CN102642222B - Method for preparing aldehyde-free veneer boards by biological oil starch adhesives - Google Patents
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Abstract
The invention relates to a method for preparing aldehyde-free veneer boards by biological oil starch adhesives and belongs to the field of artificial board production. The method comprises the steps of biological oil starch adhesive preparation: vacuum filtration and reduced pressure distillation method are adopted for carrying out pretreatment on biological oil; wild cassava starch is added into water, starch emulsion and concentrated hydrochloric acid are prepared, after the temperature is raised, oxidants of persulfate are then added, and acidolysis oxidized starch emulsion is prepared through reaction; the biological oil is added into the emulsion, polyving akohol solution is added, then, alkali liquor and oxalic acid are repeatedly and alternately added; and then, borax is added until the viscosity reaches the requirements, and main agents of biological oil starch adhesives are obtained; and aldehyde-free veneer board preparation: single boards are dried and are subjected to adhesive coating at two sides by adopting the prepared adhesives, the single board blank assembly is carried out according to the odd layer principle and in a mode that the fiber directions of adjacent single boards are mutually vertical, the veneer boards are pressed and manufactured under the hot pressing curve, and the aldehyde-free veneer boards are obtained. The preparation process is simple, and the intensity of the prepared veneer boards reaches the requirements of II type veneer boards.
Description
Technical field
The invention belongs to artificial board production field, relate to a kind of preparation method of aldehyde-free by wood, particularly relate to the preparation method that aldehyde-free by wood prepared by a kind of bio oil starch adhesive.
Background technology
The adhesive that glued board uses is the key factor determining glued board quality, cost and environmental-protecting performance.At present, the preparation of glued board adopts traditional three aldehyde adhesive sticks (urea-formaldehyde resin adhesive, synvaren and melamine resin adehsive stick) more, wherein mainly adopts urea-formaldehyde resin adhesive, but this adhesive can discharge formaldehyde is detrimental to health; And, three aldehydes adhesive raw materials heavy dependence fossil resources, non-renewable.Along with the raising of consumer's environmental consciousness and relevant laws and regulations increasingly strict to the restriction of harmful substance, and the minimizing of fossil resource reserves, the high performance-price ratio aldehyde-free by wood that market active demand utilizes biomass adhesive to prepare.
At present, scientific research personnel has worked out multiple aldehyde-free by wood: CN101524857A invent a kind of adopt isocyanates spraying applications method prepare aldehyde-free by wood and method, but because isocyanates price is high, the glued board high expensive produced with it, should not promote on a large scale.CN 101045307A provides a kind of method of isocyanates blended cross linking modified ethylene acetate production of adhesive aldehyde-free by wood, but will prepare the glued board of high-quality, significantly need improve the ratio of isocyanates in adhesive, can cause glued board high expensive.CN102152345A provides a kind of method that plant albumin glue adhesive produces aldehyde-free by wood, glued board bonding strength prepared by this method and resistance to water all can reach the technical requirement of Lauxite, but in plant albumin glue adhesive preparation process, need to add multiple auxiliary agent just can reach requirement, and vegetable protein separating technology is comparatively complicated.
