CN100491088C - Poplar single ply intensifier and its method for intensifying poplar single ply - Google Patents
Poplar single ply intensifier and its method for intensifying poplar single ply Download PDFInfo
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- CN100491088C CN100491088C CN 200710071953 CN200710071953A CN100491088C CN 100491088 C CN100491088 C CN 100491088C CN 200710071953 CN200710071953 CN 200710071953 CN 200710071953 A CN200710071953 A CN 200710071953A CN 100491088 C CN100491088 C CN 100491088C
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Abstract
The present invention is poplar single ply intensifier and the method of intensifying poplar single ply therewith. The poplar single ply intensifier is prepared with styrene 24-26 weight portions, methyl methacrylate 48-52 weight portions, vinyl acetate 24-26 weight portions, 2azo diisobutyronitrile 2.8-3 weight portions, cobalt naphthenate 1.8-2.2 weight portions and zinc chloride 5.8-6.2 weight portions. The method of intensifying poplar single ply with the intensifier includes the following steps: preparing the intensifier, soaking poplar single ply inside the intensifier, sealing and pressurizing, ageing, and heating before drying. The present invention can raise the surface hardness of poplar single ply by 1.34-2.55 times, wear resistance by 2.35 times and static bending strength by 1.87-2.96 times.
Description
Technical field
The present invention relates to the method for a kind of timber hardening agent and reinforced timber thereof.
Background technology
Along with the stable development of China's economy, consumption demand constantly increases to timber for industrial production and people's lives, and the present timber yield of China is in quality with quantitatively all can't satisfy the demands.Every year has been built a large amount of artificial forest in recent ten years by China, and 3,400 ten thousand hectares of accumulative total artificial forest areas are first of the world.Willow is wide, wide in variety with its distribution, fast growth, adaptive capacity are strong etc., and characteristics become one of topmost quick-growing plantation seeds of China, China's Poplar Plantation gross area has reached more than 700 ten thousand hectares according to statistics, rank first in the world, surpass the summation of other countries' Poplar Plantation area.China's willow Timber stands area is 3,090,000 hectares, account for about 40% of national Poplar Plantation area, and growth of poplar speed just can be become a useful person soon in 6～8 years, but because shortcoming such as the thick pine of soft, the structure of poplar material, intensity be low, can only be used for pulpwood and glued board core, limited to the extensive, efficient of poplar and utilized, the present situation of wood supply anxiety is not eased yet.
Summary of the invention
The present situation that the objective of the invention is shortcomings such as the poplar material is soft in order to solve, structure is slightly loose, intensity is low and alleviation wood supply anxiety, and the method for a kind of strengthened poplar veneer agent that provides and reinforcement board using poplar board thereof.The strengthened poplar veneer agent is made by 24～26 parts of styrene, 48～52 parts of methyl methacrylates, 24～26 parts of vinylacetates, 2.8～3.2 parts of azodiisobutyronitriles, 1.8～2.2 parts of cobalt naphthenates and 5.8～6.2 parts of zinc chloride by ratio of quality and the number of copies.Above-mentioned strengthened poplar veneer agent is strengthened the method for board using poplar board and carried out according to the following steps: (one) together evenly stirs 24～26 parts of styrene, 48～52 parts of methyl methacrylates, 24～26 parts of vinylacetates, 2.8～3.2 parts of azodiisobutyronitriles, 1.8～2.2 parts of cobalt naphthenates and 5.8～6.2 parts of zinc chloride, makes the strengthened poplar veneer agent; (2) be immersed in board using poplar board in the hardening agent and place pressurized tank to seal; (3) board using poplar board that is immersed in hardening agent in the pressurized tank is applied pressure 60 ± 2min of 0.38～0.45MPa, then at condition of normal pressure lower seal 2 ± 0.1h; (4) take out board using poplar board and inhale the hardening agent that goes to the surface, display 36 ± 1h with the polyethylene film parcel again; (5) will be through displaying, put into 80 ± 2 ℃ environment with the board using poplar board of polyethylene film parcel and heat 6 ± 0.1h, and then put into vacuum drying chamber inner drying 2～3h of 20 ± 0.1 ℃, promptly obtain board using poplar board through strengthening.
