water resistance is poor, be easier to aging and be subject to microbial contamination, the particieboard causing natural adhesive to be prepared advantage compared with traditional particieboard is not obvious, and this is also that natural adhesive delays in particieboard field fast-developing major reason.
Lignin is one of three large constituents of ligno-cellulosic materials, its Main Function in plant is exactly be plant intensity and degeneration-resistant, simultaneously lignin is by the hydrophobic high polymer of phenylpropyl alcohol alkane monomer structure by ehter bond or C―C bond formation, have good waterproof action, the intensity utilizing protein or polysaccharose substance to bring as adhesive is low, water resistance is poor and be subject to the shortcomings such as microbial contamination therefore to utilize lignin can solve preferably as adhesive.Alkali lignin is the important by-products of soda pulping process, mainly exists in papermaking wastewater, is precipitated by acid out, just can isolate the higher alkali lignin of purity, and its cost is low compared with other natural glues.Patent CN101492522, CN10135812 and CN101942068A are proposed the preparation method of alkali lignin modified phenolic resin, but in these patents, alkali lignin can only Some substitute phenol and formaldehyde condensation, therefore this adhesive major part is from fossil resources, also there is Form aldehyde release problem simultaneously.Patent CN102248572A proposes and directly utilizes black liquid to prepare the method for particieboard as adhesive, but due to papermaking wastewater complicated component, except lignin, also have a large amount of hemicellulose degradation things, easily cause pressing plate effect to there is unstable and microbiological contamination.The alkali lignin that acid out is separated from black liquid, sugar content and content of ashes all lower, activity group content is high, can play dehydration condensation, form similar adhesive action effect under high temperature action with the active group in the ligno-cellulosic materials of overactivation and lignin itself.The present invention directly utilizes alkali lignin adhesive action at high temperature to substitute traditional adhesive to carry out heating platen to ligno-cellulosic materials, thoroughly solve the formaldehyde gas pollution problem of traditional adhesive, the use of relatively inexpensive alkali lignin simultaneously reduces the production cost of pressing plate, improves the economic benefit of particieboard.
Summary of the invention
Main purpose of the present invention is the lignocellulosic shavings raw material utilizing alkaline process to activate, and setting up with alkali lignin is adhesive, by the method for certain temperature and pressure hot pressing particieboard.This particieboard preparation method is by alkaline process activation wood particle raw material, the adhesive action utilizing alkali lignin at high temperature to be formed with lignin in raw material and carbohydrate generation condensation reaction instead of the adhesive action of traditional Lauxite or phenolic resins, thoroughly solve the formaldehyde gas release pollution problem of traditional adhesive, use relatively inexpensive alkali lignin to reduce the production cost of pressing plate simultaneously, improve economic benefit prepared by particieboard.
Key step of the present invention is as follows:
(1) manufacture of lignocellulosic material wood shavings, particle:
The raw material of wood shavings can be wood machining residues, agricultural crop straw etc., grows into 5-20mm by shaving machine or pulverizer preparation, wide for 3-10mm, thickness be the particle of 2-5mm.
(2) wood shavings material step (1) obtained adds 1-2%NaOH solution boiling activation with quality solid-to-liquid ratio 1: 8-10, and temperature is 80 ~ 100 DEG C, and the time is 25 ~ 30min, squeezes out aqueous slkali, material drying after boiling completes.
(3) wood shavings material even application concentration step (2) obtained is the alkali lignin concentrated solution of 5-10%, and quantity for spray is 1: 0.5-1, and the addition of alkali lignin is 5-10%, and control water content is 30-50%.
(4) wood shavings material prefabricating plate step (3) obtained, pressure 0.1-0.2MPa, temperature controls at 90-110 DEG C, and the time is 5min, is pressed into the thin plate of thickness 8-10mm in advance.
(5) secondary applies the wood shavings thin plate top layer that alkali lignin solution obtains in step (4) precompressed, quantity for spray is 0.5-1.5%, control water content is 20-30%, multi-layered sheet intersection is stacked, particieboard is prepared by hot-press method, hot pressing temperature is 170-185 DEG C, and the time is 8-10min, and pressure is 0.8-1.2MPa.