Utilizing starch-based glue stick to prepare glued board is a kind of ideal aldehyde-free by wood research direction, and a lot of scientific research personnel has carried out the research of this respect.CN101323762A provide a kind of with starch and polyvinyl alcohol (PVA) blended, add complexing agent and crosslinking agent is worth starch-based glue stick host, be curing agent with polyisocyanates, the obtained alternative Lauxite of adhesive, can be used for preparing aldehyde-free by wood, but polyisocyanates volatility is large, has certain pollution to production environment, and polyisocyanates addition is higher, cause the high expensive of glued board.It take cornstarch as primary raw material that CN101157833A has invented, with obtained starch-based aqueous macromolecule-isocyanate adhesive host, add curing agent PIC, obtain a kind of without starch aldehyde base adhesive, can be used for aldehyde-free by wood preparation, but this adhesive primary raw material is edible corn starch easily causes resource scarcity, and spread is limited.It is emulsion modified to composite modified starch that CN101857787A provides a kind of bio-oil-phenolic resin of synthesis that utilizes, prepare the method for starch-based glue stick, this adhesive can be used for aldehyde-free by wood preparation, but the ratio of bio-oil-phenolic resin is higher in adhesive, and have free-phenol in adhesive, there is certain pollution to environment.Provide one in CN102010678A and carry out the obtained bio oil-Phenol-starch Resin of polymerization preparation with converted starch, phenol and bio oil, add the starch base crosslinking agent of preparation again, obtain a kind of aldehyde-free cement, containing a certain amount of phenol in this adhesive, have certain pollution to environment; Add oxidant price in starch denaturalization process higher, cause adhesive high expensive.CN101805568A provides one and utilizes starch and bio oil to be primary raw material, carry out complex denaturation to starch to react with exquisite bio oil again, add certain auxiliary agent again, and adopt ethanedioic acid to its esterification, obtain adhesive host, finally add curing agent and obtain can be used for adhesive prepared by aldehyde-free by wood, but this adhesive high expensive and preparation technology is comparatively complicated, be unfavorable for applying.
Summary of the invention
The object of this invention is to provide a kind of method utilizing bio oil starch adhesive to prepare high performance-price ratio aldehyde-free by wood, it is characterized in that the adhesive used in Process of Applying Glue is bio oil starch adhesive, this adhesive primary raw material is renewable, preparation technology is simple, cost is low, storage period is long, the glued board environmental protection prepared with it, and bonding strength reaches the requirement of II class glued board.
A kind of method utilizing bio oil starch adhesive to prepare aldehyde-free by wood that the present invention proposes, the method comprises the following steps:
The first step: prepared by bio oil starch adhesive
(1) pretreatment of raw material: adopt the method for vacuum filtration and decompression distillation to carry out pretreatment to bio oil, by bio oil moisture control 30% ~ 40%; Wild for 25-35 part tapioca is added in 65 ~ 75 parts of water, be mixed with the starch emulsion that mass fraction is 25% ~ 35%, add the concentrated hydrochloric acid 6 ~ 8 parts that mass fraction is 37%, be warmed up to 50 DEG C ~ 60 DEG C, add 0.7 ~ 0.9 part of oxidant persulfate again, reaction 30 ~ 90min, obtained acid hydrolysis oxidative starch emulsion;
(2) bio oil starch adhesive host preparation: add 40 ~ 60 parts of pretreated bio oil in acid hydrolysis oxidative starch emulsion, with mass fraction be 10% sodium hydroxide solution adjust PH to 8 ~ 10, at the temperature of 50 DEG C ~ 60 DEG C, react 30 ~ 50min, then be warming up to 60 DEG C ~ 80 DEG C reaction 40 ~ 60min; Then in 20min, evenly add mass fraction is 10% poly-vinyl alcohol solution 20 ~ 30 parts, alternately add alkali lye and ethanedioic acid every 10min again, so repeatedly operate, until ethanedioic acid adds, being cooled to 50 DEG C, is that 3% hydrochloric acid adjusts pH value to be 7 with mass fraction; Add borax 2.4 ~ 4.8 parts under continuous stirring condition, till viscosity reaches requirement, cooling discharging, obtains bio oil starch adhesive host, for subsequent use;
(3) bio oil starch adhesive modulation: add curing agent PIC 20 ~ 30 parts in the bio oil starch adhesive host of above-mentioned preparation, filler 30 ~ 50 parts, and mix, obtain bio oil starch adhesive;
Second step: prepared by aldehyde-free by wood
Dry the veneers to moisture content 8% ~ 10%, by 260 ~ 300g/m
2glue-spread applying glue, by the adhesive double spread modulated, be uniformly coated on dried veneer; Press odd-level principle and adjacent veneer machine direction is mutually vertical, carry out veneer assembly, and display 10 ~ 30min; Adopt pressure drop stage technological design hot pressing curve (hot-pressing process curve as shown in Figure 1, first rapid pressure, pressurize again, rear point two sections of step-downs, until pressure is zero), be 1.0 ~ 1.2MPa at hot pressing pressure, hot pressing temperature is 110 ~ 130 DEG C, hot pressing time is that 0.8 ~ 1.0min/mm condition presses down glue plywood, obtains the aldehyde-free by wood utilizing bio oil starch adhesive to prepare.
