CN105563923A - High-density polyethylene directional willow-plastic plate and preparation method thereof - Google Patents

High-density polyethylene directional willow-plastic plate and preparation method thereof Download PDF

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CN105563923A
CN105563923A CN201510939488.9A CN201510939488A CN105563923A CN 105563923 A CN105563923 A CN 105563923A CN 201510939488 A CN201510939488 A CN 201510939488A CN 105563923 A CN105563923 A CN 105563923A
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willow
density polyethylene
hdpe
directed
plate
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段海燕
权备战
任素红
许文静
王绪安
张武斌
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Northwest A&F University
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Northwest A&F University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/02—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising animal or vegetable substances, e.g. cork, bamboo, starch
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B9/045—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/42—Alternating layers, e.g. ABAB(C), AABBAABB(C)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/51—Elastic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/546—Flexural strength; Flexion stiffness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/72—Density
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/02—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/12—Pressure

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Abstract

The invention relates to a high-density polyethylene directional willow-plastic plate and a preparation method thereof. The directional willow-plastic plate is directionally prepared from the following raw materials in percentage by mass: treated salix mongolica branches and high-density polyethylene in a ratio of 50/50-90/10, 2-10% of adhesive and 2-10% of maleic anhydride grafted polyethylene. The invention also relates to the preparation method of the high-density polyethylene directional willow-plastic plate. The high-density polyethylene directional willow-plastic plate has good elastic modulus, static bending strength and inner combination strength, and has mechanical properties far superior to those of a directional particle board. In addition, willow twig resources wide in the Northwest of China are efficiently utilized, a new way is developed for development and utilization of salix mongolica, the environmental pollution problem is also alleviated, and practical meaning in promoting regional economic development and improving regional ecological environment is realized.

Description

The directed willow of a kind of high density polyethylene (HDPE) moulds plate and preparation method thereof
Technical field
The present invention relates to a kind of directed living beings wicker wood and mould plate and preparation method thereof, be specifically related to the directed willow of a kind of high density polyethylene (HDPE) and mould plate and preparation method thereof.
Background technology
Desert shrub is widely grown in the perennial scrub plant of northwest drought, semiarid zone, and according to its biological characteristics, once, these stump branches lignifying, is called desert shrub material to general 3 ~ 5 years plane monitor method.The salix monogolica material fiber of desert shrub material is a kind of natural macromolecular material, have fiber than large, uniform length, the advantage such as the market price is low, proportion is little, biodegradability is good, visible desert shrub material is the excellent materials manufacturing wood-based plate.Up to the present, desert shrub sown area has reached 4.36 ten thousand km 2, with annual 0.06km 2the speed of 3 years stump 1t salix monogolica materials calculates, and annual general stump about has 2,180 ten thousand t, is the fast-growing shrub plant of China's northwest-north-northeast China networks of shelterbelts engineering.Therefore, having a extensive future of shrub board is developed.
At present, the research for salix monogolica mainly concentrates on wicker plaiting article and making sheet field, wherein, main based on particieboard, recombinant material in making sheet field.Such as, the people such as Pan Shifeng, Wang Ximing for raw material, carry out detailed exploration to the production and processing technology of desert shrub recombinant material with " three Norths " regional desert shrub (salix monogolica) generally grown.The people such as peak, Zhang Guilan has probed into composition based on salix monogolica wood shavings and PE film, adds the technique that silane coupler prepares wood-plastic clad plate.The people such as Allan, Gao Zhiyue utilizes composition based on salix monogolica material, adds Lauxite and prepares Scrimber.The people such as Li Qi, peak utilizes composition based on salix monogolica material, prepares Scrimber by adding phenolic resins.But not easily cut off due to desert shrub, content of ashes is high simultaneously, hinders and glues together with adhesive, affect the intensity of particieboard, recombinant material, and particieboard, recombinant material complex manufacturing, production cost is high.But do not relate to long wicker bundle orienting spreading and polyethylene so far and prepare the preparation technology that plate moulded by wood.
