CN109333719A - A kind of furfuryl alcohol resin Wood modifier and the preparation method and application thereof - Google Patents
A kind of furfuryl alcohol resin Wood modifier and the preparation method and application thereof Download PDFInfo
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- CN109333719A CN109333719A CN201811252454.2A CN201811252454A CN109333719A CN 109333719 A CN109333719 A CN 109333719A CN 201811252454 A CN201811252454 A CN 201811252454A CN 109333719 A CN109333719 A CN 109333719A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
- B27K3/52—Impregnating agents containing mixtures of inorganic and organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K2240/00—Purpose of the treatment
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- Wood Science & Technology (AREA)
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- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
The present invention relates to a kind of furfuryl alcohol resin Wood modifiers and the preparation method and application thereof.Furfuryl alcohol resin Wood modifier of the present invention includes furfuryl alcohol and polyvinyl alcohol, and the degree of polymerization of the polyvinyl alcohol is 300~5000.By the way that furfuryl alcohol and polyvinyl alcohol to be used cooperatively, mixed modifier is developed.Wooden modifying is carried out using mixed modifier provided by the invention, obtained furfuryl alcohol resin improved wood has preferable waterproofness and dimensional stability, the toughness of improved wood significantly improves simultaneously, the comprehensive performance of furfuryl alcohol resin improved wood is greatly improved, the utilization rate and service life of timber are improved.
Description
Technical field
The present invention relates to timber processing and preservation fields, and in particular to a kind of furfuryl alcohol resin Wood modifier and its preparation side
Method and application.
Background technique
Timber is a kind of ecological environment material nd of function admirable, but wooden resource material polar hydroxyl groups base rich in
Group will appear the bulking or drying shrinkage of volume when moisture enters or is precipitated.This breathing is anisotropic, to will cause wood
The unstability of matter resource material geometry；Sometimes each to inhomogeneities because of breathing, also result in wooden resource material hair
The disadvantages such as raw cracking, warpage.It, can be by various in order to overcome bulking, drying shrinkage to wooden resource material using bring obstacle
Physics, chemical means are handled, to improve their dimensional stability, thus the service life of prolonging wood.
In recent years, furfuryl alcohol resin modification technology relies on its unique advantage: 1) furfuryl alcohol is (mainly beautiful with renewable resource
Rice cob) it is prepared by raw material；2) property such as the dimensional stability of modified timber and durability significantly improve, excellent combination property；
3) small to the small toxicity and environmental pollution of biology, cause the extensive concern of researcher.
Patent application 201710166207.X provides a kind of composite modified fast growing wood and its composite modifying method, makes
The treatment fluid being uniformly mixed with Aluminum sol, deionized water and furfuryl alcohol is alternately repeated vacuum impregnation and normal pressure dipping for several times, makes
Modified timber has the saturate feature of high-grade timber, has preferable dimensional stability, thermal stability and surface anti-
It is aqueous.Patent application 201610622120.4 discloses a kind of furfuryl alcohol resin optimization liquid for Wooden modifying, including with the following group
Point: furfuryl alcohol 50%-70%, maleic anhydride 5%-10%, stabilizer 1%-5%, solvent 5%-10% and water 20%-45%.It should
Timber optimizes in liquid, and maleic anhydride is used as stabilizer and ethyl alcohol and methanol in conjunction with sodium carbonate and is compounded with as catalyst
Solvent prepares furfuryl alcohol resin timber optimization liquid, so that improved wood has significant anti-corrosive properties, resistance leachability, size steady simultaneously
The advantages that qualitative, realizes the superior of low-grade timber, improves the utilization rate and service life of timber.
The modified material of furfuryl alcohol resin has excellent comprehensive performance, commercially produces although having been realized in, current chaff
The big problem of the modified material brittleness of alcohol limits its application and development.The toughness and impact strength of the modified material of furfuryl alcohol significantly reduce,
It is related with rate of body weight gain (WPG) that impact strength reduces degree.The modification material that WPG is 15%, 125%, impact strength reduce about respectively
25%, 65%.The impact bending strength of the discovery such as Lande, the modified Lapland pine sapwood of furfuryl alcohol resin has dropped 19%~37%.