In above-mentioned preparation method, described bio oil is under the condition of isolated air or anoxic, adopt living beings (forest tree castoff, wood chip, agricultural crop straw, bark under the condition of medium reaction temperature (500 ~ 650 DEG C), the high rate of heat addition (103 ~ 105 DEG C/s) and extremely short gas residence time (being less than 2s), shell etc.) carry out the liquid product that thermochemical study obtains, in the present invention, bio oil used is produced by Beijing Forestry University; Starch used is the wild tapioca of inedibility; Oxidant persulfate mass fraction used is 10%, can be any one in ammonium persulfate, potassium peroxydisulfate, sodium peroxydisulfate; Veneer thickness used is 1.5mm, can be obtained by any one in the timber such as poplar, larch, Eucalyptus, birch, Manchurian ash; Filler used can be any one in precipitated calcium carbonate, imvite, bentonite, flour.
The present invention has the following advantages and good effect:
(1) the present invention prepares aldehyde-free by wood adhesive used is on CN101805568A basis, carry out novelty improvement, mainly comprise and select the persulfate of low cost to substitute expensive periodate as oxidant, and adopt more reasonably acid hydrolysis oxidative technique to carry out starch process in early stage, prevent starch molecule excessive degradation, improve starch molecule water-soluble, promote that starch and bio oil are fully reacted, thus improve Adhensive performance; Adopting the method for vacuum filtration simple to operate, cost is low and decompression distillation to substitute, to have solvent loss large, be separated, reclaim the solvent extraction method of the shortcoming such as difficulty and solvent price height, bio oil is processed, reduce the loss of active ingredient in bio oil and improve active ingredient mass fraction in bio oil, thus achieving the efficiency utilization of bio oil; Adopt volatility little and little PIC is polluted to production environment and substitute toluene diisocyanate as curing agent; Under ensureing the prerequisite of plywood character, reduce the consumption of starch and the higher auxiliary agent of price (as curing agent) in adhesive, reduce the cost of adhesive, thus reduce the cost of glued board.To sum up, glued board bio oil starch adhesive preparation technology after improvement is simple, cost is low, environmental protection, the glued board cost prepared with it is low, water-tolerant, bonding strength is high, can meet the requirement of environmental type II class glued board, the burst size of methanal of burst size of methanal and raw material veneer is suitable, achieves the object of " without aldehyde ".
(2) the present invention prepares glued board bio oil starch adhesive is adopt natural wild tapioca and forest and agricultural biomass fast pyrogenation bio oil to be that primary raw material prepares wood adhesive, do not use formaldehyde, not only fundamentally solve the Form aldehyde release problem of glued board, and achieve effective utilization in wild cassava resource and agricultural-forestry biomass goods and materials source;
(3) reaction condition in the present invention needed for bio oil starch adhesive preparation process used is gentle, easy and simple to handle, can stick with glue on agent production equipment implement at existing normal plywood, and three-waste free discharge in production process, not to environment.
(4) glued board cost of the present invention is low, preparation technology simple, to equipment without particular/special requirement, can implement on existing plywood production equipment, is applicable to industrialization promotion on a large scale.