Summary of the invention
Technical problem to be solved by this invention is, provides the directed willow of a kind of high density polyethylene (HDPE) of good mechanical performance to mould plate and preparation method thereof.
The technical scheme that the present invention solves the employing of its technical problem is, the directed willow of a kind of high density polyethylene (HDPE) moulds plate, be made up of the raw material orientation of following mass fraction, the salix monogolica bar bundle processed and the proportioning of high density polyethylene (HDPE) are 50/50 ~ 90/10 (preferably 70/30 ~ 90/10, more preferably 80/20), adhesive content be 2 ~ 10% (preferably 4 ~ 8%, more preferably 7%), coupling agent content is 2 ~ 10% (preferably 4 ~ 8%, more preferably 5%).
Further, the described salix monogolica bar bundle processed selects collection to grow well, the desert shrub branch that diameter is moderate, through boiling, discongest, moisture content is the netted wicker of 5% ~ 8% after drying.
Further, described adhesive is Lauxite, phenolic resins or isocyanates; Described coupling agent is maleic anhydride stem grafting polyolefin.
Further, described adhesive is isocyanates; Described maleic anhydride stem grafting polyolefin is maleic anhydride grafted polyethylene.
The technical scheme that the present invention solves the employing of its technical problem is further, the directed willow of a kind of high density polyethylene (HDPE) moulds the preparation method of plate, comprises the following steps:
(1) pretreatment of desert shrub salix monogolica: by design specification cutting salix monogolica branch, then through boiling, discongest, dry, put into sealing bag for subsequent use;
(2) directed willow moulds the preparation of plate: first adopt hand spray adhesive, and the orienting spreading that intersected by two-layer salix monogolica Shu Yusan hdpe layer for subsequent use becomes slab, then adds maleic anhydride grafted polyethylene, through hot pressing, colds pressing.
Further, the directed willow of described high density polyethylene (HDPE) moulds the preparation method of plate, comprises the following steps:
(1) pretreatment of desert shrub salix monogolica: by design specification 35 ~ 45cm × 35 ~ 45cm cutting salix monogolica branch, then boiling 4 ~ 5h, then Temperature fall 7 ~ 8h, then discongest and obtain longitudinal cracking, laterally loose netted wicker, final drying controls moisture content between 5 ~ 8%, puts into sealing bag for subsequent use;
(2) directed willow moulds the preparation of plate: first adopt hand spray adhesive, the orienting spreading that intersected by two-layer salix monogolica Shu Yusan hdpe layer for subsequent use becomes the slab of size 350 ~ 450mm × 350 ~ 450mm, then coupling agent is added, at hot pressing temperature 145 ~ 190 DEG C (preferably 175 DEG C), hot pressing 14 ~ 20min (preferred 18min) under 5 ~ 7MPa pressure, control sheet metal thickness 8 ~ 12mm, then drop to after 2 ~ 4MPa presses 2 ~ 4min and unload, at room temperature finally, cold pressing under 2 ~ 4MPa 15 ~ 20min.
The directed willow of high density polyethylene (HDPE) of the present invention is moulded plate and has good elastic modelling quantity, MOR and internal bond strength, is better than the mechanical property of oriented wood chipboard far away.Moreover the present invention utilizes the Northwest's wicker resource widely efficiently, and the exploitation for salix monogolica open a new way, also alleviate problem of environmental pollution simultaneously, for stimulating the development of the entire local economy, improving region ecological environment and there is realistic meaning.
Experiment proves, the present invention prepares density 0.7g/cm 3, the directed willow plastic clad plate that 10mm is thick, MOR112MPa, MOE11613MPa, IB1.03MPa, exceed 522%, 365%, 264% respectively compared with oriented wood chipboard OSB/I.
Accompanying drawing explanation
Fig. 1 is that the directed willow of high density polyethylene (HDPE) of the present invention moulds plate preparation were established figure.
Fig. 2 is directional composite hot pressing curve of the present invention.
