CN111546724B

CN111546724B - Container wood-plastic bottom plate and preparation method thereof

Info

Publication number: CN111546724B
Application number: CN202010445939.4A
Authority: CN
Inventors: 唐道远; 吴光荣; 黄东辉
Original assignee: Anhui Sentai Wpc Group Share Co ltd
Current assignee: Anhui Sentai Wpc Group Share Co ltd
Priority date: 2020-05-25
Filing date: 2020-05-25
Publication date: 2023-03-03
Anticipated expiration: 2040-05-25
Also published as: CN111546724A

Abstract

The invention belongs to the technical field of wood-plastic plates, and particularly discloses a container wood-plastic bottom plate and a preparation method thereof, wherein the container wood-plastic bottom plate comprises a core layer and a skin layer wrapping the core layer, and a reinforcing layer is arranged between the core layer and the skin layer; the core layer and the skin layer are made of wood-plastic plates, and the core layer is doped with short fibers; the reinforcing layer is of a net structure and is made of glass fiber or metal; the core layer, the skin layer and the reinforcing layer are integrally formed by adopting a co-extrusion process. According to the invention, the arrangement of the short fiber combined reinforcing layer is added in the core layer wood-plastic material, so that the strength of the wood-plastic plate is obviously improved and the strength requirement of the bottom plate of the container is met; the protective core layer and the reinforcing layer are wrapped by the skin layer, so that the service life of the bottom plate is prolonged; the reinforcing layer is designed into a net structure, and the firmness of the combination between layers is greatly improved by combining a co-extrusion process.

Description

Container wood-plastic bottom plate and preparation method thereof

Technical Field

The invention relates to the technical field of wood-plastic plates, in particular to a wood-plastic bottom plate of a container and a preparation method thereof.

Background

The container bottom plate is a floor which is arranged at the bottom of the container and plays a role in bearing and fixing goods. The wooden board becomes the main material of the container bottom plate because of its specific gravity is little, easy installation is fixed, and current container bottom plate is mostly bamboo, wooden plywood, but because forest resource transition felling, timber resource also more and more is few, and the use of wooden bottom plate receives very big restriction. The wood-plastic composite material is a green environment-friendly material which is developed in recent years and takes waste wood fiber powder and polymer as main raw materials, has the use and processing characteristics of wood and plastic, is commonly used as building templates, furniture, floors and the like, and can certainly greatly relieve the problem of wood resource shortage faced by container bottom plates if the wood-plastic composite material can be applied to the container bottom plates.

The conventional wood-plastic plate can not be directly used as a container bottom plate because the strength of the conventional wood-plastic plate can not meet the requirement, in the prior art, the strength of the wood-plastic plate is usually improved by adding reinforcing fibers into a wood-plastic material, for example, the bending strength, the modulus and the impact strength of the wood-plastic composite material are improved by adding glass fibers into a hybrid wood-plastic composite material disclosed in the Chinese patent publication No. CN105924720A, but the wood-plastic plate can still not meet the requirement of the strength of the container bottom plate in the mode.

Disclosure of Invention

The invention aims to provide a wood-plastic bottom plate of a container, which is light in weight, high in strength, convenient and fast to install and can completely replace non-environment-friendly bamboo and wood plywood with formaldehyde.

In order to achieve the purpose, the invention adopts the following specific technical scheme:

the utility model provides a container wood-plastic bottom plate which characterized in that: comprising a core layer and a skin layer surrounding said core layer, an

A reinforcing layer is arranged between the core layer and the skin layer; the core layer and the skin layer are wood-plastic plates, and the core layer is doped with short fibers; the reinforcing layer is of a net structure and is made of glass fiber or metal; the core layer, the skin layer and the reinforcing layer are integrally formed by adopting a co-extrusion process.

Preferably, the core layer comprises the following raw materials in parts by weight: 100-120 parts of wood powder, 5.5-7.5 parts of compatilizer, 40-55 parts of thermoplastic resin, 25-35 parts of triple superphosphate, 15-22 parts of short fiber, 3-8 parts of lubricant and 0.3-0.6 part of antioxidant; the skin layer comprises the following raw materials in parts by weight: 55-70 parts of wood powder, 7.5-10 parts of compatilizer, 55-60 parts of thermoplastic resin, 50-60 parts of triple superphosphate, 3-8 parts of lubricant, 0.3-0.6 part of antioxidant, 0.3-0.6 part of light stabilizer and 0-15 parts of toner.