(5) the present invention can be used for the production of the product such as multi-plywood, three-layer real-wood (bamboo, bamboo wood) composite floor board, multi-layer solid wood composite floor, core-board, will produce larger Social benefit and economic benefit after applying.
Accompanying drawing explanation
Fig. 1 is plywood hot-pressing process curve figure of the present invention.
Detailed description of the invention
A kind of method utilizing bio oil starch adhesive to prepare aldehyde-free by wood that the present invention proposes, the method comprises the following steps:
The first step: prepared by bio oil starch adhesive:
(1) pretreatment of raw material: adopt the method for vacuum filtration and decompression distillation to carry out pretreatment to bio oil, by bio oil moisture control 30% ~ 40%; Wild for 25-35 part tapioca is added in 65 ~ 75 parts of water, be mixed with the starch emulsion that mass fraction is 25% ~ 35%, add the concentrated hydrochloric acid 6 ~ 8 parts that mass fraction is 37%, be warmed up to 50 DEG C ~ 60 DEG C, add 0.7 ~ 0.9 part of oxidant persulfate again, reaction 30 ~ 90min, obtained acid hydrolysis oxidative starch emulsion; (2) bio oil starch adhesive host preparation: add pretreated 40 ~ 60 parts of bio oil in the starch emulsion of acid hydrolysis oxidative, with mass fraction be 10% sodium hydroxide solution adjust PH to 8 ~ 10, at the temperature of 50 DEG C ~ 60 DEG C, react 30 ~ 50min, then be warming up to 60 DEG C ~ 80 DEG C reaction 40 ~ 60min; Then in 20min, evenly add mass fraction is 10% poly-vinyl alcohol solution 20 ~ 30 parts, alternately add alkali lye and ethanedioic acid every 10min again, so repeatedly operate, until ethanedioic acid adds, being cooled to 50 DEG C, is that 3% hydrochloric acid adjusts pH value to be 7 with mass fraction; Add borax 2.4 ~ 4.8 parts under continuous stirring condition, till viscosity reaches requirement, cooling discharging, obtains bio oil starch adhesive host, for subsequent use; (3) bio oil starch adhesive modulation: add curing agent PIC 20 ~ 30 parts in the bio oil starch adhesive host of above-mentioned preparation, filler 30 ~ 50 parts, and mix, obtained bio oil starch adhesive.
Second step: prepared by aldehyde-free by wood: dry the veneers to moisture content 8% ~ 10%, by 260 ~ 300g/m
2glue-spread applying glue, by the adhesive double spread modulated, be uniformly coated on dried veneer; Press odd-level principle and adjacent veneer machine direction is mutually vertical, carry out veneer assembly, and display 10 ~ 30min; (as shown in Figure 1, first rapid pressure, then pressurize, rear point two sections of step-downs, until pressure is zero to hot-pressing process curve to adopt pressure drop stage technological design hot pressing curve.), be 1.0 ~ 1.2MPa at hot pressing pressure, hot pressing temperature is 110 ~ 130 DEG C, and hot pressing time is that 0.8 ~ 1.0min/mm condition presses down glue plywood, obtains the aldehyde-free by wood utilizing bio oil starch adhesive to prepare.
In above-mentioned preparation method, described bio oil is under the condition of isolated air or anoxic, adopt living beings (forest tree castoff, wood chip, agricultural crop straw, bark under the condition of medium reaction temperature (500 ~ 650 DEG C), the high rate of heat addition (103 ~ 105 DEG C/s) and extremely short gas residence time (being less than 2s), shell etc.) carry out the liquid product that thermochemical study obtains, in the present invention, bio oil used is produced by Beijing Forestry University; Starch used is the wild tapioca of inedibility; Oxidant persulfate mass fraction used is 10%, can be any one in ammonium persulfate, potassium peroxydisulfate, sodium peroxydisulfate; Veneer thickness used is 1.5mm, can be obtained by any one in the timber such as poplar, larch, Eucalyptus, birch, Manchurian ash; Filler used can be any one in precipitated calcium carbonate, imvite, bentonite, flour.