Fig. 3 is that willow of the present invention is moulded the impact of comparison plate property (wherein, (a) moulds the impact of comparison elastic modelling quantity for willow; B () moulds the impact of comparison MOR for willow; C () moulds the impact of comparison internal bond strength for willow).
Fig. 4 is that (wherein, (a) is for glue content is on the impact of elastic modelling quantity on the impact of plate property for glue content of the present invention; B () is for glue content is on the impact of MOR; C () is for glue content is on the impact of internal bond strength).
Fig. 5 is that coupling agent content of the present invention is on the impact of plate property.(wherein, (a) is for coupling agent content is on the impact of elastic modelling quantity; B () is for coupling agent content is on the impact of MOR; C () is for coupling agent content is on the impact of internal bond strength).
Fig. 6 is that (wherein, (a) is for hot pressing temperature is on the impact of elastic modelling quantity on the impact of plate property for hot pressing temperature of the present invention; B () is for hot pressing temperature is on the impact of MOR; C () is for hot pressing temperature is on the impact of internal bond strength).
Fig. 7 is that (wherein, (a) is for hot pressing time is on the impact of elastic modelling quantity on the impact of plate property for hot pressing time of the present invention; B () is for hot pressing time is on the impact of MOR; C () is for hot pressing time is on the impact of internal bond strength).
Fig. 8 is that willow of the present invention moulds plate cross section.
Fig. 9 is that willow of the present invention moulds plate split surface.
Figure 10 is that willow of the present invention moulds plate micro interface.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the invention will be further described.
1, material: this experiment picks up from that to be positioned at Wushen Banner, Ordos of Inner Mongolia domestic, and select collection to grow well at Salix Psammophila, the branch that diameter is moderate, branch is transversal 40cm after cutting 1.2m, through boiling, discongest, moisture content is 5% ~ 8% after drying.Density polyethylene film with high (HDPE), melt flow rate (MFR) (MFI) is 1.1g/min, and density is 0.93g/cm 3, elongation at break is 650%, fusing point 125 ~ 137 DEG C, is purchased from Dongguan City Hou Jiefaye electronic material business department.Maleic anhydride grafted polyethylene (MAPE) colourless granules, density 0.95g/cm 3, melt index 1.5g/10min, percent grafting 1%, fusing point 130 ~ 135 DEG C, is purchased from Dongguan City camphorwood Tou Yimao plastic material business department.Isocyanates gluing agent (MDI), density: 1.04g/cm 3, boiling point: 39.1 DEG C.
2, equipment: DXL1500 press (Xianyang Weidi Electromechanical Science and Technology Co., Ltd.), nominal pressure 1500KN, pad pressing plate breadth 500mm*500mm, the omnipotent mechanics machine of CMT-5504 (company is newly thought carefully by Shenzhen), the cotton stalk of two roller rolls fluffer (Xibei Univ. of Agricultural & Forest Science & Technology's College of Mechanical Engineering development), 101-1AB type electric drying oven with forced convection (Tianjin Stettlen Instrument Ltd.), NF-0.25 type drying test machine (Harbin look down upon the world timber dryer Manufacturing Co., Ltd), WA8 type precision pulling bench saw (Ou Dengduo Machinery Manufacturing Co., Ltd.).
Embodiment 1: the directed willow of high density polyethylene (HDPE) moulds the preparation of plate
Willow moulds plate preparation were established as shown in Figure 1, by design specification (40cm × 40cm) cutting salix monogolica branch, boiling water boiling 5h, Temperature fall 8h, utilize the cotton stalk of two roller to roll fluffer to discongest, obtain longitudinal cracking, laterally loose netted wicker, then send dry kiln to and carry out drying process, moisture control, between 6 ~ 8%, puts into sealing bag for subsequent use.
First adopt hand spray isocyanates, the orienting spreading that two-layer salix monogolica bundle and three-layer polyethylene intersected becomes the slab of size 400mm × 400mm, then maleic anhydride grafted polyethylene is added, utilize heating platen, finger gauge, release cloth to put into hot press hot pressing at 145 ~ 190 DEG C, control sheet metal thickness 10mm, hot pressing curve is as Fig. 2, hot pressing 8 ~ 14min under 6MPa pressure, drop to again after 3MPa presses 3min and unload, at room temperature proceed in cold press the 18min that colds pressing under 3MPa.