Preferably, the wood powder is 70-100 meshes of poplar powder, the compatilizer is maleic anhydride grafted ABS, the thermoplastic resin is ABS first-grade recycled resin particles, the coarse whiting is 1600-2000 meshes of coarse whiting, the short fibers are glass fibers, carbon fibers or rock fibers with the diameter of 7-20 microns, the length of 6-9 mm and the modulus of more than or equal to 100GPa, and the lubricant is Struktol Tpw604.

Preferably, through holes are distributed in the middle of the core layer at intervals, and the formed through holes play a role in reducing weight, so that the raw material and transportation cost is effectively reduced.

Preferably, the cortex lower surface is equipped with a plurality of locating holes, and the setting of locating hole is in order to fix a position the screw when the bottom plate installation, improves the installation accuracy, has avoided the installation to cause the destruction to panel.

Preferably, the tenon and the mortise are respectively arranged at the same horizontal position of the two sides of the leather layer. The installation is accomplished through the cooperation of tenon and tongue-and-groove between the bottom plate, and is simple convenient.

Preferably, the pore size of the mesh structure is 1-5mm. The aperture is too small, so that sufficient contact area cannot be provided for the core layer and the skin layer during co-extrusion, and the combination of the core layer and the skin layer is influenced; too large aperture and insufficient strength.

Preferably, the net-shaped structure is provided with supporting parts at intervals for improving the flatness; the supporting part is arranged on the surface of the combination of the reticular structure and the core layer.

Preferably, the thickness of the skin layer is 0.6-2mm, and the thickness of the core layer is 15-25mm.

The invention also aims to provide a preparation method of the wood-plastic bottom plate of the container, which comprises the following steps:

s1, releasing the network: pulling a fiber net or a metal net into a mold in advance, respectively winding the two ends of the net on a net rack, and setting the temperature of the mold at 160-180 ℃;

s2, core layer extrusion: mixing the raw materials of the core layer, adding the mixture into an extruder, and extruding the plasticized material into a die after high-temperature plasticization; the core layer is in a molten state, and is contacted with the net after entering the die and drives the net to move forward together, so that the net is attached to the surface of the core layer, and the net rack is automatically unreeled in the process;

s3, extruding a skin layer: mixing the raw materials of the skin layer, adding the mixture into another extruder, and extruding the material after high-temperature plasticization into a die; the molten skin layer is attached to the surface of the net, and the core layer and the net are wrapped;

s4, demolding: the core layer, the net and the skin layer are integrally formed in a mould and then extruded out by a mould head, and then are cooled and shaped.

The invention has the following beneficial effects:

1. the container wood-plastic bottom plate is of a structure that a skin layer wraps a core layer, and a reinforcing layer is arranged between the skin layer and the core layer, the overall strength of the bottom plate is initially improved by adding short fibers in a core layer wood-plastic material, and on the basis, the reinforcing layer made of glass fibers or metal is arranged on the periphery of the core layer to further improve the strength of the bottom plate; the core layer and the reinforcing layer are wrapped by the high-hardness skin layer, so that the external environment can be isolated, the cooperative reinforcing structure is well protected, and the service life of the bottom plate is effectively prolonged; and the three-layer structure is integrally formed through a co-extrusion process, so that the reinforcing layer is firmly combined with the core layer and the skin layer, and compared with the existing plywood, the plywood is more environment-friendly, and the structural stability is also obviously improved. The mechanical property of the wood-plastic bottom plate prepared by the invention can reach that the static bending strength is more than or equal to 90MPa, the bending elastic modulus is more than or equal to 11GPa, and the requirements of the existing plywood GB/T19536-2015 for the container bottom plate are met.

2. The reinforcing layer is designed into a net structure, so that the combination level among the core layer, the skin layer and the reinforcing layer is further improved. Because the enhancement layer is network structure to be located between sandwich layer and the cortex, when crowded altogether, the cortex of molten state flows in the both sides of net with the sandwich layer, and realizes contact butt fusion between them through the mesh, makes sandwich layer, cortex and enhancement layer can two liang take place to combine, improves the firmness of combining between the layer greatly. More optimally, the aperture of the net structure is controlled to be 1-5mm, so that the requirement on the self strength is met while enough contact area is provided for the core layer and the skin layer during co-extrusion.

