Lignin flame redardant fibre board adhesive and its production method
Technical field
The present invention relates to adhesive field, particularly a kind of lignin flame redardant fibre board adhesive and its production method.
Background technology
Fibre board is by the molding of lignin fibre intertexture and using its wood-based plate made by intrinsic gluing performance.Fibre board is most
Conventional adhesive is Lauxite or modified urea-formaldehyde resin.Lauxite simple production process, low cost, but resistance to water and strong
Degree is relatively low, through tripolycyanamide, phenol or resorcinol, acrylate copolymer, isocyanates, polyvinyl alcohol or lignin etc.
Modified Lauxite significantly improves resistance to water and adhesion strength.One of raw materials for production of Lauxite or modified urea-formaldehyde resin
Formaldehyde, therefore, using Lauxite or modified urea-formaldehyde resin as adhesive wood-based plate inevitable release formaldehyde.
Formaldehyde is the stealthy killer of health, and indoor concentration of formaldehyde is more than 0.5mg/m, and people stays 5 hours in such environment, will feel
To dizziness.Concentration of formaldehyde is in for a long time more than 0.5mg/m, will be carcinogenic, therefore burst size of methanal is that restriction industry of artificial boards is sent out
One key factor of exhibition.
Guangxi Nanning Green Park Beilin Wood Industry Co., Ltd. has been carried out for low residual formaldehyde urea-formaldehyde resin adhesive in a large number
Research, and applied for Patents, the patent of application publication number CN103450432A:A kind of low residual formaldehyde Lauxite
Production method, its primary raw material are formaldehyde and carbamide, and disposably to feed intake, carbamide feeds intake formaldehyde in three times;The life of Lauxite
Product is divided into prepolymerization, polymerization and later stage polymerization three phases, by controlling each stage inventory and reaction temperature, it is to avoid poly-
Conjunction process embeds the generation of phenomenon, and the Lauxite narrow molecular weight distribution of gained, residual formaldehyde are low.Application publication number is
The patent of CN103450832A:A kind of glutinous agent of modified urea-formaldehyde resin glue of low residual formaldehyde and its production method, by using
Modified urea-formaldehyde resin, reinforcing agent and defoamer be primary raw material, made by adhesive residual formaldehyde < 0.1mg/L, as people
The adhesive of plate is made, burst size of methanal is extremely low, protect the health of consumer.Application publication number is special for CN 103408712A's
Profit:A kind of production method of low residual formaldehyde polyvinyl alcohol modification glue urea formaldehyde adhesive, its primary raw material are formaldehyde, carbamide
And polyvinyl alcohol, the low adhesive of residual formaldehyde is gone out by prepolymerization, polymerization and later stage polymerization three phases final production.To the greatest extent
Pipe is thus, as formaldehyde is one of main raw materials for production, with the inevitable release formaldehyde of wood-based plate made by Lauxite, use up
It is low that Gutron crosses above technical controlling residual formaldehyde, but still has room for improvement.Meanwhile, Lauxite due to industrialization degree compared with
Height, production technology are more ripe, and cost is difficult to reduce, and cause current urea-formaldehyde resin adhesive market price harmful competition.
Lignin is the most abundant and most important organic polymer that plant kingdom is only second to cellulose, is distributed widely in and has
In higher plant more than fascicular pteridophyte plant, it is that a class is connected by ehter bond and carbon-carbon bond by benzene oxide unit
Unformed high polymer, lignin have wide variety of potential quality, first lignin itself in adhesive due to its molecular characterization
With caking property, adhesive can be directly used as.Authorize Publication No.:The patent of CN100381534C:A kind of lignin environmental protection
Type binding agent and preparation method thereof, obtains lignin binding agent by the method washed lignin, prepare lignin liquor, though it is main
Raw material is wanted for lignin, but still with formaldehyde as one of raw material, made by adhesive still have a small amount of Form aldehyde release;Application publication number
For the invention of CN101928536A:A kind of flame retardant modified lignin resin glue and preparation method thereof, is obtained by following components raw material:It is dense
Formalin 20-30wt% for 30-50% is spent, the aldehydes matter 8-12wt% containing three-functionality-degree is balance of with draft lignin to be
The papermaking wastewater of main active substances, it is seen then that still with formaldehyde as main raw material in the invention, unavoidable to have formaldehyde residual
Stay;Meanwhile, lignin is equally widely used in phenolic resin and the glutinous agent of melamine-formaldehyde resin adhesive, but same presence
The free problem of formaldehyde.Inventor is studied to anti-flammability adhesive on this basis, for low residues of formaldehyde, fire retardancy
The development of strong type fibre board or other wood-based plates is had laid a good foundation.
