CN105269895A - Alkali-treated Eucalyptus grandis x E. urophylla/polyethylene film composite material - Google Patents
Alkali-treated Eucalyptus grandis x E. urophylla/polyethylene film composite material Download PDFInfo
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- CN105269895A CN105269895A CN201410286550.4A CN201410286550A CN105269895A CN 105269895 A CN105269895 A CN 105269895A CN 201410286550 A CN201410286550 A CN 201410286550A CN 105269895 A CN105269895 A CN 105269895A
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Abstract
The invention relates to the technical field of manufacturing of wood-plastic composite materials, particularly a preparation process for an alkali-treated Eucalyptus grandis x E. urophylla/polyethylene film composite material. Eucalyptus grandis x E. urophylla and a high density polyethylene film are used as a main raw material to prepare the alkali-treated Eucalyptus grandis x E. urophylla/polyethylene film composite material, and the alkali liquid concentration, alkali treatment time, hot pressing temperature and time, hot pressing pressure, the use level of the polyethylene film and the like are controlled, thereby achieving the optimum production process effect. Moreover, the performance of the prepared composite material can satisfy the requirements of the GB/T9846-2004 II type plywood standards.
Description
Technical field:
The present invention relates to wood plastic composite manufacturing technology field, particularly a kind of preparation technology of alkali treatment Eucalyptus urophylla-grandis/polyethylene film composite.
Background technology:
The preparation of wood plastic composite is that wood powder and thermosetting resin phenolic resins compound are prepared from the earliest.Afterwards to the seventies and eighties, utilization wood powder and polypropylene were mixed and made into wood plastic composite is applied to ford liner by means of the advantage that it is inexpensive, light weight intensity is high mutually, thus wood plastic composite is utilized fast and develops.Many researchers all attempt using various string as cornstalk, wheat straw, jute even coconut husk equal thermoplastic resin compound, and improve the performance of its composite; Also have researcher to study and improve the wooden compositely proportional moulded, thus attempt to develop superior performance, colory wood-plastic products.Very extensive to the research of wood plastic composite both at home and abroad, research process the early stage mainly concentrated on for wood powder, for the aspect such as research of the application of raw material waste or used plastics and the water absorbing properties of composite and performance raising.
The people such as Esnaashari have studied machinery and the water absorbing properties of sawdust LDPE Composite, and result shows that improving wood powder content can significantly improve stretching and bending property from 40% ~ 60%, strengthens the diffusivity of water and significantly reduces toughness; The people such as Ayrilmis have studied low density polyethylene (LDPE) as the sandwich layer of adhesive for particieboard, show that low density ethylene content is within 10%, along with the rising of content, rupture modulus and elastic modelling quantity increase gradually, but increase content further, MOR and MOE but reduces; The people such as Wang, Y study the interface compatibility of wood powder PP composite material with Method of Stress Relaxation, and research shows that temperature is higher, and stress relaxation must be faster, and during wood powder content 40%, wood powder and polypropylene have optimum interface compatibility; People's high density polyethylene (HDPE)s such as Qi, CS and cotton stalk use hot press molding mode to prepare composite, and result shows that the mechanical performance of composite increases along with the size increase of cotton stalk bundle; The chemical composition of people's hot water extracting such as Pelaez-Samaniego and the unpeeled Ponderosa Pine of amendment, then composite is prepared with the pine of untreated pine and process, polypropylene, polyethylene and a small amount of additive, draw the water that the composite of the pine making processed is more less than untreated absorption 46 ~ 45%, mechanical performance increases.
China is more late for the research of wood plastic composite.The 1980s, Fujian Forestry Inst. and Chinese forest-science academy have carried out Primary Study to wood powder and the compound of waste or used plastics, the mechanical performance of composite and processing technology and equipment etc.Until the nineties, China has just carried out studying widely in a large number to wood plastic composite, comprises the problem such as interface compatibility, processing technology.At present, the domestic research to wood plastic composite focuses mostly at material modification, technological parameter, the aspects such as interface performance.