Therefore, it is necessary to develop the method for improving the toughness of furfuryl alcohol improved wood, expand the scope of application of the modified material of furfuryl alcohol resin.
Summary of the invention
For solve the technical problems existing in the prior art, it is excellent the purpose of the present invention is to provide a kind of waterproof performance and
Preferable furfuryl alcohol resin Wood modifier of toughness and the preparation method and application thereof.
In the research process to furfuryl alcohol resin improved wood, inventors have found that the mechanical property of the modified material of furfuryl alcohol resin
Reduction, on the one hand may be because modifying process in heat and acid condition, cause the Partial digestion of wood components；Another party
Face then may be that polymerization reaction occurs, ultimately forms close figure knot since furfuryl alcohol is in wood cell wall and lumen
Structure, strand freedom degree reduce, and brittleness increases.For the poor toughness for solving the problems, such as furfuryl alcohol resin improved wood, inventor once tasted
Examination optimization modified condition and the suitable modifying agent of screening.By largely studying, addition can be in modifying agent for inventor's discovery
The long flexible chain molecule of furfuryl alcohol reaction is a kind of effective solution method, and long flexible chain molecule can control the degree of cross linking of furfuryl alcohol,
Brittleness can be made to reduce, toughness increases.To different kinds of molecules structure, physicochemical property, the molecular weight polymer different with the degree of polymerization into
During row screening, polyvinyl alcohol can preferably react with furfuryl alcohol, not influence furfuryl alcohol to the modified function of timber
In the case where, the degree of cross linking of furfuryl alcohol can be effectively controlled, and then in the dimensional stability for effectively improving furfuryl alcohol resin improved wood
While, significantly improve the toughness of improved wood.
Firstly, the present invention provides a kind of furfuryl alcohol resin modifying agent for Wooden modifying comprising furfuryl alcohol (FA) and poly- second
Enol (PVA).
The degree of polymerization of polyvinyl alcohol of the present invention is 300~5000；Preferably 300~2400.
Inventor has found that furfuryl alcohol and polyvinyl alcohol are mixed in modifying agent with specific mass concentration, and modified obtained timber exists
The comprehensive performances such as dimensional stability and toughness are more superior.
The ratio of the mass percentage of polyvinyl alcohol and furfuryl alcohol is (2%~30%) in modifying agent of the present invention:
(10%~90%)；Preferably (2%~20%): (15%~50%).
Further, modifying agent of the present invention includes following component: 10~80 parts of furfuryl alcohol, 2~10 parts of polyvinyl alcohol,
0.2~3 part of catalyst, 0.5~6 part of stabilizer, 40~90 parts of solvent.
Preferably, modifying agent of the present invention is grouped as by following group: 10~50 parts of furfuryl alcohol, 2~5 parts of polyvinyl alcohol,
0.3~2 part of catalyst, 1~4 part of stabilizer, 40~85 parts of solvent.
Further, catalyst of the present invention is maleic anhydride, sulfuric acid, citric acid, tartaric acid, oxalic acid, acetic acid, water
One of poplar acid is a variety of, preferably one of maleic anhydride, sulfuric acid, citric acid, tartaric acid or a variety of；
And/or the stabilizer be one of sodium tetraborate, sodium hydroxide, sodium bicarbonate, sodium phosphate, sodium carbonate or
It is a variety of.
As one embodiment of the present invention, the catalyst and stabilizer are respectively sulfuric acid and sodium hydroxide.
As another embodiment of the invention, the catalyst and stabilizer are respectively citric acid and sodium bicarbonate.
As another embodiment of the invention, the catalyst and stabilizer be respectively tartaric acid and sodium phosphate and
Sodium carbonate.
As another embodiment of the invention, the catalyst and stabilizer are respectively maleic anhydride and tetraboric acid
Sodium.
In the present invention, the solvent is molten for the mixing of water or water and one of methanol, ethyl alcohol, acetone or a variety of compositions
Agent.
As the preferred embodiment of the present invention, the solvent is water.