Embodiment 2: experimental factor and level
The mode that test adopts single factor test to combine with orthogonal experiment L16 (45), repeat 3 times, according to Literature Consult and trial test result, factor level is set: glue kind (UF, PF, MDI), glue content (2 ~ 10%), willow is moulded than (50/50 ~ 90/10), coupling agent content (2 ~ 10%), hot pressing temperature (145 ~ 190 DEG C), hot pressing time (14 ~ 20min).Measurement index is MOR, MOE, IB and 24hTS.
This experimental design constant heat pressing process: temperature 175 DEG C, pressure 6MP, time 16min.Complete glue kind, willow mould ratio, the experiment of single factor of MAPE, glue content, experiment of single factor test result, in table 1.
Table 1-experiment of single factor scheme and test result
The scope of optimum proportioning is received: willow is moulded than between 90/10 to 70/30 (90/10.85/15.80/20.75/25) by table 1; MAPE coupling agent is at 4 ~ 8% (4%, 5%, 6%, 7%); The content of MDI is at 4 ~ 8% (4%, 5%, 6%, 7%); Optimum glue: isocyanates.
Test adopts L16 (45) orthogonal arrage, repeats 3 times, according to experiment of single factor conclusion, probes into each factor and span: willow is moulded than (90/10.85/15.80/20.75/25), MDI content (4%, 5%, 6%, 7%), MAPE content (4%, 5%, 6%, 7%), and hot pressing temperature (145 DEG C, 160 DEG C, 175 DEG C, 190 DEG C), hot pressing time (14min, 16min, 18min, 20min).Orthogonal experiment results, in table 2.
Table 2-orthogonal experiment scheme and test result
As shown in Table 2, willow moulds the elastic modelling quantity (MOE) of plate, MOR (MOR), internal bond strength (IB) are far beyond oriented wood chipboard OSB/1 (elastic modelling quantity 2500MPa, MOR 18MPa, internal bond strength is 0.28MPa) standard, internal bond strength value (IB) standard value O.8MPa near fluctuation.
Embodiment 3: Mechanics Performance Testing
1, method of testing: pressed density is 0.70g/cm 3, thickness 10mm the directed willow of living beings wicker-high density polyethylene (HDPE) mould plate, with reference to wood-based plate and face artificial board physicochemical property test method, test the density of this material, moisture content, IB, 24hTS, MOR, MOE, every block plate every performance is no less than 4 pieces of test specimens.
2, willow moulds the impact of comparison directional composite mechanical property: see Fig. 3.As shown in Figure 3, under the condition of fixing remaining variables, HDPE content constantly increases, salix monogolica bundle fiber each other gap and HDPE contact rate strengthen, dispersion rate increases, the HDPE content penetrating into salix monogolica bundle fiber gap each other increases thereupon, thus causes adhesion each other to increase thereupon, MOR and IB performance also slowly raises thereupon; But along with the increasing of HDPE applied amount, because temperature constantly raises, time increases, under the condition of density restriction, HDPE flows to sheet material edge in hot pressing, cause spilling, which results in when HDPE consumption is increased to some, IB, MOR that directed willow moulds sheet material are just on a declining curve.The impact that willow moulds comparison MOR with MOE is substantially the same, but due to the MOE of high density polyethylene (HDPE) lower than the MOE of salix monogolica bundle, therefore, along with high density polyethylene (HDPE) applied amount continues to increase, the MOE that directed willow moulds plate has just engendered downslide tendency.