The advantage that the present invention has: alkali lignin is the main component of waste liquor in alkaline process paper making, wide material sources, for adhesive made of synthetic resin, is that belong to can in production-goods source, relative low price, simultaneously not containing Form aldehyde release problem.Therefore by alkali lignin as production of adhesive particieboard, turn waste into wealth, there is good economic worth and environment protection significance.
Detailed description of the invention
Embodiment 1: by pulverizer by corn straw smashing, collects crushed material, adds 1%NaOH solution in 80 DEG C of boiling 30min, squeeze out aqueous slkali with quality solid-to-liquid ratio 1: 10, and after collecting alkali activation, wood shavings material is dried.Next in wood shavings material, add 5% alkali lignin solution, mixing all with, solid-to-liquid ratio is 1: 1, and now material moisture is about 75%, and the water content of drying to material is 35%.
Mated formation by shavings raw material after drying and carry out precompressed on hot press, the object of precompressed eliminates internal stress and reduces water content, and lignin is fully contacted with shavings raw material.The pressure of precompressed is 0.2MPa, and temperature is 90 DEG C, and the time is 5min, is pressed into the thin plate that thickness is 8mm in advance.The intensity of particieboard can be improved by secondary applying glue before pressing plate.The alkali lignin solution of the even application 5% again of thin plate top layer after the prepressing, controlling water content is 25%, and multi-layered sheet intersected and stack, prepare particieboard by hot-press method, hot pressing temperature is 185 DEG C, and the time is 8min, and pressure is 1.0MPa.
Embodiment 2: by pulverizer by corn straw smashing, collects crushed material, adds 2%NaOH solution in 100 DEG C of boiling 25min, squeeze out aqueous slkali with quality solid-to-liquid ratio 1: 8, and after collecting alkali activation, wood shavings material is dried.Next in wood shavings material, add 10% alkali lignin solution, mixing all with, solid-to-liquid ratio is 1: 1, and the water content of drying to material is 40%.
Mated formation by shavings raw material after drying and carry out precompressed on hot press, the object of precompressed eliminates internal stress and reduces water content, and lignin is fully contacted with shavings raw material.The pressure of precompressed is 0.1MPa, and temperature is 110 DEG C, and the time is 5min, is pressed into the thin plate that thickness is 10mm in advance.The intensity of particieboard can be improved by secondary applying glue before pressing plate.The alkali lignin solution of the even application 5% again of thin plate top layer after the prepressing, controlling water content is 20%, and multi-layered sheet intersected and stack, prepare particieboard by hot-press method, hot pressing temperature is 180 DEG C, and the time is 10min, and pressure is 1.2MPa.
Embodiment 3: pulverized by straw by pulverizer, is collected crushed material, adds 2%NaOH solution in 90 DEG C of boiling 25min, squeeze out aqueous slkali with quality solid-to-liquid ratio 1: 8, collects the rear wood shavings material of alkali activation.Next in wood shavings material, add 5% alkali lignin solution, mixing all with, solid-to-liquid ratio is 1: 1, and now material moisture is about 80%, and the water content of drying to material is 30%.
Mated formation by shavings raw material after drying and carry out precompressed on hot press, the object of precompressed eliminates internal stress and reduces water content, and lignin is fully contacted with shavings raw material.The pressure of precompressed is 0.1MPa, and temperature is 110 DEG C, and the time is 5min, is pressed into the thin plate that thickness is 5mm in advance.The intensity of particieboard can be improved by secondary applying glue before pressing plate.The alkali lignin solution of the even application 5% again of thin plate top layer after the prepressing, controlling water content is 30%, and multi-layered sheet intersected and stack, prepare particieboard by hot-press method, hot pressing temperature is 170 DEG C, and the time is 10min, and pressure is 1.2MPa.
Embodiment 4: with medium density fibre board (MDF) industrial wood waste for raw material, adds 10% alkali lignin solution, Homogeneous phase mixing, and solid-to-liquid ratio is 1: 0.8, and now material moisture is about 40%.To mat formation with the mixed uniformly shavings raw material of lignin and carry out hot pressing at hot press, be 90 DEG C in temperature, time pressure is 0.2MPa, after maintaining 5min, again increase the temperature to 175 DEG C, and improve pressure after temperature arrives to 0.8MPa, maintain 8min.