In above-mentioned preparation method's first step, each material every part is same mass unit.
Embodiment 1
The first step: prepared by bio oil starch adhesive: (1) pretreatment of raw material: adopt the method for vacuum filtration and decompression distillation to carry out pretreatment to bio oil, by bio oil moisture control 30%; 25 portions of wild tapiocas are joined 75 parts of water, is mixed with the starch emulsion that mass fraction is 25%, add the concentrated hydrochloric acid 6 parts that mass fraction is 37%, be warmed up to 50 DEG C, add 0.7 part of oxidant ammonium persulfate again, reaction 30min, obtained acid hydrolysis oxidative starch emulsion; (2) bio oil starch adhesive host preparation: add 40 parts of bio oil in the starch emulsion of acid hydrolysis oxidative, is that 10% sodium hydroxide solution adjusts PH to 8 with mass fraction, reacts 30min, then be warming up to 60 DEG C of DEG C of reaction 40min at the temperature of 50 DEG C; Then in 20min, evenly add mass fraction is 10% poly-vinyl alcohol solution 20 parts, more alternately adds alkali lye and ethanedioic acid every 10min, so repeatedly operates, until ethanedioic acid adds, is cooled to 50 DEG C, is that 3% hydrochloric acid adjusts pH value to be 7 with mass fraction; Add borax 2.4 parts under continuous stirring condition, till viscosity reaches requirement, cooling discharging, obtains bio oil starch adhesive host, for subsequent use; (3) bio oil starch adhesive modulation: add curing agent PIC 20 parts in the bio oil starch adhesive host of above-mentioned preparation, filler precipitated calcium carbonate 30 parts, and mix, obtained bio oil starch adhesive.
Second step: prepared by aldehyde-free by wood: board using poplar board is dried to moisture content 8%%, by 260g/m
2glue-spread applying glue, by the adhesive double spread modulated, be uniformly coated on dried veneer; Press odd-level principle and adjacent veneer machine direction is mutually vertical, carry out veneer assembly, and display 10min; Adopt pressure drop stage technological design hot pressing curve, be 1.0MPa at hot pressing pressure, hot pressing temperature is 110 DEG C, and hot pressing time is under 0.8min/mm condition, utilizes bio oil starch adhesive to prepare three layers of poplar plywood.
Embodiment 2
The first step: prepared by bio oil starch adhesive: (1) pretreatment of raw material: adopt the method for vacuum filtration and decompression distillation to carry out pretreatment to bio oil, by bio oil moisture control 35%; 30 portions of wild tapiocas are joined 70 parts of water, is mixed with the starch emulsion that mass fraction is 30%, add the concentrated hydrochloric acid 7 parts that mass fraction is 37%, be warmed up to 55 DEG C, add 0.8 part of oxidant potassium peroxydisulfate again, reaction 60min, obtained acid hydrolysis oxidative starch emulsion; (2) bio oil starch adhesive host preparation: add 50 parts of bio oil in the starch emulsion of acid hydrolysis oxidative, is that 10% sodium hydroxide solution adjusts PH to 9 with mass fraction, reacts 40min, then be warming up to 70 DEG C of reaction 50min at the temperature of 55 DEG C; Then in 20min, evenly add mass fraction is 10% poly-vinyl alcohol solution 25 parts, more alternately adds alkali lye and ethanedioic acid every 10min, so repeatedly operates, until ethanedioic acid adds, is cooled to 50 DEG C, is that 3% hydrochloric acid adjusts pH value to be 7 with mass fraction; Add borax 3.6 parts under continuous stirring condition, till viscosity reaches requirement, cooling discharging, obtains bio oil starch adhesive host, for subsequent use; (3) bio oil starch adhesive modulation: add curing agent PIC 25 parts in the bio oil starch adhesive host of above-mentioned preparation, filler imvite 40 parts, and mix, obtained bio oil starch adhesive.