The content of the invention
The purpose of the present invention is supplied for above technology, there is provided a kind of lignin flame redardant fibre board adhesive and its production
Method, solves current fibre board adhesive and has residues of formaldehyde harm environment, and lignin is that adhesive made by main material is same
Problem containing formaldehyde, a kind of adhesion strength of exploitation is high, adhesive speed is fast, the fibre board adhesive of good flame resistance.
Technical scheme is as follows:
Lignin flame redardant fibre board adhesive, is made up of the raw material of following parts by weight:
Lignin 20-30 parts;
Phenol 20-30 parts;
Starch 15-20 parts;
Silane coupler 1-5 parts;
Fire retardant 5-10 parts;
0.1~0.2 part of defoamer.
The starch is tapioca, potato starch, the one kind in flour or combinations thereof.
The silane coupler is VTES, three tert-butoxy vinyl silanes, three second of anilinomethyl
TMOS, γ-r-chloropropyl trimethoxyl silane, gamma-methyl allyl acyloxypropyl trimethoxysilane, 3-(2,3 epoxies third
Oxygen)Propyl trimethoxy silicane, mercaptopropyl trimethoxysilane, methyl vinyl diethoxysilane and mercapto hydroxypropyl methyl diformazan
One kind or combinations thereof in TMOS.Inventor find the present invention develop lignin flame redardant fibre board adhesive with compared with
Good wettability, it is relatively low relative to traditional Lauxite, phenolic resin or its modifier adhesive surface tension, and add and send out
Bright described silane coupler, can more preferably effectively improve the adhesive property of lignin adhesive of the present invention.This is because:Silane
Both contained organic group in the molecular structure of coupling agent, contained inorganic structure again, this special molecular structure make its with
The characteristic and function of machine thing and inorganic matters, using silane coupler combined with lignin adhesive it is rear with excellent resistance to water,
Thermostability, weatherability, chemical-resistant and low surface tension, this is possibly due to one end siloxanes hydrolysis life in silane coupler
Into silanol can react to form chemical bond with the hydroxyl on adherend and filler surface or oxide, organic active functional group and glue
Glutinous agent reaction also forms chemical bond, and the sub- intermolecular forces of chemical bond energy score want the high 1-2 order of magnitude;Meanwhile, silane coupler
The other end is connected with the active group after lignin modification, forms preferable chemical affinity, two ends bridging, as erected
Bridge, plays irreversible cementation after solidification, obtain naturally the bond effect of high intensity.
The fire retardant is APP, magnesium hydroxide, aluminium hydroxide, triphenyl phosphate, melamine cyanurate,
Melamine polyphosphate, Firebrake ZB, red phosphorus, one kind of antimony oxide or combinations thereof.
The defoamer is polydimethylsiloxane or tributyl phosphate.
The production method of lignin flame redardant fibre board adhesive, carries out pretreatment reaction to lignin first, is obtained wooden
Plain modifier, then according to pressing formula proportion adds starch, fire retardant, silane coupler and defoamer in stirred autoclave,
Mix homogeneously, then 1-2 hours are ground with three-roll grinder, adhesive of the viscosity for 0.15-0.60Pas at obtaining 18-20 DEG C.
The modified lignin is obtained by the following method:
(1)It is prepared by lignin:By adding acid in the black liquor to the alkaline boiling method slurrying with bagasse as raw material, examine
Consider the overall merits such as cost, production ease for operation, sulphuric acid, hydrochloric acid, carbon dioxide and aluminum sulfate are selected to add acid, adjust black liquor
PH to less than 6, preferably in pH1-4, place to insoluble matter all precipitating, standing time is 24-72h, then will precipitation
Thing is separated with the material beyond precipitate, and separation can be carried out by routine filtration device or Suction filtration device, the precipitate for obtaining
It is dried, obtains the lignin product that purity is 50-80wt%;To obtain the lignin of higher purity, the precipitate to obtaining make into
One step purification process, concrete technology is:Add water in precipitate acid adding again, adjusts pH1-4, is dried after washing, repeats at this
Reason process more than 2 times, can make more than 80wt% high-purity lignin products, subsequently into subsequent production processing procedure.