Strengthened poplar veneer agent proportioning is simple among the present invention, can effectively strengthen the board using poplar board mechanical property, and the board using poplar board case hardness of strengthening through hardening agent has improved 1.34～2.55 times, and wearability has improved more than 2.35 times, and MOR has improved 1.87～2.96 times.
The equipment that the present invention strengthens board using poplar board requires low, and method is simple, and operating parameter is easy to control.The present invention strengthens board using poplar board with the method for hardening agent dipping, heated polymerizable, solved the problem that hardening agent impregnates the solid wood difficulty, and overcome the intrinsic natural defect of poplar, strengthen the board using poplar board mechanical property, thereby improve the efficient utilization of poplar, enlarge the range of application of quick-growing plantation, realize the excellent usefulness of bad material, alleviated the timber resources shortage, the situation that disparities between supply and demand become increasingly conspicuous has great economic and social benefit.
Description of drawings
Fig. 1 is the conversion ratio of unsaturated ethylene vinyl monomer behind the adding different proportion azodiisobutyronitrile, and Fig. 2 is the conversion ratio of unsaturated ethylene vinyl monomer behind the adding different proportion cobalt naphthenate, and Fig. 3 is the conversion ratio of unsaturated ethylene vinyl monomer behind the adding different proportion zinc chloride.
The specific embodiment
The specific embodiment one: the agent of present embodiment strengthened poplar veneer is made by 24～26 parts of styrene, 48～52 parts of methyl methacrylates, 24～26 parts of vinylacetates, 2.8～3.2 parts of azodiisobutyronitriles, 1.8～2.2 parts of cobalt naphthenates and 5.8～6.2 parts of zinc chloride by ratio of quality and the number of copies.
Azodiisobutyronitrile in the present embodiment (AIBN) uses as initator, and azodiisobutyronitrile easily resolves into the compound of free radical, and fierce the decomposition, reaction speed is accelerated in 80～90 ℃ of environment, and decomposition reaction is as follows:
The decomposition characteristics of azodiisobutyronitrile are almost all to be first order reaction, only form a kind of free radical, do not have and induce decomposition, having under unsaturated ethylene vinyl monomer (styrene, methyl methacrylate and the vinylacetate) existence condition is initiated polymerization, so azodiisobutyronitrile is under low relatively heating-up temperature, the free radical of generation causes unsaturated ethylene vinyl monomer self and unsaturated ethylene vinyl monomer polymerisation each other.
Poplar is made up of lignin, cellulose and hemicellulose, therefore lignin in the poplar and styrene generation graft copolymerization under the initator effect, and reaction equation is as follows:
, lignin mainly is present in the broad-leaved wood with the building stone of lignum-vitae base propane and lilac base propane, in these construction unit polymerisations can with styrene generation graft copolymerization; And the apparent certain polarity of styrene, to the lignin structure that mainly plays the hardness effect in the poplar is similar benzene ring structure is arranged, so can improve the hardness of poplar after styrene and the poplar polymerization.
Methyl methacrylate (MMA) molecule contains polar group, has compatibility preferably with lignin.The while methyl methacrylate contains ester bond can combine the big molecule of formation copolymer with the cellulose in the poplar, the hydroxyl on the hemicellulose, promptly realizes glycerol polymerization, thereby improves the rigidity of poplar.Improve board using poplar board intensity so choose methyl methacrylate as comonomer.
Under the effect of heating and initator (azodiisobutyronitrile), copolyreaction takes place in three kinds of unsaturated ethylene vinyl monomers (styrene, methyl methacrylate and vinylacetate) in the present embodiment each other, has produced multiple mixed system and multiple complicated copolymer by monomer self or mutual copolymerization.Cobalt naphthenate and zinc chloride act synergistically as promoter in the present embodiment, have accelerated the speed of copolyreaction, and have improved the conversion ratio of monomer.Under the synergy of multiple mixed system and multiple complicated copolymer, board using poplar board forms desirable complex, and comprehensive mechanical property significantly improves, and the case hardness of board using poplar board has improved 1.34～2.55 times, wearability has improved more than 2.35 times, and MOR has improved 1.87～2.96 times.