Second step: prepared by aldehyde-free by wood: board using poplar board is dried to moisture content 9%, by 280g/m
2glue-spread applying glue, by the adhesive double spread modulated, be uniformly coated on dried veneer; Press odd-level principle and adjacent veneer machine direction is mutually vertical, carry out veneer assembly, and display 20min; Adopt pressure drop stage technological design hot pressing curve, be 1.1MPa at hot pressing pressure, hot pressing temperature is 120 DEG C, and hot pressing time is under 0.9min/mm condition, utilizes bio oil starch adhesive to prepare three layers of poplar plywood.
Embodiment 3
The first step: prepared by bio oil starch adhesive: (1) pretreatment of raw material: adopt the method for vacuum filtration and decompression distillation to carry out pretreatment to bio oil, by bio oil moisture control 40%; 35 portions of wild tapiocas are joined 65 parts of water, is mixed with the starch emulsion that mass fraction is 35%, add the concentrated hydrochloric acid 8 parts that mass fraction is 37%, be warmed up to 60 DEG C, add 0.9 part of oxidant sodium peroxydisulfate again, reaction 90min, obtained acid hydrolysis oxidative starch emulsion; (2) bio oil starch adhesive host preparation: add 60 parts of bio oil in the starch emulsion of acid hydrolysis oxidative, is that 10% sodium hydroxide solution adjusts PH to 10 with mass fraction, reacts 50min, then be warming up to 80 DEG C of reaction 60min at the temperature of 60 DEG C; Then in 20min, evenly add mass fraction is 10% poly-vinyl alcohol solution 30 parts, more alternately adds alkali lye and ethanedioic acid every 10min, so repeatedly operates, until ethanedioic acid adds, is cooled to 50 DEG C, is that 3% hydrochloric acid adjusts pH value to be 7 with mass fraction; Add borax 4.8 parts under continuous stirring condition, till viscosity reaches requirement, cooling discharging, obtains bio oil starch adhesive host, for subsequent use; (3) bio oil starch adhesive modulation: add curing agent PIC 30 parts in the bio oil starch adhesive host of above-mentioned preparation, filler bentonite 50 parts, and mix, obtained bio oil starch adhesive.
Second step: prepared by aldehyde-free by wood: board using poplar board is dried to moisture content 10%, by 300g/m
2glue-spread applying glue, by the adhesive double spread modulated, be uniformly coated on dried veneer; Press odd-level principle and adjacent veneer machine direction is mutually vertical, carry out veneer assembly, and display 30min; Adopt pressure drop stage technological design hot pressing curve, be 1.2MPa at hot pressing pressure, hot pressing temperature is 130 DEG C, and hot pressing time is under 1.0min/mm condition, utilizes bio oil starch adhesive to prepare three layers of poplar plywood.
Embodiment 4
The first step: prepared by bio oil starch adhesive: (1) pretreatment of raw material: adopt the method for vacuum filtration and decompression distillation to carry out pretreatment to bio oil, by bio oil moisture control 35%; 30 portions of wild tapiocas are joined 70 parts of water, is mixed with the starch emulsion that mass fraction is 30%, add the concentrated hydrochloric acid 7 parts that mass fraction is 37%, be warmed up to 55 DEG C, add 0.8 part of oxidant potassium peroxydisulfate again, reaction 60min, obtained acid hydrolysis oxidative starch emulsion; (2) bio oil starch adhesive host preparation: add 50 parts of bio oil in the starch emulsion of acid hydrolysis oxidative, is that 10% sodium hydroxide solution adjusts PH to 9 with mass fraction, reacts 40min, then be warming up to 70 DEG C of reaction 50min at the temperature of 55 DEG C; Then in 20min, evenly add mass fraction is 10% poly-vinyl alcohol solution 25 parts, more alternately adds alkali lye and ethanedioic acid every 10min, so repeatedly operates, until ethanedioic acid adds, is cooled to 50 DEG C, is that 3% hydrochloric acid adjusts pH value to be 7 with mass fraction; Add borax 3.6 parts under continuous stirring condition, till viscosity reaches requirement, cooling discharging, obtains bio oil starch adhesive host, for subsequent use; (3) bio oil starch adhesive modulation: add curing agent PIC 25 parts in the bio oil starch adhesive host of above-mentioned preparation, 40 parts, filler flour, and mix, obtained bio oil starch adhesive.