(2)In step(1)70wt% sulphuric acid is added in the lignin for obtaining, after stirring, 140-160 DEG C is warming up to, sulphur
Change reaction 1-2 hours;Through evaporator with central downcomer, circulation rate is 0.4m/s-0.5m/s, control discharging moisture
For 30wt%, precipitation, it is 15wt% that Jing is filtered, is dried to water content;By lignin:Phenol 1:1(Weight ratio)Add phenol, control
Temperature 85-95 DEG C, insulation reaction 1 hour finally adjust pH with 30wt% sodium hydroxide and obtain final product modified lignin to 6.5-7.0.
Step(2)Sulfonation modifying is carried out to lignin first in reaction, phenolate is then carried out and is modified, final obtained modified lignin is lived
Property group it is many, organic active is high, is combined the function of being more beneficial for performance adhesive with silane coupler.
Beneficial effects of the present invention are:
First, the problem containing formaldehyde in traditional fibre plate adhesive, the lignin flame redardant fiber that the present invention is developed are changed
Plate adhesive is primary raw material using lignin, through a series of modified, is combined with fire retardant, silane coupler,
The gluing performance of adhesive can be significantly improved, the lignin adhesive has viscosity low, low to adherend surface tension, easily
Moistening, the advantages of adhesion strength is big;This is because the active group after lignin modification is easy to silane coupler formed together
Chemical interactions, and the other end combines to form chemical bond with adherend surface, is much stronger than 1-2 quantity of intermolecular force
Level, and has the advantages that waterproof, high temperature resistant, makes adhesive and fibre board formation " bridge " structure, reach be tightly combined, firmly,
Irreversible as closely linked as flesh and blood bond effect.
2nd, fire retardancy is strong.The lignin adhesive skeleton of the present invention is modified lignin, and by rationally addition resistance
Combustion agent composition and ratio so that the lignin adhesive of the present invention has outstanding fire resistance, lignin skeleton, active group
, on the basis of adhesive performance is given full play to, fire resistance is higher, is suitable for for group, silane coupler and effectively cooperation fire retardant
The preparation of Flame retardant staple's plate.
3rd, the lignin flame redardant fibre board adhesive viscosity scope of application that the present invention is developed is big, from 0.15~0.60Pas
Good using effect can be played, is suitable for the bonding demand of various different demands fibre boardes.
4th, low production cost, easily realizes.The lignin adhesive of the present invention is using the alkaline boiling method with bagasse as raw material
The high-load lignin that the black liquor Jing process of slurrying is obtained, belongs to refuse reclamation, reduces the cost of raw material, while
Waste discharge is reduced, the road of sustained development is walked, with important value and meaning;In addition, the preparation process of this lignin adhesive
Industrialized condition is ripe, easily realizes big production, possesses the basis of large-scale promotion.
Specific embodiment
1 lignin flame redardant fibre board adhesive factory formula of embodiment and method 1
Formula is constituted:
25 parts of lignin;
25 parts of phenol;
15 parts of tapioca;
0.5 part of VTES;
0.5 part of anilinomethyl triethoxysilane;
5 parts of APP;
0.1 part of polydimethylsiloxane.
Production method:Lignin first to obtaining carries out pretreatment reaction, modified lignin is obtained, then according to matching somebody with somebody
Square ratio adds tapioca, VTES and anilinomethyl triethoxysilane in stirred autoclave, gathers
Ammonium phosphate and defoamer, mix homogeneously, then ground 1 hour with three-roll grinder, at obtaining 18-20 DEG C, viscosity is 0.15Pas
Adhesive
Modified lignin is obtained by the following method:
(1)It is prepared by lignin:By adding 50wt% in the black liquor to the alkaline boiling method slurrying with bagasse as raw material
Sulphuric acid, adjusts black liquor pH6, places to insoluble matter all precipitating, and standing time is 72h, then by precipitate and precipitate
Material in addition is separated, the drying precipitate for obtaining;Precipitate to obtaining is further purified process:In precipitate again
Add water 50wt% sulphuric acid, adjusts pH2, is dried after washing, repeats the processing procedure 3 times, can make the high-purity of 83.5wt%
Lignin product, subsequently into subsequent production processing procedure.
