CN105710938A - Grafted polyethylene non-formaldehyde plywood and preparing method thereof - Google Patents
Grafted polyethylene non-formaldehyde plywood and preparing method thereof Download PDFInfo
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- CN105710938A CN105710938A CN201610140051.3A CN201610140051A CN105710938A CN 105710938 A CN105710938 A CN 105710938A CN 201610140051 A CN201610140051 A CN 201610140051A CN 105710938 A CN105710938 A CN 105710938A
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- grafted polyethylene
- maleic anhydride
- veneer
- plywood
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
- C08F255/02—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00 on to polymers of olefins having two or three carbon atoms
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Veneer Processing And Manufacture Of Plywood (AREA)
Abstract
The invention discloses grafted polyethylene non-formaldehyde plywood and a preparing method of the plywood. The preparing method comprises following steps that log is rotatably cut into veneers with a certain thickness through a rotary cutting machine; all veneers are overlaid in the direction that adjacent layers are in cross-structure textures, prefabricated molded maleic anhydride grafted polyethylene plastic films are arranged between the adjacent veneers, and a plate blank is formed; the plate blank is subjected to heat pressing treatment; and the plate blank subjected to heat pressing treatment is subjected to cooling, aging and edge cutting treatment, and the plywood is prepared. According to the plywood, the veneers are bonded through the maleic anhydride grafted polyethylene plastic films, releasing of free formaldehyde does not exist, the physical and mechanical properties are excellent, and the water resisting property is good. Meanwhile, the component of a bonding material of the plywood is single, no additive needs to be added, and the production process of adhesives is greatly simplified.
Description
Technical field
The present invention relates to the plywood in wood producing industry of artificial boards, be specifically related to a kind of grafted polyethylene aldehyde-free by wood and preparation method thereof.
Background technology
The adhesive that presently commercially available plywood product great majority use is containing formaldehyde components " three-aldehyde glue ", and it is cheap, adhesive property is excellent, makes large usage quantity, accounts for the 80%～90% of whole industry of artificial boards glue consumption.But plywood product is producing and is discharging a large amount of free formaldehyde in use procedure, it is easy to causes environmental pollution, causes great damage to producers and consumers is healthy.
For this, Chinese invention patent CN103144152A discloses " a kind of formaldehyde-free plywood and preparation method thereof ", is mixed by a certain percentage by different waste plastics, adds relevant filler and auxiliary agent, prepare plastic alloy glued membrane, and prepare the plywood of formaldehydeless release as adhesive.The plywood water-tolerant produced by waste plastic alloy, but the physical and mechanical property between nonpolar plastic alloy and polarity plank is on the low side, and meanwhile, adhesive composition is more, complex manufacturing, considerably increases the operation of manufacture.
Therefore, existing plywood also exists the release of free formaldehyde, mechanical property is relatively low, adhesive composition is more, the problem of complex manufacturing.
Summary of the invention
The technical problem to be solved is that existing plywood also exists the release of free formaldehyde, mechanical property is relatively low, adhesive composition is more, the problem of complex manufacturing.
In order to solve above-mentioned technical problem, the preparation method that the technical solution adopted in the present invention is to provide a kind of grafted polyethylene aldehyde-free by wood, comprise the following steps:
Log adopt peeler be peeled into the veneer that thickness is certain；
It is that chi structure grain direction overlaps by each veneer by adjacent layer, prefabricated profiled maleic anhydride grafted polyethylene plastic sheeting is set between adjacent veneer, form slab；
Slab is carried out hot-pressing processing；
Slab after hot-pressing processing is cooled down, display, cutting edge processes, prepared by plywood.
In such scheme, the preparation method of described maleic anhydride grafted polyethylene thin film comprises the steps:
80～120 parts by weight polyethylene, 0.05～0.2 parts by weight initiator and 0.5～3 parts by weight maleic anhydride are added in double screw extruder；
Melt extrude acquisition PE-g-MAH；
Inflation film manufacturing machine or cast film machine is utilized to make the maleic anhydride grafted polyethylene thin film of predetermined thickness.