On the other hand, the present invention also provides the preparation method of the modifying agent, include the following steps: catalyst and steady
Determine agent to be dissolved in the solvent, furfuryl alcohol mixing is added, polyvinyl alcohol is added, sufficiently dissolves to obtain the final product.
As the preferred embodiment of the present invention, the preparation method of the modifying agent includes the following steps: polyethylene
Alcohol is dissolved in the water；Catalyst and stabilizer are dissolved in the water, after addition furfuryl alcohol is sufficiently mixed, after dissolution is added while stirring
Poly-vinyl alcohol solution, sufficiently dissolve to obtain the final product.Described be dissolved under the conditions of 20-30 DEG C of temperature carries out.
On the other hand, the present invention also provides modifying agent made from the modifying agent or the preparation method changes in timber
Property prepares application in furfuryl alcohol improved wood.
On the other hand, the present invention also provides a kind of preparation methods of furfuryl alcohol improved wood, for using of the present invention
Modifying agent made from modifying agent or preparation method of the present invention is modified timber；It is described to be modified as using full-cell process
It is modified processing.
Further, the preparation method of the furfuryl alcohol improved wood includes the following steps:
(1) timber is placed in reaction kettle, vacuum degree be -0.07~-0.1Mpa under the conditions of carry out vacuum processing 20~
60min imports the modifying agent into reaction kettle, carried out under conditions of pressure is 0.5-2.0Mpa pressurized treatments 30~
120min；
(2) immobilization: after the timber of processing is taken out, timber being sealed, after placing 5~30h at normal temperature, 90~
3~8h of immobilization under the conditions of 120 DEG C；
(3) dry: dry 2~4h under the conditions of 40~60 DEG C and 70~90 DEG C of temperature respectively is placed in 90~120 DEG C of temperature
Condition is down toward being completely dried.
As the preferred embodiment of the present invention, the preparation method of the furfuryl alcohol improved wood includes the following steps:
(1) timber is placed in reaction kettle, vacuum degree be -0.07~-0.1Mpa under the conditions of carry out vacuum processing 30~
60min imports the modifying agent into reaction kettle, carried out under conditions of pressure is 0.5-1.0Mpa pressurized treatments 30~
60min；
(2) immobilization: after the timber of processing is taken out, timber being sealed, place 12 at normal temperature~for 24 hours after, 90~
3~5h of immobilization under the conditions of 110 DEG C；
(3) dry: dry 2~4h under the conditions of 40~60 DEG C and 70~90 DEG C of temperature respectively is placed in 90~110 DEG C of temperature
Condition is down toward being completely dried.
Timber of the present invention includes but is not limited to softwood, such as U.S.'s Southern Pine, Lapland pine, masson pine；Often
See broadleaf, such as Cathay poplar, Chinese white poplar, birch.
The beneficial effects of the present invention are:
(1) present invention has obtained the mixed and modified of stable homogeneous by introducing polyvinyl alcohol in furfuryl alcohol resin modifying agent
Agent carries out the modification of timber using modifying agent provided by the invention, compared with furfuryl alcohol is individually modified, the moisture absorption and suction of improved wood
The cubical expansivity of water slightly reduces, and maintains the preferable dimensional stability of furfuryl alcohol improved wood, while significantly improving and changing
Property timber toughness, and then improve the utilization rate of the modified material of furfuryl alcohol, expanded application range, increase modified material
Service life.
(2) mixed modifier provided by the invention is prepared at normal temperature, and cost of material is low, easy to operate, is suitable for extensive
Popularization and use.
(3) preparation method of improved wood provided by the invention completes the modification of timber by disposably dipping,
Obtained improved wood has the excellent comprehensive performance that dimensional stability is high, toughness is high, and preparation process energy-saving ring
It protects, reduces the production cost of improved wood.
Detailed description of the invention
Fig. 1 is that the moisture content of the improved wood of different modifying agent preparations in the fuchsin(e)test of experimental example 1 changes over time.
Fig. 2 is that the moisture content of the improved wood of different modifying agent preparations in the water absorption test of experimental example 2 changes over time.