Yang Wenbins etc. have studied density, the addition of plastics, hot pressing time, hot pressing temperature to the impact of wood and plastic composite performance; Analogy Yun Shui etc. has inquired into the charge ratio of wooden shavings and polypropylene plastics to the impact of the main physico-mechanical performance of sheet material.The change of the timber constituent element form of different tree species, the change of reinforcing agent, the difference of plastics kind and the panel density by orthogonal test research such as Wang Zheng and wood mould than not equal silver on the impact of wood plastic composite physical and mechanical property.The wood plastic composite that Hou Xiuying manufactures with injection molding process, result of study shows that wood-fibred consumption is the principal element affecting composite property; Hu Shiming have studied and adopts expressing technique to prepare the mechanical property of wood plastics composite template and the relation of composite material interface and different surface treatment and glued joint the impact of performance change to compound; Million good, and Li Zhiren analyzes main technologic parameters wood shavings moisture content, hot pressing temperature, and resin added is on the impact of wood-plastic composite particleboard performance.Zhang Kehong with high density polyethylene (HDPE) (HDPE) and wood powder be primary raw material, maleic anhydride grafted polyethylene (MAPE) and silane coupler (KH570) for interface modifier, adopt shaping method to suppress prepared PE base wood-plastic composite material.Have studied interface modifier MAPE and KH570 consumption to the impact of composite materials property.Xie Bo etc. have studied the PP/ Wood Fiber Composites that different molding proces s parameters (injection temperature, dwell pressure) preparation has different microcellular structure, analyze the relation having inquired into molding proces s parameters and composite microporous structure and impact property; Week, woods adopted KH-570 to carry out modification to APP, and make the mechanical property of wood plastic composite, fire resistance and thermal degradation performance significantly improve.
Alkali treatment is the method for a kind of practicality in wood plastic composite, hemicellulose in string and pectin are easily dissolved by alkali, and in the fiber after process, content of cellulose increases relatively, and draw ratio increases, and fiber surface is roughening, power is glued together at the interface be conducive between enhancing and plastics.Adopt the pretreating process of alkali treatment can separate out polyphenol compound and the acetone extraction thing of Eucalyptus, contribute to strengthening wood and mould an adhesion.
Summary of the invention:
The present invention is with Eucalyptus urophylla-grandis and density polyethylene film with high for main raw material(s), and manufacture alkali treatment Eucalyptus urophylla-grandis/polyethylene film composite, the manufacturing step related to is shown in accompanying drawing 1.
The optimum process manufacturing alkali treatment Eucalyptus urophylla-grandis/polyethylene film composite is: concentration of lye 3%, processing time 36h, hot pressing temperature 160 DEG C, polyethylene film consumption 119g/m
2(ratio moulded by wood: 13/1), hot pressing time 50s/mm, hot pressing pressure 0.7MPa.
Beneficial effect of the present invention:
Eucalyptus is as the strategic kind of southern fast-growing woods, there is the plurality of advantages such as standing forest forest form is neat, output is high, material is consistent, although there is many, the defect such as stress is large that scabs, but intensity, rigidity and texture are that other quick-growing plantation timber such as poplar are incomparable, be applicable to furniture woods, floor base material even structure material.Meanwhile, the feature such as huge, the easy recycling of high density polyethylene (HDPE) consumption becomes the cheap and raw material of good performance of wood plastic composite.Therefore, strengthen and be of great practical significance to the utilization of Eucalyptus high added value and the discarded recovery of " white pollution " HDPE, in addition, the produce market prospect of preparation is also quite wide.
This research selects Eucalyptus urophylla-grandis and polyethylene film to be that alkali treatment Eucalyptus urophylla-grandis/polyethylene film composite prepared by raw material, wood-based plate hot pressing-cold-press process is adopted to prepare composite, and using the mode of alkali treatment to carry out pretreatment to veneer, improving the interface cohesion of composite by changing its raw-material molecular structure, polarity and roughness.Through verification experimental verification, the mechanical property of alkali treatment Eucalyptus urophylla-grandis/polyethylene film composite can meet the requirement of GB/T9846-2004II class glued board standard.
Detailed description of the invention:
Accompanying drawing 1 is alkali treatment Eucalyptus urophylla-grandis/polyethylene film composite material manufacturing technology.
(1) test material
Eucalyptus urophylla-grandis (E.grandisxE.urophylla): take from Liuzhou, the age of tree 3 ~ 5 years, moisture content is 7.3 ~ 8.5%, specification 400mm × 400mm × 2mm.