In such scheme, described polyethylene is the mixture that Low Density Polyethylene, high density polyethylene (HDPE) or above two mix with arbitrary proportion, and described initiator is cumyl peroxide, benzoyl peroxide.
In such scheme, the thickness of described maleic anhydride grafted polyethylene thin film is 0.05～0.5 millimeter.
In such scheme, when adding maleic anhydride grafted polyethylene thin film between adjacent veneer, the resin added of each glue-line is 100～250 grams/m.
In such scheme, in hot pressing, hot pressing temperature is 130～180 degrees Celsius, and hot pressing pressure is 0.5～2.0 MPa, and the thickness that hot pressing time is plywood often increases by 1 millimeter, and hot pressing time increases by 0.4～3.0 minute.
In such scheme, the thickness of described veneer is 0.1～10 millimeter, and the moisture content of described veneer is 5～12%.
The present invention also provides for a kind of grafted polyethylene aldehyde-free by wood, including at least two-layer spaced veneer from top to bottom, by the maleic anhydride grafted polyethylene diaphragm seal bonding without formaldehyde between veneer described in the two-layer of arbitrary neighborhood.
In such scheme, the thickness of described maleic anhydride grafted polyethylene thin film is 0.05～0.5 millimeter, polyethylene, initiator and maleic anhydride are made.
The present invention, is bonded by maleic anhydride grafted polyethylene thin film between veneer, is absent from the release of free formaldehyde, and physical and mechanical property is excellent, water-tolerant.Meanwhile, the bonding material composition of this plywood is single, it is not necessary to add any additive, enormously simplify the production technology of adhesive.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Detailed description of the invention
Below in conjunction with Figure of description, the present invention is described in detail.
As it is shown in figure 1, the preparation method that the invention provides a kind of grafted polyethylene aldehyde-free by wood, comprise the following steps:
First preparing in advance maleic anhydride grafted polyethylene thin film 2, for when being made in binding agent when preparing plywood, the preparation method of maleic anhydride grafted polyethylene thin film 2 comprises the steps:
80～120 parts by weight polyethylene, 0.05～0.2 parts by weight initiator and 0.5～3 parts by weight maleic anhydride are added in double screw extruder.Polyethylene is the mixture that Low Density Polyethylene, high density polyethylene (HDPE) or above two mix with arbitrary proportion, and initiator is cumyl peroxide, benzoyl peroxide.
Melt extrude acquisition PE-g-MAH (maleic anhydride grafted polyethylene), maleic groups in PE-g-MAH can react with the hydroxyl in wood single-plate, produce strong chemical interactions, interface bond strength is higher, and PE-g-MAH is less owing to introducing polarity maleic groups, has good resistance to water.
Utilizing inflation film manufacturing machine or cast film machine to make the maleic anhydride grafted polyethylene thin film 2 of predetermined thickness, thickness is preferably 0.05～0.5 millimeter.Being used without aldehyde glue as plywood by maleic anhydride grafted polyethylene thin film 2, this adhesive composition is single, it is not necessary to adds any filler and auxiliary agent, enormously simplify production technology.
The making of plywood can be carried out afterwards, log adopt peeler be peeled into the certain veneer of thickness 1, preferably, log is pressed and other pin broad-leaved woods selected from poplar, Eucalyptus, willow, the thickness of veneer 1 is 0.1～10 millimeter, the moisture content of veneer is 5～12%, such log long service life, durable.
It is that chi structure grain direction overlaps by each veneer 1 by adjacent layer, prefabricated profiled maleic anhydride grafted polyethylene plastic sheeting 2 is set between adjacent veneer 1, form slab.When adding maleic anhydride grafted polyethylene thin film 2 between adjacent veneer 1, the resin added of each glue-line is 100～250 grams/m, both can guarantee that bonding is firmly, turn avoid glue consumption and too much produce waste.
Slab is carried out hot-pressing processing, and in hot pressing, hot pressing temperature is 130～180 degrees Celsius, and hot pressing pressure is 0.5～2.0 MPa, and the thickness that hot pressing time is plywood often increases by 1 millimeter, and hot pressing time increases by 0.4～3.0 minute.Hot pressing enhances the bonding fastness between maleic anhydride grafted polyethylene thin film 2 with veneer 1, solid and reliable.