Specific embodiment
The preferred embodiment of the present invention is described in detail below in conjunction with embodiment.It will be appreciated that following real
Providing merely to play the purpose of explanation for example is applied, is not used to limit the scope of the present invention.The skill of this field
Art personnel without departing from the spirit and purpose of the present invention, can carry out various modifications and replace to the present invention.
Experimental method used in following embodiments is conventional method unless otherwise specified.
The materials, reagents and the like used in the following examples is commercially available unless otherwise specified.
In order to compare the performance of variant embodiment and comparative example processing material, as an example, wood used in following embodiment
Material is Cathay poplar, however, those skilled in the art should understand that, timber of the present invention is not limited to Cathay poplar, other timber such as needle
Leaf material (such as U.S.'s Southern Pine, Lapland pine, masson pine), broadleaf (such as Chinese white poplar, birch) etc..
In following embodiment and comparative example furfuryl alcohol resin improved wood the preparation method is as follows:
Impregnation is carried out to timber using full-cell process: timber being placed in immersion can and is first vacuum-treated, relatively
Vacuum degree is -0.1MPa, and the processing time is 30min；Wood modifier is imported, pressurized treatments, the opposite pressure of pressurized treatments are carried out
Power is 0.5Mpa, and the processing time is 30min；After timber is taken out, test specimen is sealed using valve bag, is placed at normal temperature for 24 hours
Afterwards, 3h is dried under the conditions of 103 DEG C, makes its solidification, is then dried 2h under the conditions of 60 DEG C and 80 DEG C of temperature respectively, is finally existed
It dries under the conditions of 103 DEG C of temperature to over dry.
Embodiment 1
500g furfuryl alcohol, 10g sulfuric acid, 20g sodium hydroxide are weighed, is put into beaker, 420g distilled water is added, side uses more
Point magnetic agitation plate is stirred side and is slowly added to 50g PVA2400, prevents PVA from agglomerating in water and increases dissolution time, directly
It is all dissolved to solid, obtains the 5%PVA and 50% furfuryl alcohol mixed modifier of 1000g.Whole process maintains the temperature at room temperature
20-30 DEG C of range, mixing speed 100rpm, mixing time 20min complete the preparation of PVA-FA mixed modifier.
The various of the furfuryl alcohol resin improved wood of embodiment 1 are prepared using the PVA-FA mixed modifier of above-mentioned preparation
The standard specimen of size.
Embodiment 2
500g furfuryl alcohol, 17.5g citric acid, 20g sodium bicarbonate are weighed, is put into beaker, 412.5g distilled water, side are added
Side is stirred using multiple spot magnetic agitation plate and is respectively added slowly to 50g PVA 1750, prevents PVA from agglomerating and increasing in water
Dissolution time obtains the 5%PVA and 50% furfuryl alcohol mixed modifier of 1000g until solid all dissolves；Whole process is kept
Temperature completes the system of PVA-FA mixed modifier in 20-30 DEG C of range of room temperature, mixing speed 100rpm, mixing time 20min
It is standby.
The various of the furfuryl alcohol resin improved wood of embodiment 2 are prepared using the PVA-FA mixed modifier of above-mentioned preparation
The standard specimen of size.
Embodiment 3
Weigh 500g furfuryl alcohol, weigh 17.5g maleic anhydride, 20g sodium tetraborate is put into beaker, add 412.5g distillation
Water is respectively added slowly to 50g PVA 500 when being stirred using multiple spot magnetic agitation plate, prevent PVA agglomerate in water and
Increase dissolution time, until solid all dissolves, obtains the 5%PVA and 50% furfuryl alcohol mixed modifier of 1000g；Whole process,
20-30 DEG C of range of room temperature is maintained the temperature at, mixing speed 100rpm, mixing time 20min complete PVA-FA mixed modifier
Preparation.
The various of the furfuryl alcohol resin improved wood of embodiment 3 are prepared using the PVA-FA mixed modifier of above-mentioned preparation
The standard specimen of size.