3. Because the cortex is very thin, the corresponding space of mould is very little when extruding for melting form cortex is difficult to flow in it and is dispersed, and setting up of network structure's enhancement layer has produced more resistance to the flow of melting form cortex, is difficult to cooperate the flow of sandwich layer when making the cortex extrude, leads to the shaping difficulty. According to the invention, firstly, the lubricating agent is added into the raw materials to improve the fluidity of the core layer and the skin layer, and for the skin layer which is more difficult to flow, the fluidity of the thermoplastic resin is further improved by improving the proportion of the thermoplastic resin, so that the skin layer can overcome the small mold space and the resistance of the reticular reinforcing layer, the flow dispersion capability is improved, the skin layer can be better matched with the core layer for co-extrusion molding, and the co-extrusion efficiency and the molding effect are improved.

4. Because the reinforcing layer is a light and thin net-shaped structure (the thickness is about 1 mm) and has certain tension, when the co-extrusion process advances along with the molten core layer, the phenomena of deformation and bending easily occur, so that the concave-convex of the net-shaped structure embedded in the core layer is uneven, the difficulty of flow diffusion of the skin layer is increased, the combination level of the three layers is seriously influenced, and the appearance and the mechanical property of a finished product are further influenced; the supporting part is arranged on the surface of the reticular reinforcing layer, which is combined with the core layer and protrudes out of the surface of the reinforcing layer, so that the combination level of the reinforcing layer and the core layer is improved when the supporting part is embedded into the core layer, and more importantly, the supporting part plays a role in fixing and limiting, so that the reticular structure can be continuously and smoothly attached to the core layer, the wrapping effect of the skin layer is improved, and the quality of a finished product is ensured.

5. The width of the container bottom plate can reach 1m, and the existing container bottom plate can reach about 0.5m at most, so the installation cost is low, and the bottom plate of the invention is provided with a large number of through holes for weight reduction while ensuring the strength, so the raw material and the carrying cost are effectively reduced, and the invention has good economic value.

Drawings

FIG. 1: the invention discloses a structural schematic diagram of a wood-plastic bottom plate of a container.

FIG. 2 is a schematic diagram: the enlarged schematic at a in fig. 1.

FIG. 3: the enlarged schematic view at B in fig. 1.

FIG. 4 is a schematic view of: the invention relates to a front view of a device for preparing a wood-plastic bottom plate of a container.

FIG. 5: the invention discloses a top view of a device for manufacturing a wood-plastic bottom plate of a container.

FIG. 6: example 3 a schematic view of the structure of the reinforcing layer.

In the figure: 1-a core layer, 2-a skin layer, 3-a reinforcing layer, 31-a supporting part, 4-through holes, 5 positioning holes, 6-tenons, 7-mortises, 8-a first extruder, 9-a second extruder, 10-an upper fiber net rack, 11-a lower fiber net rack, 12-a mould, 121-a mould head and 13-a shaping table.

Detailed Description

The invention is further described below with reference to the following figures and specific examples.

Example 1

A wood-plastic bottom plate for a container is shown in figures 1-2 and comprises a core layer 1 and a skin layer 2 wrapping the core layer 1, wherein a reinforcing layer 3 is arranged between the core layer 1 and the skin layer 2, the thickness of the skin layer 2 is 0.6-2mm, and the thickness of the core layer 1 is 15-25mm; the core layer 1 and the skin layer 2 are wood-plastic plates, and the core layer 1 is doped with short fibers; the reinforcing layer 3 is a net structure with the aperture of 1-5mm and is made of glass fiber or metal; through holes 4 are distributed in the middle of the core layer 1 at intervals; a plurality of positioning holes 5 (shown in figure 3) are formed in the lower surface of the leather layer 2, and tenons 6 and mortises 7 are formed in the two sides of the leather layer 2 at the same horizontal position respectively; the core layer 1, the skin layer 2 and the reinforcing layer 3 are integrally formed by adopting a co-extrusion process.

The core layer 1 comprises the following raw materials in parts by weight: 100-120 parts of wood powder, 5.5-7.5 parts of compatilizer, 40-55 parts of thermoplastic resin, 25-35 parts of triple superphosphate, 15-22 parts of short fiber, 3-8 parts of lubricant and 0.3-0.6 part of antioxidant; the skin layer 2 comprises the following raw materials in parts by weight: 55-70 parts of wood powder, 7.5-10 parts of compatilizer, 55-60 parts of thermoplastic resin, 50-60 parts of triple superphosphate, 3-8 parts of lubricant, 0.3-0.6 part of antioxidant, 0.3-0.6 part of light stabilizer and 0-15 parts of toner. The wood powder is 70-100 meshes of poplar powder, the compatilizer is maleic anhydride grafted ABS, the thermoplastic resin is ABS first-grade recycled resin particles, the coarse whiting is 1600-2000 meshes of coarse whiting, the short fibers are glass fibers, carbon fibers or rock fibers with the diameter of 7-20 microns, the length of 6-9 mm and the modulus of more than or equal to 100GPa, and the lubricant is Struktol Tpw604.