Slab after hot-pressing processing is cooled down, display, cutting edge processes, and namely plywood has been prepared.
Below in conjunction with specific embodiment, the present invention is described in detail.
Embodiment 1:
100 parts by weight Low Density Polyethylenes, 0.1 parts by weight cumyl peroxide and 0.8 parts by weight maleic anhydride are added in double screw extruder, melt extrude acquisition PE-g-MAH, then, utilize inflation film manufacturing machine or cast film machine to make maleic anhydride grafted polyethylene thin film 2 that thickness is 0.15 millimeter, using it as the aldehyde-free by wood provided by the invention adhesive between adjacent veneer 1.
With poplar for raw material, it is peeled into the veneer 1 that thickness is 1.5 millimeters, veneer 1 moisture content 8%, the maleic anhydride grafted polyethylene thin film 2 prepared is formed slab with board using poplar board according to one layer of maleic anhydride grafted polyethylene thin film 2 of one layer of veneer, adjacent veneer texture orthogonal manner, then being positioned in hot press by slab, be hot pressed into plate, hot pressing temperature is 140～150 degrees Celsius, hot pressing pressure is 0.5～1.0 MPa, and hot pressing time is 0.4～3.0 minute.Finally, cooled, display, cutting edge process, obtain aldehyde-free by wood.The plywood bonding strength prepared is tested by II class plywood method of testing in GB GB/T9846-2004, record bonding strength index (63 degrees Celsius of decocting in water 3 hours far above national Specification, bonding strength more than 0.7 MPa), the bonding strength of poplar plywood reaches 1.44 MPas.
Embodiment 2
100 parts by weight Low Density Polyethylenes, 0.15 parts by weight cumyl peroxide and 1.2 parts by weight maleic anhydrides are added in double screw extruder, melt extrude acquisition PE-g-MAH, then, utilize inflation film manufacturing machine or cast film machine to make thin film that thickness is 0.15 millimeter, using it as the aldehyde-free by wood provided by the invention adhesive between adjacent veneer.
With poplar for raw material, it is peeled into the veneer that thickness is 1.5 millimeters, Veneer moisture 8%, the maleic anhydride grafted polyethylene thin film 2 prepared is formed slab with board using poplar board by one layer of maleic anhydride grafted polyethylene thin film 2 of one layer of veneer, adjacent veneer texture orthogonal manner, then being positioned in hot press by slab, be hot pressed into plate, hot pressing temperature is 140～150 degrees Celsius, hot pressing pressure is 0.5～1.0 MPa, and hot pressing time is 0.4～3.0 minute.Finally, cooled, display, cutting edge process, obtain three layers aldehyde-free by wood.The plywood bonding strength prepared is tested by II class plywood method of testing in GB GB/T9846-2004, record bonding strength index (63 degrees Celsius of decocting in water 3 hours far above national Specification, bonding strength more than 0.7 MPa), the bonding strength of poplar plywood reaches 1.65 MPas.
Embodiment 3
100 parts by weight high density polyethylene (HDPE)s, 0.1 parts by weight cumyl peroxide and 0.8 parts by weight maleic anhydride are added in double screw extruder, melt extrude acquisition PE-g-MAH, then, utilize inflation film manufacturing machine or cast film machine to make maleic anhydride grafted polyethylene thin film 2 that thickness is 0.15 millimeter, using it as the aldehyde-free by wood provided by the invention adhesive between adjacent veneer.