3, glue content is on the impact of directional composite mechanical property: see Fig. 4.As shown in Figure 4, along with the increase of MDI amount, there is the rear downward trend that first rises in the MOE that directed willow moulds plate, but the scope of variation is little; And the trend that increases has appearred in MOR, IB always, but be also change in a very little scope, almost do not have anything to affect.Tracing it to its cause is mould in plate in the directed willow of high density polyethylene (HDPE), and MDI plays the effect of part adhesive, and namely when MDI consumption increases, salix monogolica bundle and isocyanate glue have sufficient contact area, and gummed is good.Also show in orthogonal experiment data scope of design, along with the applied amount of isocyanate glue increases, internal bond strength (IB) strengthens, and salix monogolica bundle fully contacts with sizing material, polyethylene etc., and gummed is good simultaneously.
4, coupling agent content is on the impact of directional composite mechanical property: see Fig. 5.As shown in Figure 5, along with MAPE amount improves constantly, glide after remarkable lifting has appearred in MOE, MOR and IB that directed willow moulds plate.This is because MAPE molecule has carboxyl, and when the applied amount along with MAPE reaches certain limit, low than salix monogolica MOE of the MOE of HDPE, after overruning, the MOE that willow moulds plate is just on a declining curve.Meanwhile, carboxyl generation chemical reaction during MDI solidification and in MAPE, changes into acid amides and has discharged a large amount of CO 2, so not only like water off a duck's backly waste MDI, and the CO discharged 2unfavorable to mechanical property.Therefore, the amount of MAPE, when certain limit, significantly can promote willow and mould the characteristics such as the mechanics of sheet material.Reason is MAPE is that a kind of strand head end possesses polar group, and tail end has non-polar group.And one end chemical group of MAPE polarity can be compatible with the salix monogolica Shu Jinhang of polarity, and its nonpolar one end can be interconnected with HDPE, serve as the compatibility that a chemical Link role regulates salix monogolica bundle and HDPE, enhance the infiltration of HDPE, short salix monogolica bundle and the more firm connection of HDPE, thus substantially increase the performance that directed willow moulds plate.
5, hot pressing temperature is on the impact of directional composite mechanical property, sees Fig. 6.As shown in Figure 6, increase hot pressing temperature within the specific limits, the mobility of plastics increases, and facilitates the reaction of salix monogolica bundle and vinyon, thus MOR, MOE, IB are increased.But temperature is too high, HDPE evenly to surrounding flowing, but to sheet edge flowing under the long stapled guiding of salix monogolica, can not cause vinyon skewness in sheet material, thus impels MOE, MOR and IB to reduce under the effect of salix monogolica long-fiber bundle on the one hand; When hot pressing temperature constantly raises on the other hand, directed willow is moulded plate face and easily forms pre-hardening thickness, and MDI also degrades, and degraded has appearred in salix monogolica bundle surface, causes sheet material MOR, MOE to reduce.
6, hot pressing time is on the impact of directional composite mechanical property: see Fig. 7.As shown in Figure 7, increase when the time in hot pressing, the heat of hot press is moulded sheet material outer layers towards inner layers from willow and is conducted, thus it is outer almost close with central core temperature to cause directed willow to mould sheet material, HDPE in sheet material internal flow dispersion thoroughly, more extend and the salix monogolica bundle correlated response time each other, thus cause willow to mould MOR, MOE, IB trend along with the prolongation appearance increase of time of sheet material.But constantly increase along with the time, the mobility of HDPE strengthens, and cause directed Liu Suban center to claim with sheet material periphery HDPE skewness, downward trend appears in the relevant mechanical property causing directed willow to mould plate.When the time is set to 18min, can there is an obvious peak value in MOR, IB that directed willow moulds plate.HDPE content and flow dispersion situation playing a role clearly to elastic modelling quantity, along with time lengthening, internal layer HDPE will reduce, obvious dissymmetry will appear in polyethylene dispersion, and then can cause in the process of experiment, MOE prolongation in time and declining.
7, optimum process analysis: carry out range analysis, variance analysis, significance test to orthogonal experimental data, it the results are shown in Table 3, table 4.