Embodiment 4
500g furfuryl alcohol, 17.5g maleic anhydride, 20g sodium tetraborate are weighed, is put into beaker, then is separately added into 437.5g steaming
Distilled water is respectively added slowly to 25g PVA 500 when being stirred using multiple spot magnetic agitation plate, prevents PVA from agglomerating in water
And increase dissolution time, until solid all dissolves, obtain 1000g 2.5%PVA and 50% furfuryl alcohol mixed modifier；Entire mistake
Journey, maintains the temperature at 20-30 DEG C of range of room temperature, and it is mixed and modified to complete PVA-FA by mixing speed 100rpm, mixing time 20min
The preparation of agent.
The various of the furfuryl alcohol resin improved wood of embodiment 4 are prepared using the PVA-FA mixed modifier of above-mentioned preparation
The standard specimen of size.
Embodiment 5
100g furfuryl alcohol, 3.5g maleic anhydride, 4g sodium tetraborate are weighed, is put into beaker, then each addition 842.5g distilled water,
It is respectively added slowly to 25g PVA300 when being stirred using multiple spot magnetic agitation plate, prevents PVA from agglomerating and increasing in water
Dissolution time obtains the 2.5%PVA and 10% furfuryl alcohol mixed modifier of 1000g until solid all dissolves.Whole process is protected
Temperature is held in 20-30 DEG C of range of room temperature, mixing speed 100rpm, mixing time 20min complete the system of PVA-FA mixed modifier
It is standby.
The various of the furfuryl alcohol resin improved wood of embodiment 5 are prepared using the PVA-FA mixed modifier of above-mentioned preparation
The standard specimen of size.
Comparative example 1
Unseasoned timber, the standard specimen of the dry various sizes that timber is prepared to over dry under the conditions of 103 DEG C.
Comparative example 2
Weigh 3.5g maleic anhydride, 4g sodium tetraborate is put into beaker, adds 892.5g distilled water, use multiple spot magnetic force
Agitating plate is stirred, until solid all dissolves, 100g furfuryl alcohol is then added, and it is molten to obtain the furfuryl alcohol that 1000g concentration is 10%
Liquid；Whole process, maintains the temperature at 20-30 DEG C of range of room temperature, and mixing speed 100rpm, mixing time 20min complete furfuryl alcohol and change
The preparation of property agent.
The standard of the various sizes of the furfuryl alcohol resin improved wood of comparative example 2 is prepared using the modifying agent of above-mentioned preparation
Test specimen.
Comparative example 3
Weigh 17.5g maleic anhydride, 20g sodium tetraborate is put into beaker, adds 462.5g distilled water, use multiple spot magnetic
Power agitating plate is stirred, until solid all dissolves, 500g furfuryl alcohol is then added, and obtains the furfuryl alcohol that 1000g concentration is 50%
Solution；Whole process, maintains the temperature at 20-30 DEG C of range of room temperature, and mixing speed 100rpm, mixing time 20min complete furfuryl alcohol
The preparation of modifying agent.
The standard of the various sizes of the furfuryl alcohol resin improved wood of comparative example 3 is prepared using the modifying agent of above-mentioned preparation
Test specimen.
The hygroscopicity and moisture absorption dimensional stability of 1 improved wood of experimental example
The standard specimen (20 that Examples 1 to 5 and comparative example 1~3 are prepared is measured according to national standard CNS 6715-2013
× 20 × 20mm) hygroscopicity, and its dimensional stability is measured according to national standard LY/T 2490-2015.
It is 20 DEG C that standard specimen, which is placed on temperature, in the climatic chamber that relative humidity is 65%, measures standard specimen
Over dry, place 12h, for 24 hours, the quality and size at 48h, 96h time point.
The standard specimen of each embodiment and comparative example moisture content under sucting wet state changes with time rule such as Fig. 1 institute
Show.As seen from Figure 1, compared with the timber of non-modified processing, timber is modified using furfuryl alcohol, timber can be reduced
Hydroscopicity, improve its hygroscopicity.The standard specimen being prepared by comparison various concentration PVA-FA mixed modifier contains
The rule that water rate changes over time, it can be seen that compared with using furfuryl alcohol individually to handle, mixed modifier can make timber
Hydroscopicity has to be reduced by a small margin, shows that FA and PVA have Wooden modifying certain synergistic effect.