The specific embodiment two: the difference of the present embodiment and the specific embodiment one is: the strengthened poplar veneer agent is made by 25 parts of styrene, 50 parts of methyl methacrylates, 25 parts of vinylacetates, 3 parts of azodiisobutyronitriles, 2 parts of cobalt naphthenates and 6 parts of zinc chloride by ratio of quality and the number of copies.
The specific embodiment three: present embodiment is strengthened the method for board using poplar board and carried out according to the following steps: (one) together evenly stirs 24～26 parts of styrene, 48～52 parts of methyl methacrylates, 24～26 parts of vinylacetates, 2.8～3.2 parts of azodiisobutyronitriles, 1.8～2.2 parts of cobalt naphthenates and 5.8～6.2 parts of zinc chloride, makes the strengthened poplar veneer agent; (2) be immersed in board using poplar board in the hardening agent and place pressurized tank to seal; (3) board using poplar board that is immersed in hardening agent in the pressurized tank is applied pressure 60 ± 2min of 0.38～0.45MPa, then at condition of normal pressure lower seal 2 ± 0.1h; (4) take out board using poplar board and inhale the hardening agent that goes to the surface, display 36 ± 1h with the polyethylene film parcel again; (5) will be through displaying, put into 80 ± 2 ℃ environment with the board using poplar board of polyethylene film parcel and heat 6 ± 0.1h, and then put into vacuum drying chamber inner drying 2～3h of 20 ± 0.1 ℃, promptly obtain board using poplar board through strengthening.
Present embodiment is measured particieboard with reference to standard GB/T4897-92 " particieboard " and is made the reinforcement composite wood of base material and the MOR of material composite plate; Measure medium density fibre board (MDF) with reference to the method for 4.9 regulations among standard GB/T17657-1999 and make the reinforcement composite wood of base material and the MOR of material composite plate.Measure case hardness and the wearability that the three-type-person makes plate substrate (glued board is made base material, base material made by particieboard and medium-density plate is made base material) intensive treatment front and back sheet material respectively with reference to standard GB/T17657-1999 " Test methods of evaluating the properties of woodbased panels and surface decorated woodbased panels ".Testing result is as shown in table 1.
Table 1
After present embodiment was strengthened, its case hardness had improved 2.28 times to experimental data explanation glued board as the composite board of base material, and wearability has improved 2.35 times; After present embodiment was strengthened, case hardness had improved 2.25 times to particieboard as the composite board of base material, and wearability has improved 2.35 times, and MOR has improved 2.83 times; After present embodiment was strengthened, case hardness had improved 1.34 times to medium-density plate as the composite board of base material, and wearability has improved 2.35 times, and MOR has improved 1.87 times.
The specific embodiment four: the difference of the present embodiment and the specific embodiment three is: step () together evenly stirs 25 parts of styrene, 50 parts of methyl methacrylates, 25 parts of vinylacetates, 3 parts of azodiisobutyronitriles, 2 parts of cobalt naphthenates and 6 parts of zinc chloride, makes the strengthened poplar veneer agent.Other step is identical with embodiment three.
The contrast experiment:
1, measures styrene, methyl methacrylate and vinylacetate different quality proportioning heat unsaturated ethylene vinyl monomer behind the 6h in 80 ℃ environment conversion ratio, measurement result (except that styrene, methyl methacrylate were different with vinylacetate quality proportioning, other experiment condition was all identical) as shown in table 2.
Table 2
The mass ratio of experimental data explanation styrene, methyl methacrylate and vinylacetate is that unsaturated ethylene class monomer conversion is up to 51.96% under 1: 2: 1 the condition.