More specifically, in this embodiment, the skin layer 2 is 1mm thick, and the core layer 1 is 20mm thick; the reinforcing layer 3 is a glass fiber net with the aperture of 3 mm; the core layer 1 comprises the following raw materials in parts by weight: 110 parts of 80-mesh poplar powder, 7 parts of maleic anhydride grafted ABS, 50 parts of ABS first-level recycled resin particles, 30 parts of 1800-mesh heavy calcium carbonate, 19.7 parts of basalt fibers with the diameter of 7-20 mu m, the chopped length of 6-9 mm and the modulus of more than or equal to 100GPa, 604 parts of Struktol Tpw604, 0.2 part of antioxidant 1010, and 168.2 parts of antioxidant; the raw materials of the skin layer 2 comprise the following components in parts by weight: 63 parts of 80-mesh poplar powder, 7.88 parts of maleic anhydride graft, 55 parts of ABS primary recovered resin particles, 55 parts of 1800-mesh heavy calcium carbonate, 5 parts of Struktol Tpw, 0.2 part of antioxidant 1010, 0.2 part of antioxidant 168.2, 0.2 part of UV2628, 0.2 part of UV944, 9.4 parts of titanium dioxide, 0.02 part of carbon black and 0.03 part of iron oxide red.

Example 2

A production device of a container wood-plastic bottom plate is shown in figures 4-5 and comprises a first extruder 8, a second extruder 9, an upper fiber net rack 10, a lower fiber net rack 11, a mold 12 and a shaping table 13; the first extruder 8 is used for extruding the core layer, the second extruder 9 is used for extruding the skin layer, and the extrusion ports of the first extruder 8 and the second extruder 9 are butted with the die 12; the upper fiber net rack 10 and the lower fiber net rack 11 are arranged at the upper side and the lower side of the die 12; the die 12 comprises a die head 121, and the shaping table 13 is arranged at the outlet end of the die head 121.

The method for preparing the wood-plastic bottom plate of the container in the embodiment 1 by using the production equipment comprises the following steps:

s1, releasing the network: the glass fiber net is pulled into a mould 12 in advance, two ends of the net extend out of the mould 12, one end of the net is wound on an upper fiber net rack 10, and the other end of the net is wound on a lower fiber net rack 11; setting the temperature in the mold 12 at 160-180 ℃;

s2, core layer extrusion: mixing the raw materials of the core layer, adding the mixture into a first extruder 8, plasticizing the materials at high temperature, and extruding the plasticized materials into a die 12; the core layer is in a molten state, and is contacted with the net and drives the net to move forward after entering the die 12, so that the net is attached to the surface of the core layer, and the upper fiber net rack 10 and the lower fiber net rack 11 are synchronously and automatically unreeled along with the synchronous forward movement of the core layer and the net;

s3, extruding a skin layer: mixing the raw materials of the skin layer, adding the mixture into a second extruder 9, and extruding the mixture into a die 12 after the material is plasticized at high temperature; the molten skin layer is attached to the surface of the net, and the core layer and the net are wrapped;

s4, demolding: the core layer, the web, and the skin layer are integrally formed in the mold 12, extruded through the die head 121, and then cooled and set in the setting table 13.

Example 3

The embodiment provides an optimized reinforcing layer 3, as shown in fig. 6, the reinforcing layer is a glass fiber web, a plurality of supporting portions 31 are arranged on the surface of the glass fiber web at intervals, the supporting portions 31 can be arranged on the surface of a net structure combined with a core layer, the supporting portions 31 are long strips and are formed integrally with the glass fiber web to be convex, the arrangement direction of the supporting portions 31 in the embodiment is perpendicular to the running direction of the glass fiber web in a mold, and in the process that the core layer 1 drives the glass fiber web to move forward, the supporting portions 31 are embedded into the molten core layer 1, so that the combination level of the glass fiber web and the core layer is improved, more importantly, a fixing and limiting effect is achieved, the net portion of the glass fiber web is not easy to deform or bend, the whole glass fiber web is smoothly attached to the core layer 1, and the smooth proceeding of subsequent extrusion and wrapping of skin layers is facilitated. Comparative example 1

A wood-plastic bottom plate for a container comprises a core layer 1 and a skin layer 2 wrapping the core layer 1, and is different from the wood-plastic bottom plate in embodiment 1 only in that a reinforcing layer 3 is not arranged.