Second step: prepared by aldehyde-free by wood: board using poplar board is dried to moisture content 9%, by 280g/m
2glue-spread applying glue, by the adhesive double spread modulated, be uniformly coated on dried veneer; Press odd-level principle and adjacent veneer machine direction is mutually vertical, carry out veneer assembly, and display 20min; Adopt pressure drop stage technological design hot pressing curve, be 1.1MPa at hot pressing pressure, hot pressing temperature is 120 DEG C, and hot pressing time is under 0.9min/mm condition, utilizes bio oil starch adhesive to prepare three layers of poplar plywood.
Embodiment 5
Be except larch veneer except preparing glued board veneer, other technological parameter is with embodiment 4.
Embodiment 6
Be except Eucalyptus veneer except preparing glued board veneer, other technological parameter is with embodiment 4.
Embodiment 7
Be except birch veneer except preparing glued board veneer, other technological parameter is with embodiment 4.
Embodiment 8
Be except fraxinus mandshurica veneer except preparing glued board veneer, other technological parameter is with embodiment 4.
Three layers of glued board prepared by embodiment 1-8 detect its quality index according to standard GB/T/T 9846.3-2004 " normal plywood general technical specifications ", and test specimen processes by the requirement of II class glued board, and testing result as shown in appendix 1.As can be seen from Table 1, the bonding strength of glued board is all higher than II class National Standards for Plywood; Burst size of methanal is far below EO grade standard, and suitable with the burst size of methanal of raw material veneer, achieves the object of " without aldehyde ".
Subordinate list 1
Claims (4)
1. utilize bio oil starch adhesive to prepare a method for aldehyde-free by wood, it is characterized in that, the method comprises the following steps:
The first step: prepared by bio oil starch adhesive
(1) pretreatment of raw material: adopt the method for vacuum filtration and decompression distillation to carry out pretreatment to bio oil, by bio oil moisture control 30% ~ 40%; Wild for 25-35 part tapioca is added in 65 ~ 75 parts of water, be mixed with the starch emulsion that mass fraction is 25% ~ 35%, add the concentrated hydrochloric acid 6 ~ 8 parts that mass fraction is 37%, be warmed up to 50 DEG C ~ 60 DEG C, add 0.7 ~ 0.9 part of oxidant persulfate again, reaction 30 ~ 90min, obtained acid hydrolysis oxidative starch emulsion;
(2) bio oil starch adhesive host preparation: add 40 ~ 60 parts of pretreated bio oil in acid hydrolysis oxidative starch emulsion, with mass fraction be 10% sodium hydroxide solution adjust PH to 8 ~ 10, at the temperature of 50 DEG C ~ 60 DEG C, react 30 ~ 50min, then be warming up to 60 DEG C ~ 80 DEG C reaction 40 ~ 60min; Then in 20min, evenly add mass fraction is 10% poly-vinyl alcohol solution 20 ~ 30 parts, alternately add alkali lye and ethanedioic acid every 10min again, so repeatedly operate, until ethanedioic acid adds, being cooled to 50 DEG C, is that 3% hydrochloric acid adjusts pH value to be 7 with mass fraction; Add borax 2.4 ~ 4.8 parts under continuous stirring condition, till viscosity reaches requirement, cooling discharging, obtains bio oil starch adhesive host, for subsequent use;
(3) bio oil starch adhesive modulation: add curing agent PIC 20 ~ 30 parts in the bio oil starch adhesive host of above-mentioned preparation, filler 30 ~ 50 parts, and mix, obtain bio oil starch adhesive;
Second step: prepared by aldehyde-free by wood
Dry the veneers to moisture content 8% ~ 10%, by 260 ~ 300g/m
2glue-spread applying glue, by the adhesive double spread modulated, be uniformly coated on dried veneer; Press odd-level principle and adjacent veneer machine direction is mutually vertical, carry out veneer assembly, and display 10 ~ 30min; Adopt pressure drop stage technological design hot pressing curve (hot-pressing process curve as shown in Figure 1, first rapid pressure, pressurize again, rear point two sections of step-downs, until pressure is zero), be 1.0 ~ 1.2MPa at hot pressing pressure, hot pressing temperature is 110 ~ 130 DEG C, hot pressing time is that 0.8 ~ 1.0min/mm condition presses down glue plywood, obtains the aldehyde-free by wood utilizing bio oil starch adhesive to prepare.
