CN1151912C - Artifical forest soft wood surface compacting metho dand products thereof - Google Patents
Artifical forest soft wood surface compacting metho dand products thereof Download PDFInfo
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- CN1151912C CN1151912C CNB00120758XA CN00120758A CN1151912C CN 1151912 C CN1151912 C CN 1151912C CN B00120758X A CNB00120758X A CN B00120758XA CN 00120758 A CN00120758 A CN 00120758A CN 1151912 C CN1151912 C CN 1151912C
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Abstract
The present invention discloses a method for densifying the surface of artificial forest soft wood and a manufacture product. The method orderly comprises the following steps that a sample is taken and is put in a closed container; the sample is vacuumed so as to reach the atmospheric pressure of 0.8 to 1.0; water solubility phenolic resin medicine liquid with low molecular weight is immersed and injected; pressurization treatment is carried out so as to reach the atmospheric pressure of 4 to 8; the sample is secondarily vacuumed and treated so as to reach the atmospheric pressure of 0.8 to 1.0; air drying is fully carried out, and simultaneously medicine liquid is recycled; hot pressing and shaping are carried out at a temperature of 140 to 180 DEG C with the pressure of 16.0 to 30.0Mpa. The present invention enables a solid board material to have the advantages of high density, no deformation, no cracking, and good surface performance.
Description
Technical field
The present invention relates to processing method of a kind of timber densification and products thereof, is host with a kind of Water Solvable Low-molecular Weight Phenol-formaldehyde especially, is auxiliary agent method of carrying out surface compressedization of impregnation process artificial forest softwood and products thereof with fire-retardant other material that waits.
Background technology
Timber be human use at most, the most basic raw material.Along with the forest reserves fall sharply and environmental protection more and more is much accounted of and the enforcement of wildwood protected project, China so that the cutting of timber will be fewer and feweri from now on, the substitute is fast growing artificial forest at present.It is exactly that material is soft, density is low, processing technology is poor that these timber exist a common characteristic.Make furniture, ornament materials, construction material with these timber, must change their surface property, by can not destroying its structure under certain condition with its plasticizing densification increasing its density, thereby improve the mechanical strength of handling material.
Usually the method that adopts is:
(1) by the compression of against to the grain direction softwood density is obviously improved.As: heating compression method and boiling compression method technology in the stove, the compressed wood wood shuttle of compressed wood anchor pole that the colliery is used and weaving usefulness.But well-known, timber is elasticity one plastic material, compression, and after external force was removed, very easily elasticity was recovered.
(2) adopt compression large deformation of band direction and typing thereof to handle.As: the top layer part of the Coniferous sawn timber of drying is immersed in the degree of depth predetermined in the water, after infiltrating a certain amount of water, use carry out microwave radiation heating,, thereby softened owing to the top layer part of timber contains moisture.Then it directly is placed on compression, densification on the hot-press arrangement, drying is fixed compression section again, obtains surface compressed timber.The surface compressed material that said method makes, case hardness and abrasion performance degree obviously improve, still, and the size instability, after wet-Re boiling test, compression is 100% recovery almost.
(3), adopt following impregnation process method in order to improve the dimensional stability of surface compressed material:
(1) utilize water miscible phenolic resins to replace immersing water in the timber, through after the densification, because the solidification of resin is fixed compression.Experiment shows: when resin concentration was 15%-20%, surface compressed material boiled in boiling water 2 hours, and gauge does not have change, and compression is fixed fully, and still, it is bad that this kind method is handled big test specimen effect.
(2) utilize low-molecular-weight resin dipping place to bury timber is carried out functionality improvement and fixedly timber compression.As use phenolic resin modified masson pine, this modification material has good anti-corrosion property energy; The bulking factor of modification material and contract with dry rate reduce along with the raising of rate of body weight gain (WPG); The parallel-to-grain compressive strength of modification material, bending strength and hardness are all than material height.
(3) adopt fixedly poplar compressed wood method for processing of low-molecular-weight Melmex (MF).
(4) adopt Water Solvable Low-molecular Weight Phenol-formaldehyde that poplar, cryptomeria are carried out impregnation process, make surface compressed material.The result shows: along with the increase of resin concentration, the rate of body weight gain of timber obviously increases, and when resin concentration surpassed 10%, compression almost completely was fixed, and when resin concentration was 20%, rate of body weight gain was 52%.When resin concentration one timing, the mechanical strength value of surface compressed material increases along with the increase of compression ratio.
Yet there is following problem in above-mentioned the whole bag of tricks:
One. the synthetic resin molecular weight that impregnation process is used is inhomogeneous, and dipping effect is poor.
Two. the wood color after the impregnation process is dark, and big sample dimensions stability is bad.