His-and-hers watches 2 experimental datas are carried out variance analysis, and The results of analysis of variance is as shown in table 3, and styrene, methyl methacrylate mix by different proportion with vinylacetate and to strengthening the board using poplar board monomer conversion highly significant influence arranged as can be known by The results of analysis of variance.The mass ratio of styrene, methyl methacrylate and vinylacetate is that 1: 2: 1 conversion ratio is the highest.
Table 3
Annotate: F
0.05(6,35)=2.38 F
001(6,35)=3.3
2, under the identical situation of other condition, the addition of azodiisobutyronitrile (azodiisobutyronitrile accounts for the percentage of 3 kinds of unsaturated ethylene vinyl monomer gross masses) to the influence of monomer conversion as shown in Figure 1, illustrate to add the azodiisobutyronitrile that accounts for styrene, methyl methacrylate and vinylacetate gross mass 3%, the conversion ratio of unsaturated ethylene vinyl monomer is the highest.
3, under the identical situation of other condition, the addition of cobalt naphthenate (cobalt naphthenate accounts for the percentage of 3 kinds of unsaturated ethylene vinyl monomer gross masses) to the influence of monomer conversion as shown in Figure 2, illustrate to add the cobalt naphthenate that accounts for styrene, methyl methacrylate and vinylacetate gross mass 2%, the conversion ratio of unsaturated ethylene vinyl monomer is the highest.
4, under the identical situation of other condition, the addition of zinc chloride (zinc chloride accounts for the percentage of 3 kinds of unsaturated ethylene vinyl monomer gross masses) to the influence of monomer conversion as shown in Figure 3, illustrate to add the zinc chloride that accounts for styrene, methyl methacrylate and vinylacetate gross mass 6%, the conversion ratio of unsaturated ethylene vinyl monomer is the highest.
The specific embodiment five: the difference of the present embodiment and the specific embodiment three is: step (three) applies the pressure 60min of 0.4MPa to the board using poplar board that is immersed in hardening agent in the pressurized tank, and then at condition of normal pressure lower seal 2h.Other step is identical with embodiment three.
The specific embodiment six: the difference of the present embodiment and the specific embodiment three is: inhale the board using poplar board that removes surface hardening agent in the step (four) and display 36h with the polyethylene film parcel.Other step and selected parameter are identical with embodiment three.
The specific embodiment seven: the difference of the present embodiment and the specific embodiment three is: inhale the hardening agent that goes to the board using poplar board surface with inhaling the paper cotton in the step (four).Other step and selected parameter are identical with embodiment three.
The specific embodiment eight: the difference of the present embodiment and the specific embodiment three is: the board using poplar board in the step (five) is put into 80 ℃ environment and is heated 6h, and then puts into vacuum drying chamber inner drying 2.2～2.8h of 20 ± 1 ℃.Other step and selected parameter are identical with embodiment three.
Claims (8)
1, a kind of strengthened poplar veneer agent is characterized in that the strengthened poplar veneer agent made by 24～26 parts of styrene, 48～52 parts of methyl methacrylates, 24～26 parts of vinylacetates, 2.8～3.2 parts of azodiisobutyronitriles, 1.8～2.2 parts of cobalt naphthenates and 5.8～6.2 parts of zinc chloride by ratio of quality and the number of copies.
2, a kind of strengthened poplar veneer agent according to claim 1 is characterized in that the strengthened poplar veneer agent made by 25 parts of styrene, 50 parts of methyl methacrylates, 25 parts of vinylacetates, 3 parts of azodiisobutyronitriles, 2 parts of cobalt naphthenates and 6 parts of zinc chloride by ratio of quality and the number of copies.