Table 3-result of the test calculates
Table 4-variance analysis and significance test
Note: F0.1 (2,18)=2.62.F0.05 (2,18)=3.55, F0.01 (2,18)=6.01, * represent remarkable, and * * represents extremely remarkable
Table 5-affects the more excellent process conditions of each performance indications
To sum up, Optimal technique process of the present invention is that willow is moulded than 80/20, glue content 7%, coupling agent content 5%, hot pressing temperature 175 DEG C, hot pressing time 18min, carries out the checking type test of correlated performance, obtains directed willow and mould the mechanical properties value of plate as table 6.As shown in Table 6, compared with the standard of oriented wood chipboard OSB/I, improve 522%, 365%, 264% respectively.
Demonstration test result under table 6-Optimal technique process
Density g/cm3 MOE(MPa) MOR(MPa) IB(MPa) 24hTS(％) 8 -->
0.72 11613 112 1.05 5.21
Embodiment 4: microscope micro-analysis
Get willow and mould plate test specimen cross section, and test specimen split surface carries out microscope microscopic observation.Directed willow moulds sheet material cross section as Fig. 8, as shown in Figure 8, in hot pressing, due to the effect of hot pressing time and temperature, high density polyethylene (HDPE) and MAPE can meltings fully, but because salix monogolica bundle is discongested degree varies and caused, there is the salix monogolica bundle that section diameter is larger, in hot pressing, high density polyethylene (HDPE) cannot penetrate into wherein, and the salix monogolica bundle position that gap is large each other, also exists a large amount of high density polyethylene (HDPE)s, which results in glue-line too thick, affect plate property.Directed willow moulds plate subdivision graph as Fig. 9, and as shown in Figure 9, high density polyethylene (HDPE) may penetrate into the inside of sheet material, and MAPE has also penetrated into certain distance.Directed willow moulds plate micro interface as Figure 10, as shown in Figure 10, structure between high density polyethylene (HDPE) and salix monogolica bundle, illustrate and there is engaging structure between salix monogolica bundle and high density polyethylene (HDPE), MAPE, but also can see in the structure of sheet material, between part salix monogolica interfascicular gap, do not have high density polyethylene (HDPE), to mould plate cross-sectional view result consistent with directed willow.

Claims (9)

1. the directed willow of high density polyethylene (HDPE) moulds plate, it is characterized in that, be made up of the raw material orientation of following mass fraction, the salix monogolica bar bundle processed and the proportioning of high density polyethylene (HDPE) are 50/50 ~ 90/10, and adhesive content is 2 ~ 10%, coupling agent content is 2 ~ 10%.
2. the directed willow of high density polyethylene (HDPE) according to claim 1 moulds plate, it is characterized in that, be made up of the raw material orientation of following mass fraction, the salix monogolica bar bundle processed and the proportioning of thermoplastic resin are 70/30 ~ 90/10, and adhesive content is 4 ~ 8%, coupling agent content is 4 ~ 8%.
3. the directed willow of high density polyethylene (HDPE) according to claim 2 moulds plate, it is characterized in that, be made up of the raw material orientation of following mass fraction, the salix monogolica bar bundle processed and the proportioning of thermoplastic resin are 80/20, and adhesive content is 7%, coupling agent content is 5%.
4. mould plate according to the directed willow of the high density polyethylene (HDPE) one of claims 1 to 3 Suo Shu, it is characterized in that, the described salix monogolica bar bundle processed selects collection to grow well, the desert shrub branch that diameter is moderate, through boiling, discongest, moisture content is the netted wicker of 5% ~ 8% after drying.
5. mould plate according to the directed willow of the high density polyethylene (HDPE) one of claims 1 to 3 Suo Shu, it is characterized in that, described adhesive is Lauxite, phenolic resins or isocyanates; Described coupling agent is maleic anhydride stem grafting polyolefin.
6. the directed willow of high density polyethylene (HDPE) according to claim 5 moulds plate, and it is characterized in that, described adhesive is isocyanates; Described maleic anhydride stem grafting polyolefin is maleic anhydride grafted polyethylene.