Three. pf resin of low molecular weight synthesis technique, impregnation technology, heat pressing process are indeterminate, lack the technological parameter of operability.
Four. compressed wood compression ratio in the past is big, is usually used in particular product as wooden shuttle, the bearing etc. of weaving, complex process, product is single, does not form standardization, producing in serial form, and existing market is seldom seen.
Summary of the invention
The purpose of this invention is to provide the surface compressed method of a kind of softwood, it can solve the problem that exists in surface compressedization of softwood, and dipping effect is good, can be permanently fixed timber compression effectively and rationally.
Secondary objective of the present invention provides a kind of novel solid wood sheet material, its density height, indeformable, do not ftracture, surface property is good.
The object of the present invention is achieved like this: the surface compressed method of a kind of softwood may further comprise the steps successively:
1) materialses and put into closed container;
2) vacuumize the 0.8-1.0 atmospheric pressure;
3) the Water Solvable Low-molecular Weight Phenol-formaldehyde soup impregnates;
4) pressurized treatments, the 4-8 atmospheric pressure;
5) examination material secondary vacuum is handled the 0.8-1.0 atmospheric pressure;
6) fully gas is done, simultaneously released liquor;
7) thermocompression forming, temperature: 160 ℃-180 ℃, pressure: 16.0-30.0Mpa;
Wherein, described Water Solvable Low-molecular Weight Phenol-formaldehyde soup is to be host with the Water Solvable Low-molecular Weight Phenol-formaldehyde, and resin concentration is modulated into 10%-15%, transfers pH value with phosphoric acid, adds the fire retardant of ethanol and 3%-5% during preparation, the admixing medical solutions of formation.
Described Water Solvable Low-molecular Weight Phenol-formaldehyde soup is the formaldehyde that adopts phenol and 36.8%, synthesizes with 1: 2.1: 0.1 ratio of mol ratio under the NaOH effect.
The synthesis technique of described Water Solvable Low-molecular Weight Phenol-formaldehyde soup is:
1) dissolve phenol, temperature is 45 ℃-60 ℃, adds NaOH, reacts 10 minutes;
2) add formaldehyde, add the 60-85% of total inventory for the first time, temperature is raised to 65 ℃-80 ℃, reacts 0.5-1.2 hour, adds remaining formaldehyde amount then, and temperature is controlled at 70 ℃-90 ℃, reaction 2-4 hour, cooling discharging then;
Add formaldehyde, add 80% of total inventory for the first time, temperature is raised to 70 ℃-75 ℃, reacts one hour, adds remaining formaldehyde amount then, and temperature is controlled at 75 ℃-80 ℃, reacts three hours, then cooling discharging;
Described Water Solvable Low-molecular Weight Phenol-formaldehyde solidfied material content is 45%-50%, and pH value is 9-10, is preferably 9.2, and viscosity is 13-18 second, is coated with-4 glasss; The molecular weight of described Water Solvable Low-molecular Weight Phenol-formaldehyde more than 98% all between 200-400.
Described Water Solvable Low-molecular Weight Phenol-formaldehyde soup, transferring pH value with phosphoric acid is about 7, in step (2) test specimen that processes is vacuumized 760mmHg, 30min; In step (3), inject soup, soak 10min, the 0.8Mpa that in step (4), pressurizes again, 2 hours; Examination material after will flooding in step (5) carries out secondary vacuum, then step (6) gas do to moisture content be 15%～25%, the thermocompression forming time is 30-40min in step (7).
The novel solid wood sheet material that the above-mentioned method of a kind of usefulness is made comprises middle level, high-density layer and resin bed.
The thickness of high-density layer is the 3-5 millimeter.
Described resin bed is the antiseptic fire-retardation resin bed.
The characteristics that the present invention has are as follows:
One. the synthetic resin that impregnation process is used adopts new prescription and synthesis technique, and the molecular resin amount is evenly distributed, and dipping effect is good, and infiltration is evenly.
Two. adopt new method to carry out soup modulation and impregnation process, it is dark to overcome wood color, and soup is handled uneven weakness, adopts high temperature simultaneously, and big pressure heat pressing process overcomes the shortcoming of surface irregularity.
Three. in liquid formula, add fire retardant, anticorrisive agent, characteristics such as the timber after make handling has fire prevention, anticorrosion, waterproof, do not ftracture, indeformable, dimensionally stable.
Four. because timber pickling phenolic resins, so can directly stick ornament materials such as melamine impregnated paper wainscot material, veneer at wood surface before the hot pressing, carry out hot pressing by heat pressing process then, promptly reached the surface compression purpose and played decoration function again, made common wood become high-quality timber.This processing method has not only been saved precious high-quality timber resources, but also has created bigger economic benefit and social benefit.