The mechanical performance tests of example 1 and the comparative examples were carried out according to the Standard "plywood for Container flooring of GB-T19536-2015", and the comparison results were as follows:

according to the invention, the core layer and the skin layer made of the reinforced fiber and wood-plastic mixed material are arranged, and the reinforcing layer is arranged, so that the strength of the wood-plastic plate is obviously improved, and the strength requirement of the bottom plate of the container is met; if only the reinforcing fibers are added into the wood-plastic material without the reinforcing layers, the strength of the conventional wood-plastic plate can be improved by about 60 percent, and the strength requirement of the container bottom plate still cannot be met.

The present embodiments are to be considered as illustrative and not restrictive, and all changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein.

Claims

1. The utility model provides a container wood-plastic bottom plate which characterized in that: the composite material comprises a core layer (1) and a skin layer (2) wrapping the core layer (1), wherein a reinforcing layer (3) is arranged between the core layer (1) and the skin layer (2); the core layer (1) and the skin layer (2) are wood-plastic plates, and the core layer (1) is doped with short fibers; the reinforcing layer (3) is of a net structure and is made of glass fiber or metal; the core layer (1), the skin layer (2) and the reinforcing layer (3) are integrally formed by adopting a co-extrusion process;

the core layer (1) comprises the following raw materials in parts by weight: 100-120 parts of wood powder, 5.5-7.5 parts of compatilizer, 40-55 parts of thermoplastic resin, 25-35 parts of triple superphosphate, 15-22 parts of short fibers, 3-8 parts of lubricant and 0.3-0.6 part of antioxidant;

the skin layer (2) comprises the following raw materials in parts by weight: 55-70 parts of wood powder, 7.5-10 parts of compatilizer, 55-60 parts of thermoplastic resin, 50-60 parts of triple superphosphate, 3-8 parts of lubricant, 0.3-0.6 part of antioxidant, 0.3-0.6 part of light stabilizer and 0-15 parts of toner;

the aperture of the net structure is 1-5mm;

the reticular structure is provided with supporting parts (31) at intervals for improving the flatness; the supporting part (31) is arranged on the surface of the reticular structure combined with the core layer; the supporting part (31) is arranged perpendicular to the feeding direction of the reinforcing layer;

and the wood-plastic bottom plate of the container is prepared by the method comprising the following steps:

s2, core layer extrusion: mixing the raw materials of the core layer, adding the mixture into an extruder, plasticizing the materials at high temperature, and extruding the plasticized materials into a die; the core layer is in a molten state, and is contacted with the net after entering the die and drives the net to move forward together, so that the net is attached to the surface of the core layer, and the net rack is automatically unreeled in the process;

s4, demolding: the core layer, the net and the skin layer are integrally formed in a mould and then extruded out by a mould head, and then cooled and shaped.

2. The wood-plastic floor for containers as claimed in claim 1, wherein: the poplar wood powder is 70-100 meshes of poplar powder, the compatilizer is maleic anhydride grafted ABS, the thermoplastic resin is ABS first-grade recycled resin particles, the coarse whiting is 1600-2000 meshes of coarse whiting, the short fibers are glass fibers, carbon fibers or rock fibers with the diameters of 7-20 mu m, the lengths of 6-9 mm and the modulus of more than or equal to 100GPa, and the lubricant is Struktol Tpw604.

3. The wood-plastic floor for containers as claimed in claim 1, wherein: through holes (4) are distributed in the middle of the core layer (1) at intervals.

4. The wood-plastic floor for containers as claimed in claim 1, wherein: the lower surface of the skin layer (2) is provided with a plurality of positioning holes (5).

5. The wood-plastic floor for containers as claimed in claim 1, wherein: the same horizontal position of both sides of cortex (2) has seted up tenon (6) and tongue-and-groove (7) respectively.

6. The wood-plastic floor for containers according to claim 1, wherein: the thickness of the skin layer (2) is 0.6-2mm, and the thickness of the core layer (1) is 15-25mm.