2. method as claimed in claim 1, it is characterized in that, bio oil in described step 1) is under the condition of isolated air or anoxic, under the condition of the high rate of heat addition adopting the medium reaction temperature of 500 ~ 650 DEG C, 103 ~ 105 DEG C/s and the extremely short gas residence time that is less than 2s, living beings is carried out the liquid product that thermochemical study obtains.
3. method as claimed in claim 1, is characterized in that, (1) the oxidant persulfate used mass fraction in the described first step is ammonium persulfate, potassium peroxydisulfate, any one in sodium peroxydisulfate of 10%.
4. method as claimed in claim 1, is characterized in that, (3) filler used in the described first step is any one in precipitated calcium carbonate, imvite, bentonite, flour.
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| CN103122228B (en) * | 2013-03-01 | 2014-12-10 | 北京林业大学 | Bio-oil starch adhesive for wood and preparation method |
| CN103540276A (en) * | 2013-09-29 | 2014-01-29 | 安徽华印机电股份有限公司 | Preparation method of potato starch adhesive and application of adhesive |
| CN104910839B (en) * | 2015-06-16 | 2017-02-01 | 北京林业大学 | Regulation and control method for preparation process for bio-oil starch adhesive for wood |
| CN105382889A (en) * | 2016-01-22 | 2016-03-09 | 栾金榜 | Hot pressing process for plywood |
| CN105965616B (en) * | 2016-02-03 | 2019-04-23 | 宁波中加低碳新技术研究院有限公司 | The manufacturing method of veneer base composite board |
| CN107053423B (en) * | 2016-07-15 | 2019-06-14 | 毛忠晋 | A kind of production method and application of plant fine powder |
| CN107699160A (en) * | 2017-07-03 | 2018-02-16 | 河北力卓生物科技有限公司 | A kind of artificial board gluing powder and its preparation technology |
| CN109203171A (en) * | 2018-09-28 | 2019-01-15 | 成都市荣胜木业有限公司 | A kind of composite board and its once hot pressing technique |
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| CN1189406A (en) * | 1997-01-29 | 1998-08-05 | 赵仁杰 | Improved mfg. process of compound plastic bamboo plywood |
| CN101264614A (en) * | 2007-03-15 | 2008-09-17 | 湖北康欣木制品有限公司 | Wood veneer for container bottom board and producing method thereof |
| CN101508124B (en) * | 2009-03-10 | 2011-01-05 | 杨湘云 | Preparation method of plywood for full-bamboo or bamboo wood composite container |
| CN101805568A (en) * | 2010-03-08 | 2010-08-18 | 北京林业大学 | Bio oil-starch adhesive and preparation method thereof |
| CN102010678A (en) * | 2010-09-30 | 2011-04-13 | 北京林业大学 | Preparation method for biological oil-phenol-starch adhesive |
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