Density polyethylene film with high (HDPE): purchased from Co., Ltd of shield snowflake plastics group of Beijing China, thickness O.06mm, density 0.89g/cm
3, fusing point is 120 DEG C ~ 140 DEG C.
Sodium hydrate particle: Beijing reagent is produced, molecular weight 40.
(2) testing equipment
150T universal test press: BY302 × 2/15 type, nominal pressure 1500KN, heating platen breadth 500 × 500 (mm), Suzhou Xinxieli Machine Manufacturing Co., Ltd.; QD type cold press, Shanghai Artificial Plate Machine Plant.
(3) alkali treatment: put in alkali lye by Eucalyptus urophylla-grandis veneer and soak, optimum configurations is as follows: concentration of lye: 3%; Soak time: 36h.Then rinse to neutral with water, after room temperature places 4h, prevent rapid drying from causing veneer deformation retract, put in drying box and dry 4h.
(4) hot pressing.Polyethylene film is cut into 400mm × 400mm, puts hot pressing in hot press into by after the single plate cross texture assembly processed.In hot pressing, ensure that heat fully transmits by the mode of point two sections of releases.For preventing polyethylene film from shrinking resilience in cooling procedure, should cold pressing immediately after hot pressing, duration 5min.
Claims (2)
1. based on the preparation technology of alkali treatment Eucalyptus urophylla-grandis/polyethylene film composite, it comprises manufactured materials and technological parameter, it is characterized in that: it also comprises the step of manufacture.
2. alkali treatment Eucalyptus urophylla-grandis/polyethylene film composite material preparation process parameter according to claim 1, is characterized in that: concentration of lye, the alkali treatment time, hot pressing temperature, polyethylene film consumption, hot pressing time, hot pressing pressure.
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| CN201410286550.4A CN105269895A (en) | 2014-06-25 | 2014-06-25 | Alkali-treated Eucalyptus grandis x E. urophylla/polyethylene film composite material |
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| CN201410286550.4A CN105269895A (en) | 2014-06-25 | 2014-06-25 | Alkali-treated Eucalyptus grandis x E. urophylla/polyethylene film composite material |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108912709A (en) * | 2018-05-14 | 2018-11-30 | 广西民族大学 | A kind of polyethylene/Eucalyptus powder composite material and preparation method thereof |
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| CN101376252A (en) * | 2008-09-28 | 2009-03-04 | 南京林业大学 | Method for producing plasticizing bamboo or wood single-sided laminated sheet material and application |
| CN101870127A (en) * | 2009-04-27 | 2010-10-27 | 唐善学 | Manufacturing method of thermoplastic resin wood composite board and special equipment |
| CN103144152A (en) * | 2013-03-13 | 2013-06-12 | 中国林业科学研究院木材工业研究所 | Formaldehyde-free plywood and fabrication method thereof |
| CN103240774A (en) * | 2013-04-28 | 2013-08-14 | 福建农林大学 | Environment-friendly flame-retardant degradable composite structure plywood and manufacturing method thereof |
| CN203542759U (en) * | 2013-11-06 | 2014-04-16 | 湖南风河竹木科技有限公司 | Glued formwork made of eucalyptus wood |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101376252A (en) * | 2008-09-28 | 2009-03-04 | 南京林业大学 | Method for producing plasticizing bamboo or wood single-sided laminated sheet material and application |
| CN101870127A (en) * | 2009-04-27 | 2010-10-27 | 唐善学 | Manufacturing method of thermoplastic resin wood composite board and special equipment |
| CN103144152A (en) * | 2013-03-13 | 2013-06-12 | 中国林业科学研究院木材工业研究所 | Formaldehyde-free plywood and fabrication method thereof |
| CN103240774A (en) * | 2013-04-28 | 2013-08-14 | 福建农林大学 | Environment-friendly flame-retardant degradable composite structure plywood and manufacturing method thereof |
| CN203542759U (en) * | 2013-11-06 | 2014-04-16 | 湖南风河竹木科技有限公司 | Glued formwork made of eucalyptus wood |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108912709A (en) * | 2018-05-14 | 2018-11-30 | 广西民族大学 | A kind of polyethylene/Eucalyptus powder composite material and preparation method thereof |
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