3, strengthen the method for board using poplar board with the described strengthened poplar veneer agent of claim 1, it is characterized in that the method for strengthening board using poplar board carries out according to the following steps: (one) together evenly stirs 24～26 parts of styrene, 48～52 parts of methyl methacrylates, 24～26 parts of vinylacetates, 2.8～3.2 parts of azodiisobutyronitriles, 1.8～2.2 parts of cobalt naphthenates and 5.8～6.2 parts of zinc chloride, makes the strengthened poplar veneer agent; (2) be immersed in board using poplar board in the hardening agent and place pressurized tank to seal; (3) board using poplar board that is immersed in hardening agent in the pressurized tank is applied pressure 60 ± 2min of 0.38～0.45MPa, then at condition of normal pressure lower seal 2 ± 0.1h; (4) take out board using poplar board and inhale the hardening agent that goes to the surface, display 36 ± 1h with the polyethylene film parcel again; (5) will be through displaying, put into 80 ± 2 ℃ environment with the board using poplar board of polyethylene film parcel and heat 6 ± 0.1h, and then put into vacuum drying chamber inner drying 2～3h of 20 ± 0.1 ℃, promptly obtain board using poplar board through strengthening.
4, the method for board using poplar board is strengthened in strengthened poplar veneer agent according to claim 3, it is characterized in that step () together evenly stirs 25 parts of styrene, 50 parts of methyl methacrylates, 25 parts of vinylacetates, 3 parts of azodiisobutyronitriles, 2 parts of cobalt naphthenates and 6 parts of zinc chloride, makes the strengthened poplar veneer agent.
5, the method for board using poplar board is strengthened in strengthened poplar veneer agent according to claim 3, it is characterized in that step (three) applies the pressure 60min of 0.4MPa to the board using poplar board that is immersed in hardening agent in the pressurized tank, and then at condition of normal pressure lower seal 2h.
6, the method for board using poplar board is strengthened in strengthened poplar veneer agent according to claim 3, it is characterized in that inhaling in the step (four) board using poplar board that removes surface hardening agent and displays 36h with the polyethylene film parcel.
7, the method for board using poplar board is strengthened in strengthened poplar veneer agent according to claim 3, it is characterized in that in the step (four) with inhaling the cotton hardening agent that goes to the board using poplar board surface of inhaling of paper.
8, the method for board using poplar board is strengthened in strengthened poplar veneer agent according to claim 3, it is characterized in that board using poplar board in the step (five) puts into 80 ℃ environment and heat 6h, and then puts into vacuum drying chamber inner drying 2.2～2.8h of 20 ± 1 ℃.
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| CN 200710071953 CN100491088C (en) | 2007-03-28 | 2007-03-28 | Poplar single ply intensifier and its method for intensifying poplar single ply |
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| CN 200710071953 CN100491088C (en) | 2007-03-28 | 2007-03-28 | Poplar single ply intensifier and its method for intensifying poplar single ply |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102152550A (en) * | 2010-12-13 | 2011-08-17 | 东北林业大学 | Method for preparing overlaid artificial board composite material of functional polymerizing monomer modified wooden veneer |
| CN102490219A (en) * | 2011-12-07 | 2012-06-13 | 东北林业大学 | Method for preparing strengthened poplar composite material |
| US20150174786A1 (en) * | 2013-12-20 | 2015-06-25 | Armstrong World Industries, Inc. | Wood products impregnated with monomer based compositions |
| CN103934874B (en) * | 2014-05-05 | 2015-04-08 | 付成永 | Poplar environment-friendly furniture and manufacturing method thereof |
| CN104497242B (en) * | 2014-12-12 | 2017-01-04 | 北华大学 | The method of preparation Changbai Mountain smelly pine laminated timber hardening agent |
| CN107127849A (en) * | 2017-05-18 | 2017-09-05 | 阜南县星光工艺品有限公司 | A kind of method for eliminating the deformation of Manchurian ash timber |
| CN107471363A (en) * | 2017-09-19 | 2017-12-15 | 阜南县金威工艺品有限公司 | A kind of method for lifting timber wire-drawing effect |
| CN108058250A (en) * | 2017-12-21 | 2018-05-22 | 安徽明豪实木家俱有限公司 | A kind of method of modifying for cotton wood |
| CN108818815B (en) * | 2018-07-11 | 2021-05-25 | 广州精点高分子材料制品有限公司 | Ceramic wood based on chemical bond crosslinking and manufacturing method thereof |
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