With poplar for raw material, it is peeled into the veneer that thickness is 1.5 millimeters, Veneer moisture 8%, the maleic anhydride grafted polyethylene thin film 2 prepared is formed slab with board using poplar board by one layer of maleic anhydride grafted polyethylene thin film 2 of one layer of veneer, adjacent veneer 1 texture orthogonal manner, then being positioned in hot press by slab, be hot pressed into plate, hot pressing temperature is 160～170 degrees Celsius, hot pressing pressure is 0.5～1.0 MPa, and hot pressing time is 0.4～3.0 minute.Finally, cooled, display, cutting edge process, obtain aldehyde-free by wood.The plywood bonding strength prepared is tested by II class plywood method of testing in GB GB/T9846-2004, record bonding strength index (63 degrees Celsius of decocting in water 3 hours far above national Specification, bonding strength more than 0.7 MPa), the bonding strength of poplar plywood reaches 2.18 MPas.
Embodiment 4
100 parts by weight high density polyethylene (HDPE)s, 0.15 parts by weight cumyl peroxide and 1.2 parts by weight maleic anhydrides are added in double screw extruder, melt extrude acquisition PE-g-MAH, then, utilize inflation film manufacturing machine or cast film machine to make maleic anhydride grafted polyethylene thin film 2 that thickness is 0.15 millimeter, using it as the aldehyde-free by wood provided by the invention adhesive between adjacent veneer.
With poplar for raw material, it is peeled into the veneer that thickness is 1.5 millimeters, the maleic anhydride grafted polyethylene thin film 2 prepared is formed slab with board using poplar board by one layer of maleic anhydride grafted polyethylene thin film 2 of one layer of veneer, adjacent veneer texture orthogonal manner, then slab is positioned in hot press, it is hot pressed into plate, hot pressing temperature is 160～170 degrees Celsius, and hot pressing pressure is 0.5～1.0 MPa, and hot pressing time is 0.4～3.0 minute.Finally, cooled, display, cutting edge process, obtain aldehyde-free by wood.The plywood bonding strength prepared is tested by II class plywood method of testing in GB GB/T9846-2004, record bonding strength index (63 degrees Celsius of decocting in water 3 hours far above national Specification, bonding strength more than 0.7 MPa), the bonding strength of poplar plywood reaches 2.51 MPas.
Present invention also offers a kind of grafted polyethylene aldehyde-free by wood, including at least two-layer spaced veneer 1 from top to bottom, by the maleic anhydride grafted polyethylene diaphragm seal bonding without formaldehyde between the two-layer veneer 1 of arbitrary neighborhood.The thickness of maleic anhydride grafted polyethylene thin film 2 is 0.05～0.5 millimeter, polyethylene, initiator and maleic anhydride are made.
The present invention, is bonded by maleic anhydride grafted polyethylene thin film between veneer, is absent from the release of free formaldehyde, and physical and mechanical property is excellent, water-tolerant.Meanwhile, the bonding material composition of this plywood is single, it is not necessary to add any additive, enormously simplify the production technology of adhesive.
The present invention is not limited to above-mentioned preferred forms, and anyone should learn the structure change made under the enlightenment of the present invention, and every have same or like technical scheme with the present invention, each falls within protection scope of the present invention.
Claims (9)
1. the preparation method of a grafted polyethylene aldehyde-free by wood, it is characterised in that comprise the following steps:
Log adopt peeler be peeled into the veneer that thickness is certain；
It is that chi structure grain direction overlaps by each veneer by adjacent layer, prefabricated profiled maleic anhydride grafted polyethylene plastic sheeting is set between adjacent veneer, form slab；
Slab is carried out hot-pressing processing；
Slab after hot-pressing processing is cooled down, display, cutting edge processes, prepared by plywood.
2. the preparation method of a kind of grafted polyethylene aldehyde-free by wood as claimed in claim 1, it is characterised in that the preparation method of described maleic anhydride grafted polyethylene thin film comprises the steps:
80～120 parts by weight polyethylene, 0.05～0.2 parts by weight initiator and 0.5～3 parts by weight maleic anhydride are added in double screw extruder；
Melt extrude acquisition PE-g-MAH；
Inflation film manufacturing machine or cast film machine is utilized to make the maleic anhydride grafted polyethylene thin film of predetermined thickness.
3. the preparation method of a kind of grafted polyethylene aldehyde-free by wood as claimed in claim 2, described polyethylene is the mixture that Low Density Polyethylene, high density polyethylene (HDPE) or above two mix with arbitrary proportion, and described initiator is cumyl peroxide, benzoyl peroxide.