(2)In step(1)70wt% sulphuric acid is added in the lignin for obtaining, after stirring, 140 DEG C is warming up to, sulfonation is anti-
Answer 1 hour;Through evaporator with central downcomer, circulation rate is 0.4m/s-0.5m/, controls discharging moisture and is
30wt%, precipitation, it is 15wt% that Jing is filtered, is dried to water content;By lignin:Phenol 1:1(Weight ratio)Add phenol, control temperature
85 DEG C of degree, insulation reaction 1 hour finally adjust pH with 30% sodium hydroxide and obtain final product modified lignin to 6.8.
2 lignin flame redardant fibre board adhesive factory formula of embodiment and method 2
Formula is constituted:
20 parts of lignin;
20 parts of phenol;
18 parts of potato starch;
1 part of anilinomethyl triethoxysilane
1 part of γ-r-chloropropyl trimethoxyl silane;
10 parts of magnesium hydroxide;
0.1 part of tributyl phosphate
Production method:Lignin first to obtaining carries out pretreatment reaction, modified lignin is obtained, then according to matching somebody with somebody
Square ratio adds potato starch, anilinomethyl triethoxysilane and γ-r-chloropropyl trimethoxyl silicon in stirred autoclave
Alkane, magnesium hydroxide and defoamer, mix homogeneously, then ground 1 hour with three-roll grinder, at obtaining 18-20 DEG C, viscosity is
The adhesive of 0.35Pas.
Modified lignin is obtained by the following method:
(1)It is prepared by lignin:By adding 50wt% in the black liquor to the alkaline boiling method slurrying with bagasse as raw material
Sulphuric acid, adjusts black liquor pH5, places to insoluble matter all precipitating, and standing time is 48h, then by precipitate and precipitate
Material in addition is separated, the drying precipitate for obtaining;Precipitate to obtaining is further purified process:In precipitate again
Add water 50wt% sulphuric acid, adjusts pH2.5, is dried after washing, repeats the processing procedure 5 times, can make the high-purity of 87.1wt%
Degree lignin product, subsequently into subsequent production processing procedure.
(2)In step(1)70wt% sulphuric acid is added in the lignin for obtaining, after stirring, 150 DEG C is warming up to, sulfonation is anti-
Answer 1.5 hours;Through evaporator with central downcomer, circulation rate is 0.4m/s-0.5m/s, controls discharging moisture and is
30wt%, precipitation, it is 15wt% that Jing is filtered, is dried to water content;By lignin:Phenol 1:1(Weight ratio)Add phenol, control temperature
85 DEG C of degree, insulation reaction 1 hour finally adjust pH with 30wt% sodium hydroxide and obtain final product modified lignin to 6.7.
3 lignin flame redardant fibre board adhesive factory formula of embodiment and method 3
Formula is constituted:
30 parts of lignin;
30 parts of phenol;
20 parts of flour;
2 parts of gamma-methyl allyl acyloxypropyl trimethoxysilane;
3—(2,3 the third oxygen of epoxy)1 part of propyl trimethoxy silicane;
2 parts of mercaptopropyl trimethoxysilane;
3 parts of triphenyl phosphate;
4 parts of melamine cyanurate;
0.18 part of polydimethylsiloxane.
Production method:Lignin first to obtaining carries out pretreatment reaction, modified lignin is obtained, then according to pressing
Formula proportion add in stirred autoclave flour, gamma-methyl allyl acyloxypropyl trimethoxysilane and 3-(2,3 epoxies third
Oxygen)Propyl trimethoxy silicane, mercaptopropyl trimethoxysilane, melamine cyanurate, triphenyl phosphate and defoamer, mix
Close uniform, then ground 2 hours with three-roll grinder, adhesive of the viscosity for 0.50Pas at obtaining 18-20 DEG C.