Five. the physical and mechanical property index of surface compressed material can artificially be controlled, as: when resin concentration is 10%, when compression ratio was 15%-20%, bending strength increased by 33.5%, and the bending resistance elastic modelling quantity increases by 9.2%, and case hardness increases by 1.5 times.
Describe the concrete steps of the surface compressed method of a kind of softwood that proposes according to the present invention in detail below in conjunction with accompanying drawing.
Description of drawings
Fig. 1 is the surface compressed method process chart of softwood of the present invention.
Fig. 2 is the cutaway view of novel solid wood sheet material of the present invention.
Fig. 3 is the cutaway view of another embodiment of novel solid wood sheet material of the present invention.
The specific embodiment
As shown in Figure 1, the specific embodiment of the invention is as follows:
One. seeds
This research method is applicable to the artificial forest softwood, as quick growing species of trees poplar (Popolus) and China fir (Cunninghamia lanceolata) etc.As required timber is processed into certain shape (plank, batten etc.), moisture content is that gas is done.
Two. resin is synthetic
The Water Solvable Low-molecular Weight Phenol-formaldehyde that the present invention is used is to adopt industrial phenol and industrial formol (36.8%), synthesizes with 1: 2.1: 0.1 ratio of mol ratio under NaOH (industry) effect.Synthesis technique is: 1) dissolve phenol, temperature is 45 ℃-60 ℃, adds NaOH, reacts 10 minutes.2) add formaldehyde, add 80% of total inventory for the first time, temperature is raised to 70 ℃-75 ℃, reacts one hour, adds remaining formaldehyde amount then, and temperature is controlled at 75 ℃-80 ℃, reacts three hours, then cooling discharging.Resin cured matter content is 45%-50%, and pH value is 9.2, and viscosity is 13-15 second (being coated with-4 glasss), and free phenol and content of free aldehyde meet national standard.The molecular weight of water-soluble impregnating phenolic resin all between 200-400, almost do not have macromolecule component, so dipping effect is good, is evenly distributed more than 98%.
Three. impregnation process, heat treated and product processing
At first Water Solvable Low-molecular Weight Phenol-formaldehyde is mixed with the resin liquid of 10%-15% concentration, transferring pH value with phosphoric acid is about 7.Add adequate amount of ethanol and fire retardant during preparation, to increase resin dissolves and anti-flammability, as: the fire retardant that adds 3%-5% when resin concentration is reconciled, make the timber after handling have dimensionally stable, anticorrosion, flame retardant effect, employed anticorrisive agent and fire retardant are prior art, seldom state at this.Secondly the test specimen that processes is vacuumized (760mmHg) 30min.Inject soup, soak 10min, pressurization (0.8MPa) is 2 hours again.Examination material behind the dipping is carried out secondary vacuum pumping, then gas do to moisture content be 15%～25%, thermocompression forming, hot pressing temperature: 160 ℃-180 ℃, time: 30-40min, pressure: 30Mpa is product processing at last, as floor, furniture, balustrade etc.Each operation processing is carried out according to the timber machining process in the product processing part.Because wood surface is soaked with resin, so veneer is processed and heat pressing process can be finished simultaneously, does not need specially treated and specific installation, simplifies production technology, reduces production costs the product surface good decorating effect.
In addition, when hot pressing, can use the stainless steel polishing backing plate to replace common backing plate, the product surface that obtains is bright and clean, bright, can not paint direct use.Product diversification, applied range.
Surface compressed material change color after treatment is little.Become orange colour as poplar from yellow-white.
Novel solid wood sheet material by said method is made as shown in Figure 2, mainly comprises middle level 1, high-density layer 2 and resin bed 3.
In addition, as shown in Figure 3, also can add anticorrosion, fire-retardant soup in resin, resin bed is an antiseptic fire-retardation resin bed 3 ', promptly comprises: middle level 1 ', high-density layer 2 ' and antiseptic fire-retardation resin bed 3 '.
Claims (10)
1, the surface compressed method of a kind of artificial forest softwood is characterized in that: may further comprise the steps successively:
1) materialses and put into closed container;
2) vacuumize the 0.8-1.0 atmospheric pressure;
3) the Water Solvable Low-molecular Weight Phenol-formaldehyde soup impregnates;
4) pressurized treatments, the 4-8 atmospheric pressure;
5) examination material secondary vacuum is handled the 0.8-1.0 atmospheric pressure;
6) fully gas is done, simultaneously released liquor;
7) thermocompression forming, temperature: 160 ℃-180 ℃, pressure: 16.0-30.0Mpa;
Wherein, described Water Solvable Low-molecular Weight Phenol-formaldehyde soup is to be host with the Water Solvable Low-molecular Weight Phenol-formaldehyde, and resin concentration is modulated into 10%-15%, transfers pH value with phosphoric acid, adds the fire retardant of ethanol and 3%-5% during preparation, the admixing medical solutions of formation.