Claims (1)
1. with alkali lignin be adhesive without an aldehyde environmental protection particieboard preparation method, described method comprises the following steps:
The manufacture of a lignocellulosic material wood shavings, particle:
The raw material of wood shavings is wood machining residues or agricultural crop straw, grows into 5-20mm by shaving machine or pulverizer preparation, wide for 3-10mm, thickness be the particle of 2-5mm;
The wood shavings material that step a obtains by b adds 1-2%NaOH solution boiling activation with quality solid-to-liquid ratio 1:8-10, and temperature is 80 ~ 100 DEG C, and the time is 25 ~ 30min, squeezes out aqueous slkali, material drying after boiling completes;
The wood shavings material even application concentration that step b obtains by c is the alkali lignin concentrated solution of 5-10%, and spraying solid-to-liquid ratio is 1:0.5-1, and control water content is 30-50%;
The wood shavings material that step c obtains by d is pressed into plate in advance, pressure 0.1-0.2MPa, and temperature controls at 90-110 DEG C, and the time is 5min, is pressed into the thin plate of thickness 5-10mm in advance;
The wood shavings thin plate top layer that e applies alkali lignin solution and obtains in steps d precompressed for bis-times, quantity for spray is 0.5-1.5%, control water content is 20-30%, multi-layered sheet intersection is stacked, particieboard is prepared by hot-press method, hot pressing temperature is 170-185 DEG C, and the time is 8-10min, and pressure is 0.8-1.2MPa.
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| CN201210096064.7A CN103358385B (en) | 2012-04-01 | 2012-04-01 | Method for producing non-formaldehyde environment-friendly particle boards by utilizing alkali lignin as binder |
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| CN201210096064.7A CN103358385B (en) | 2012-04-01 | 2012-04-01 | Method for producing non-formaldehyde environment-friendly particle boards by utilizing alkali lignin as binder |
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| CN103358385B true CN103358385B (en) | 2015-07-01 |
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| CN105235046B (en) * | 2015-09-21 | 2017-11-10 | 昆明理工大学 | A kind of method with cow dung dry process fiberboard |
| CN110281341B (en) * | 2019-06-28 | 2020-03-06 | 北京林业大学 | Formaldehyde-free medium-high density board capable of deeply decorating surface and manufacturing method thereof |
| CN112720769A (en) * | 2020-12-25 | 2021-04-30 | 浙江农林大学 | Preparation method of environment-friendly high-strength wood fiber-based composite material |
| CN114016323A (en) * | 2021-09-27 | 2022-02-08 | 武汉轻工大学 | Preparation method and application of biodegradable cellulose paper with lignin as adhesive |
| CN115635555B (en) * | 2022-10-31 | 2023-08-01 | 中南林业科技大学 | Preparation method of environment-friendly high-strength wood composite material |
| CN115781858B (en) * | 2023-02-08 | 2023-05-12 | 中国林业科学研究院林产化学工业研究所 | E (E) NF Preparation method of graded lignan-based particle board |
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| CN101618565A (en) * | 2009-04-28 | 2010-01-06 | 王勇 | Manufacture method of environment-friendly wood substrate composite material |
| CN102179856A (en) * | 2011-04-07 | 2011-09-14 | 云南工业大麻股份有限公司 | High-intensity shaving board and manufacturing method thereof |
| CN102248572A (en) * | 2011-07-19 | 2011-11-23 | 中南林业科技大学 | Method for manufacturing high-strength environmentally-friendly binderless particle board |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101618565A (en) * | 2009-04-28 | 2010-01-06 | 王勇 | Manufacture method of environment-friendly wood substrate composite material |
| CN102179856A (en) * | 2011-04-07 | 2011-09-14 | 云南工业大麻股份有限公司 | High-intensity shaving board and manufacturing method thereof |
| CN102248572A (en) * | 2011-07-19 | 2011-11-23 | 中南林业科技大学 | Method for manufacturing high-strength environmentally-friendly binderless particle board |
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| 利用碱木素生产热压人造板材;郑紫崖;《建筑材料工业》;19620228(第2期);文章第17页 * |
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