4. the preparation method of a kind of grafted polyethylene aldehyde-free by wood as claimed in claim 2, it is characterised in that the thickness of described maleic anhydride grafted polyethylene thin film is 0.05～0.5 millimeter.
5. the preparation method of a kind of grafted polyethylene aldehyde-free by wood as claimed in claim 1, it is characterised in that when adding maleic anhydride grafted polyethylene thin film between adjacent veneer, the resin added of each glue-line is 100～250 grams/m.
6. the preparation method of a kind of grafted polyethylene aldehyde-free by wood as claimed in claim 1, it is characterized in that, in hot pressing, hot pressing temperature is 130～180 degrees Celsius, hot pressing pressure is 0.5～2.0 MPa, the thickness that hot pressing time is plywood often increases by 1 millimeter, and hot pressing time increases by 0.4～3.0 minute.
7. the preparation method of a kind of grafted polyethylene aldehyde-free by wood as claimed in claim 1, it is characterised in that the thickness of described veneer is 0.1～10 millimeter, and the moisture content of described veneer is 5～12%.
8. a grafted polyethylene aldehyde-free by wood, including at least two-layer spaced veneer from top to bottom, it is characterised in that by the maleic anhydride grafted polyethylene diaphragm seal bonding without formaldehyde between veneer described in the two-layer of arbitrary neighborhood.
9. a kind of grafted polyethylene aldehyde-free by wood as claimed in claim 8, it is characterised in that the thickness of described maleic anhydride grafted polyethylene thin film is 0.05～0.5 millimeter, polyethylene, initiator and maleic anhydride are made.
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| CN201610140051.3A CN105710938A (en) | 2016-03-11 | 2016-03-11 | Grafted polyethylene non-formaldehyde plywood and preparing method thereof |
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| CN201610140051.3A CN105710938A (en) | 2016-03-11 | 2016-03-11 | Grafted polyethylene non-formaldehyde plywood and preparing method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106182212A (en) * | 2016-07-20 | 2016-12-07 | 福州翰扬环保科技有限公司 | Glued membrane without aldehyde is combined veneer and applies its plywood automatically to arrange board production technology |
| CN106928874A (en) * | 2017-03-21 | 2017-07-07 | 潘学扬 | A kind of glued board thermosetting glued membrane and glued board |
| CN109337611A (en) * | 2018-10-17 | 2019-02-15 | 河源市普立隆新材料科技有限公司 | Aldehyde-free by wood adhering resin and preparation method |
| CN110405869A (en) * | 2019-08-22 | 2019-11-05 | 上海市建筑科学研究院 | The orthogonal laminated wood plate and preparation method thereof that nanocomposite is reinforced |
| CN112428376A (en) * | 2020-12-04 | 2021-03-02 | 德华兔宝宝装饰新材股份有限公司 | Formaldehyde-free flame-retardant plywood and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106182212A (en) * | 2016-07-20 | 2016-12-07 | 福州翰扬环保科技有限公司 | Glued membrane without aldehyde is combined veneer and applies its plywood automatically to arrange board production technology |
| CN106928874A (en) * | 2017-03-21 | 2017-07-07 | 潘学扬 | A kind of glued board thermosetting glued membrane and glued board |
| CN109337611A (en) * | 2018-10-17 | 2019-02-15 | 河源市普立隆新材料科技有限公司 | Aldehyde-free by wood adhering resin and preparation method |
| CN110405869A (en) * | 2019-08-22 | 2019-11-05 | 上海市建筑科学研究院 | The orthogonal laminated wood plate and preparation method thereof that nanocomposite is reinforced |
| CN112428376A (en) * | 2020-12-04 | 2021-03-02 | 德华兔宝宝装饰新材股份有限公司 | Formaldehyde-free flame-retardant plywood and production method thereof |
| CN112428376B (en) * | 2020-12-04 | 2021-11-05 | 德华兔宝宝装饰新材股份有限公司 | Formaldehyde-free flame-retardant plywood and production method thereof |
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