The standard specimen of each embodiment and comparative example is 20 DEG C in temperature, and relative humidity carries out moisture absorption under conditions of being 65%
When test, over dry, place 12h, for 24 hours, the volume bulking factor at 48h, 96h time point it is as shown in table 1.From table 1 it follows that
Compared with the timber of non-modified processing, it is substantially reduced using the timber moisture absorption cubical expansivity after furfuryl alcohol modification, size
Stability improves, and furfuryl alcohol concentration is bigger, and dimensional stability is better.It is modified when handling timber using PVA-FA mixed modifier
The volume bulking factor of timber is similar to the timber that furfuryl alcohol is individually modified or slightly reduces, i.e. PVA-FA mixed modifier maintains chaff
Alcohol preferable dimensional stability when being individually modified.
Table 1 handles volume bulking factor of the material in moisture absorption process
Data are the average value of three repeated experiments in table 1
The water imbibition and water suction volume expansion rate of 2 improved wood of experimental example
The standard specimen that Examples 1 to 5 and comparative example 1~3 are prepared is measured according to national standard GB/T 1934.1-2009
The water imbibition of (20 × 20 × 20mm), and its volume bulking factor is measured according to national standard ISO4860-1982.
It after standard specimen is weighed, is put into the container for filling distilled water, standard specimen is pressed into the water surface or less at least
50mm, covers container, measurement standard test specimen over dry, be immersed in the water 6h, 12h, for 24 hours, the quality at 48h, 96h, 192h time point
And size.
Timber moisture content under water suction state changes over time regular as shown in Figure 2.As seen from Figure 2, timber is being inhaled
Water cut changing law is similar in moisture absorption under the conditions of water, compared with the timber of non-modified processing, is individually modified using FA
And PVA-FA mixed modifier can be such that the water absorption rate of timber reduces.
The volume bulking factor that timber absorbs water in distilled water when reaching balance (192h) is as shown in table 2.It can from table 2
Out, compared with the timber of non-modified processing, after being modified using furfuryl alcohol, the volume bulking factor of timber is greatly lowered,
And the concentration of furfuryl alcohol solution in a certain range is higher, it is bigger that volume bulking factor when timber absorbs water reduces degree.Using PVA-
FA mixed modifier is modified processing to timber, and the volume bulking factor of timber is compared with the independent modification of the furfuryl alcohol of corresponding concentration
Volume bulking factor is similar or slightly reduces, i.e., PVA-FA mixed modifier maintains preferable dimensionally stable when furfuryl alcohol is individually modified
Property.
Volume bulking factor when 2 timber of table water suction balance
Data are the average value of three repeated experiments in table 2
The toughness of 3 improved wood of experimental example
According to national standard GB/T1928-2009, at 20 DEG C, under conditions of relative humidity (RH) is 65%, by Examples 1 to 5
Standard specimen (having a size of 300 × 20 × 20mm, length the is rift grain direction) damping being prepared with comparative example 1~3 is until weight
It measures constant.The tangential toughness of improved wood is measured according to national standard GB/T1940-2009, record standard test specimen center
Standard specimen is symmetrically placed on testing machine support, keeps testing machine Charpy impact long in standard specimen by tangential and radial dimension
It spends on the diametric plane in center, record sample absorbs energy.
The toughness of improved wood is as shown in table 3.From table 3 it can be seen that compared with the timber of non-modified processing,
The toughness of furfuryl alcohol improved wood is decreased obviously, and the concentration of furfuryl alcohol is bigger, and reduction is more obvious that (such as comparative example 2 and 3 compares
It is shown).The timber handled using PVA-FA mixed modifier, compared with being individually modified processing using FA, shock resistance is tough
Property significantly improve, and in a certain range, PVA concentration improves, the toughness of the timber of PVA-FA mixed modifier processing
Improvement is more preferable.
The toughness of the modified material of table 3
Data are the average value of three repeated experiments in table 3
In conclusion handling timber using the mixed modifier containing furfuryl alcohol and polyvinyl alcohol, furfuryl alcohol can maintained to change
Property the preferable moisture absorption of timber (water) performance and moisture absorption (water) dimensional stability in the case where, be obviously improved the anti-of improved wood
Impact flexibility obtains the superior improved wood of comprehensive performance.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvements and modifications can also be made, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of furfuryl alcohol resin modifying agent for Wooden modifying, which is characterized in that including furfuryl alcohol and polyvinyl alcohol.