2, the surface compressed method of artificial forest softwood as claimed in claim 1, it is characterized in that: described Water Solvable Low-molecular Weight Phenol-formaldehyde soup, be the formaldehyde that adopts phenol and 36.8%, under the NaOH effect, synthesize with 1: 2.1: 0.1 ratio of mol ratio.
3, the surface compressed method of artificial forest softwood as claimed in claim 2, it is characterized in that: the synthesis technique of described Water Solvable Low-molecular Weight Phenol-formaldehyde soup is:
1) dissolve phenol, temperature is 45 ℃-60 ℃, adds NaOH, reacts 10 minutes;
2) add formaldehyde, add the 60-85% of total inventory for the first time, temperature is raised to 65 ℃-80 ℃, reacts 0.5-1.2 hour, adds remaining formaldehyde amount then, and temperature is controlled at 70 ℃-90 ℃, reaction 2-4 hour, cooling discharging then.
4, the surface compressed method of artificial forest softwood as claimed in claim 2, it is characterized in that: (2) add formaldehyde, add for the first time 80% of total inventory, temperature is raised to 70 ℃-75 ℃, reacted one hour, and added remaining formaldehyde amount then, temperature is controlled at 75 ℃-80 ℃, reacted three hours, then cooling discharging.
5, as claim 3, the surface compressed method of 4 described artificial forest softwoods, it is characterized in that: described Water Solvable Low-molecular Weight Phenol-formaldehyde solidfied material content is 45%-50%, and pH value is 9-10, and viscosity is 13-18 second, is coated with-4 glasss; The molecular weight of described Water Solvable Low-molecular Weight Phenol-formaldehyde more than 98% all between 200-400.
6, the surface compressed method of artificial forest softwood as claimed in claim 5, it is characterized in that: the pH value of described Water Solvable Low-molecular Weight Phenol-formaldehyde is 9.2.
7, the surface compressed method of artificial forest softwood as claimed in claim 1 is characterized in that: it is about 7 that described Water Solvable Low-molecular Weight Phenol-formaldehyde soup is transferred pH value with phosphoric acid, in step (2) test specimen that processes is vacuumized 760mmHg, 30min; In described step (3), inject soup, soak 10min, the 0.8Mpa that in step (4), pressurizes again, 2 hours; Examination material after will flooding in step (5) carries out secondary vacuum, then in step (6) gas do to moisture content be 15%～25%, the thermocompression forming time in step (7) is 30-40min.
8, a kind of novel solid wood sheet material made from the described method of claim 1 is characterized in that: comprise middle level, high-density layer and resin bed.
9, novel solid wood sheet material as claimed in claim 8 is characterized in that: the thickness of high-density layer is the 3-5 millimeter.
10, novel solid wood sheet material as claimed in claim 8 is characterized in that: described resin bed is the antiseptic fire-retardation resin bed.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB00120758XA CN1151912C (en) | 2000-07-11 | 2000-07-11 | Artifical forest soft wood surface compacting metho dand products thereof |
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| CNB00120758XA CN1151912C (en) | 2000-07-11 | 2000-07-11 | Artifical forest soft wood surface compacting metho dand products thereof |
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| CN1151912C true CN1151912C (en) | 2004-06-02 |
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Cited By (2)
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|---|---|---|---|---|
| CN102398289A (en) * | 2011-10-28 | 2012-04-04 | 夏国华 | Wood modifying method |
| CN103433982A (en) * | 2013-07-23 | 2013-12-11 | 南京林业大学 | Processing method of crosswise laminated plate |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102398289A (en) * | 2011-10-28 | 2012-04-04 | 夏国华 | Wood modifying method |
| CN102398289B (en) * | 2011-10-28 | 2014-06-25 | 夏国华 | Wood modifying method |
| CN103433982A (en) * | 2013-07-23 | 2013-12-11 | 南京林业大学 | Processing method of crosswise laminated plate |
| CN103433982B (en) * | 2013-07-23 | 2015-08-05 | 南京林业大学 | Crosswise lamination method for processing sheet material |
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| CN1333113A (en) | 2002-01-30 |
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Assignee: Langfang Huari Furniture Share Co., Ltd. Assignor: Jiang Zehui|Peng Zhenhua|Liu Junliang Contract record no.: 2011130000042 Denomination of invention: Artifical forest soft wood surface compacting metho dand products thereof Granted publication date: 20040602 License type: Exclusive License Open date: 20020130 Record date: 20110506 |
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