Modified lignin is obtained by the following method:
(1)It is prepared by lignin:By adding 50wt% in the black liquor to the alkaline boiling method slurrying with bagasse as raw material
Sulphuric acid, adjusts black liquor pH4, places to insoluble matter all precipitating, and standing time is 72h, then by precipitate and precipitate
Material in addition is separated, the drying precipitate for obtaining;Precipitate to obtaining is further purified process:In precipitate again
Add water 50wt% sulphuric acid, adjusts pH1, is dried after washing, repeats the processing procedure 4 times, can make the high-purity of 85.1wt%
Lignin product, subsequently into subsequent production processing procedure.
(2)In step(1)70wt% sulphuric acid is added in the lignin for obtaining, after stirring, 150 DEG C is warming up to, sulfonation is anti-
Answer 2 hours;Through evaporator with central downcomer, circulation rate is 0.4m/s-0.5m/s, controls discharging moisture and is
30wt%, precipitation, it is 15wt% that Jing is filtered, is dried to water content;By lignin:Phenol 1:1(Weight ratio)Add phenol, control temperature
90 DEG C of degree, insulation reaction 1 hour finally adjust pH with 30wt% sodium hydroxide and obtain final product modified lignin to 6.8.
4 lignin flame redardant fibre board adhesive factory formula of embodiment and method 3
Formula is constituted:
28 parts of lignin;
28 parts of phenol;
20 parts of potato starch;
1 part of methyl vinyl diethoxysilane;
2 parts of mercapto hydroxypropyl methyl dimethoxysilane;
1 part of mercaptopropyl trimethoxysilane;
4 parts of melamine polyphosphate;
5 parts of Firebrake ZB;
0.15 part of tributyl phosphate.
Production method:Lignin first to obtaining carries out pretreatment reaction, modified lignin is obtained, then according to pressing
Formula proportion adds potato starch, methyl vinyl diethoxysilane and mercapto hydroxypropyl methyl dimethoxy in stirred autoclave
Base silane, mercaptopropyl trimethoxysilane, melamine polyphosphate, Firebrake ZB and defoamer, mix homogeneously, then ground with three rollers
Grinding machine grinds 2 hours, adhesive of the viscosity for 0.60Pas at obtaining 18-20 DEG C.
Modified lignin is obtained by the following method:
(1)It is prepared by lignin:By adding 50wt% in the black liquor to the alkaline boiling method slurrying with bagasse as raw material
Sulphuric acid, adjusts black liquor pH4, places to insoluble matter all precipitating, and standing time is 72h, then by precipitate and precipitate
Material in addition is separated, the drying precipitate for obtaining;Precipitate to obtaining is further purified process:In precipitate again
Add water 50wt% sulphuric acid, adjusts pH1, is dried after washing, repeats the processing procedure 6 times, can make the high-purity of 88.5wt%
Lignin product, subsequently into subsequent production processing procedure.
(2)In step(1)70wt% sulphuric acid is added in the lignin for obtaining, after stirring, 160 DEG C is warming up to, sulfonation is anti-
Answer 2 hours;Through evaporator with central downcomer, circulation rate is 0.4m/s-0.5m/s, controls discharging moisture and is
30wt%, precipitation, it is 15wt% that Jing is filtered, is dried to water content;By lignin:Phenol 1:1(Weight ratio)Add phenol, control temperature
90 DEG C of degree, insulation reaction 1 hour finally adjust pH with 30wt% sodium hydroxide and obtain final product modified lignin to 6.8.
Embodiment 5
The measure of the residual quantity of formaldehyde is carried out to the lignin flame redardant fibre board adhesive obtained by embodiment 1-4, and is pressed
According to the regulation detection bonding strength in GB/T9846.1- 9846.8-2004.Formaldehyde determination adopts acetylacetone,2,4-pentanedione spectrophotography,
Residual formaldehyde %=measured value/example weight × %, and its flame retardant effect is tested, it is as a result as shown in the table:
As seen from the above table, the lignin flame redardant fibre board adhesive residues of formaldehyde that the present invention is developed is 0, using safety coefficient
It is high compared with Lauxite, while bonding strength is also more excellent relative to Lauxite, this is because silane coupler is played wherein
Important function.Fire resistance test shows:The lignin adhesive oxygen index (OI) ﹥ 30 of the present invention, while energy self-extinguishment, and do not produce
Raw cigarette, possesses preferable fire resistance.It can be seen that, the lignin adhesive of the present invention not only has bonding strength height, uses safety
The advantages of, and flame-retardant adhesive can be reached use standard.