2. modifying agent according to claim 1, which is characterized in that the degree of polymerization of the polyvinyl alcohol is 300~5000；It is excellent
It is selected as 300~2400.
3. modifying agent according to claim 1 or 2, which is characterized in that the matter of polyvinyl alcohol and furfuryl alcohol in the modifying agent
Measuring percentage composition ratio is (2%~30%): (10%~90%)；Preferably (2%~20%): (15%~50%).
4. described in any item modifying agent according to claim 1~3, which is characterized in that including following component: furfuryl alcohol 10~80
Part, 2~10 parts of polyvinyl alcohol, 0.2~3 part of catalyst, 0.5~6 part of stabilizer, 40~90 parts of solvent；
Preferably, the modifying agent is grouped as by following group: 10~50 parts of furfuryl alcohol, 2~5 parts of polyvinyl alcohol, and catalyst 0.3~2
Part, 1~4 part of stabilizer, 40~85 parts of solvent.
5. modifying agent according to claim 4, which is characterized in that the catalyst be maleic anhydride, sulfuric acid, citric acid,
One of tartaric acid, oxalic acid, acetic acid, salicylic acid are a variety of, preferably maleic anhydride, sulfuric acid, citric acid, one in tartaric acid
Kind is a variety of；
And/or the stabilizer is one of sodium tetraborate, sodium hydroxide, sodium bicarbonate, sodium phosphate, sodium carbonate or a variety of.
6. modifying agent according to claim 4 or 5, which is characterized in that the solvent is water or water and methanol, ethyl alcohol, third
The mixed solvent of one of ketone or a variety of compositions.
7. the preparation method of the described in any item modifying agent of claim 1~6, which comprises the steps of: will be catalyzed
Agent and stabilizer are dissolved in the solvent, and furfuryl alcohol mixing is added, and polyvinyl alcohol is added and sufficiently dissolves to obtain the final product.
8. modifying agent made from the described in any item modifying agent of claim 1~6 or preparation method as claimed in claim 7 is in wood
Material is modified or prepares application in furfuryl alcohol improved wood.
9. a kind of preparation method of furfuryl alcohol improved wood, which is characterized in that change using claim 1~6 is described in any item
Modifying agent made from property agent or preparation method as claimed in claim 7 is modified timber；It is described to be modified as using full cell
Method is modified processing.
10. the preparation method of furfuryl alcohol improved wood according to claim 9, which comprises the steps of:
(1) timber is placed in reaction kettle, vacuum degree be -0.07~-0.1Mpa under the conditions of carry out vacuum processing 20~
60min imports the described in any item modifying agent of claim 1~6 or preparation method system as claimed in claim 7 into reaction kettle
The modifying agent obtained carries out 30~120min of pressurized treatments under conditions of pressure is 0.5-2.0Mpa；
(2) immobilization: after the timber of processing is taken out, timber being sealed, after placing 5~30h at normal temperature, at 90~120 DEG C
Under the conditions of 3~8h of immobilization；
(3) dry: dry 2~4h under the conditions of 40~60 DEG C and 70~90 DEG C of temperature respectively is placed in 90~120 DEG C of temperature conditions
Down toward being completely dried.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN111941570A (en) * | 2020-08-14 | 2020-11-17 | 佛山(华南)新材料研究院 | Furfuryl-based wood modification liquid |
| CN113799230A (en) * | 2021-08-27 | 2021-12-17 | 北京林业大学 | Furfuryl alcohol modified liquid and preparation method and application thereof |
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| CN111941570A (en) * | 2020-08-14 | 2020-11-17 | 佛山(华南)新材料研究院 | Furfuryl-based wood modification liquid |
| CN113799230A (en) * | 2021-08-27 | 2021-12-17 | 北京林业大学 | Furfuryl alcohol modified liquid and preparation method and application thereof |
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