7. the directed willow of the high density polyethylene (HDPE) as described in one of claim 1 ~ 6 moulds a preparation method for plate, it is characterized in that, comprises the following steps:
(1) pretreatment of desert shrub salix monogolica: by design specification cutting salix monogolica branch, then through boiling, discongest, dry, put into sealing bag for subsequent use;
(2) directed willow moulds the preparation of plate: first adopt hand spray adhesive, and the orienting spreading that intersected by two-layer salix monogolica Shu Yusan hdpe layer for subsequent use becomes slab, then adds maleic anhydride grafted polyethylene, through hot pressing, colds pressing.
8. the directed willow of high density polyethylene (HDPE) according to claim 7 moulds the preparation method of plate, it is characterized in that, comprises the following steps:
(1) pretreatment of desert shrub salix monogolica: by design specification 35 ~ 45cm × 35 ~ 45cm cutting salix monogolica branch, then boiling 4 ~ 5h, then Temperature fall 7 ~ 8h, then discongest and obtain longitudinal cracking, laterally loose netted wicker, final drying controls moisture content between 5 ~ 8%, puts into sealing bag for subsequent use;
(2) directed willow moulds the preparation of plate: first adopt hand spray adhesive, the orienting spreading that intersected by two-layer salix monogolica Shu Yusan hdpe layer for subsequent use becomes the slab of size 350 ~ 450mm × 350 ~ 450mm, then coupling agent is added, hot pressing temperature 145 ~ 190 DEG C, hot pressing 14 ~ 20min under 5 ~ 7MPa pressure, controls sheet metal thickness 8 ~ 12mm, then drop to after 2 ~ 4MPa presses 2 ~ 4min and unload, it is last that at room temperature cold pressing under 2 ~ 4MPa 15 ~ 20min.
9. the directed willow of high density polyethylene (HDPE) according to claim 8 moulds the preparation method of plate, it is characterized in that, in step (2), and described hot pressing temperature 175 DEG C, hot pressing time 18min.
CN201510939488.9A 2015-12-15 2015-12-15 High-density polyethylene directional willow-plastic plate and preparation method thereof Pending CN105563923A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112015004201B4 (en) 2014-09-15 2018-03-22 Maolin Li A large-format wood material from desert pastures and manufacturing processes for it
CN108972824A (en) * 2018-08-23 2018-12-11 安徽美林凯迪木业有限公司 A kind of high-strength environmentally friendly door

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Publication number Priority date Publication date Assignee Title
CN1119979A (en) * 1995-05-19 1996-04-10 王二壮 Water-resistant plywood and its production method
WO2009135442A1 (en) * 2008-05-09 2009-11-12 大连交通大学 Magnesium alloy honeycomb board and preparation method thereof
CN201446605U (en) * 2009-04-20 2010-05-05 西北农林科技大学 Straw compound recombination material
CN103659946A (en) * 2013-11-30 2014-03-26 北京林业大学 Directional wood-plastic composite plate and manufacturing method thereof
CN104802226A (en) * 2014-01-27 2015-07-29 上海杰事杰新材料(集团)股份有限公司 Wood-plastic composite board and manufacturing method and application thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1119979A (en) * 1995-05-19 1996-04-10 王二壮 Water-resistant plywood and its production method
WO2009135442A1 (en) * 2008-05-09 2009-11-12 大连交通大学 Magnesium alloy honeycomb board and preparation method thereof
CN201446605U (en) * 2009-04-20 2010-05-05 西北农林科技大学 Straw compound recombination material
CN103659946A (en) * 2013-11-30 2014-03-26 北京林业大学 Directional wood-plastic composite plate and manufacturing method thereof
CN104802226A (en) * 2014-01-27 2015-07-29 上海杰事杰新材料(集团)股份有限公司 Wood-plastic composite board and manufacturing method and application thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112015004201B4 (en) 2014-09-15 2018-03-22 Maolin Li A large-format wood material from desert pastures and manufacturing processes for it
CN108972824A (en) * 2018-08-23 2018-12-11 安徽美林凯迪木业有限公司 A kind of high-strength environmentally friendly door

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