CN111688143A

CN111688143A - Manufacturing method of novel wood-plastic plate and foaming mold thereof

Info

Publication number: CN111688143A
Application number: CN202010546743.4A
Authority: CN
Inventors: 徐建统
Original assignee: Ningbo Jingyi Leisure Products Co ltd
Current assignee: Ningbo Jingyi Leisure Products Co ltd
Priority date: 2020-06-16
Filing date: 2020-06-16
Publication date: 2020-09-22

Abstract

The invention discloses a manufacturing method of a novel wood-plastic plate, which comprises the following manufacturing procedures: s1, mixing the main material and the auxiliary material through a stirrer, and then granulating the mixture in a granulator to generate granules; the main materials are modified copolymerized polyphenyl alkene and fine wood powder; the auxiliary materials are a compatilizer, a lubricant, an ultraviolet-resistant antioxidant and toner; the invention also discloses a foaming mould of the wood-plastic plate, which is used for foaming the novel wood-plastic plate; the invention has the beneficial effects that: 1. the modified copolymerized polyphenyl alkene is adopted, the product formula is perfected, and the use requirements of high temperature and low temperature are met; 2. a foaming mold with a special structure is adopted to fully foam and fully plasticize the material; 3. through surface treatment such as thermal transfer printing, the attractiveness of the plate is improved, and less colors, patterned paths and the like are met; 4. the board manufactured by the manufacturing method has small thermal deformation coefficient and good stability, the product has texture and is not heavy, and the board is more stable and more heavy when being assembled on the desktop of the finished outdoor furniture.

Description

Manufacturing method of novel wood-plastic plate and foaming mold thereof

Technical Field

The invention relates to a manufacturing method of a novel wood-plastic plate.

Background

The wood-plastic composite board is a high-tech green environment-friendly novel decorative material which is mainly prepared by uniformly mixing wood (wood cellulose and plant cellulose) as a base material, a thermoplastic high polymer material (plastic), a processing aid and the like, and then heating and extruding the mixture by using a die device, has the performance and characteristics of both wood and plastic, and is a novel composite material capable of replacing the wood and the plastic.

In recent years, with the enhancement of the environmental protection consciousness of people, wood-plastic composite materials which are wide in raw material source, environment-friendly, renewable and recyclable are more and more valued by people. The wood-plastic composite material is prepared by compounding a polymer (mostly thermoplastic polyolefin) and plant fiber (mostly wood powder), has the excellent performances of both plastics and wood, has strong plasticity, can very simply realize personalized modeling, has high environmental protection, is pollution-free and pollution-free, does not contain substances such as benzene, formaldehyde and the like, can be recycled and the like.

At present, outdoor leisure furniture, particularly European and American markets, are in great demand, but plastic-wood plates commonly used for the outdoor leisure furniture are PS plates, the PS plates are mainly formed by EPS or single-screw foaming extrusion mixing of GPPS and HIPS, and the density of the plates is 0.6-0.75. In product use, customers are generally reflecting the appearance: the anti-corrosion and anti-corrosion.

The PS board manufacturing process is firstly carried out by Germany in the 80 s and is gradually introduced from 2000 years in China to replace the log board used on outdoor furniture. The PS main material has low thermal melting temperature, large coefficient of deformation caused by thermal expansion and cold contraction, insufficient surface hardness after foaming, reduced screw pulling force of the foamed board, and many defects, and can not meet the increasing consumption quality requirements of human beings.

Under the continuous innovation of the existing equipment, process, material and other technologies, a novel wood-plastic composite board for outdoor furniture and a complete preparation process are developed by adopting a brand-new material formula, process improvement, equipment modification, mold manufacturing innovation and technology integration through various efforts.

Disclosure of Invention

Aiming at the current situation of the prior art, the invention provides a manufacturing method of a novel wood-plastic board.

The specific scheme of the invention is as follows: a method for manufacturing a novel wood-plastic plate comprises the following manufacturing procedures: s1, mixing the main material and the auxiliary material through a stirrer, transferring the mixture into a metering type feeder through an automatic feeding machine, and then feeding the mixture into a granulator for granulation to generate granulated materials; the main materials are modified copolymerized polyphenyl alkene and fine wood powder, wherein the modified copolymerized polyphenyl alkene accounts for 20% -45%, and the fine wood powder accounts for 50% -80%; the auxiliary materials comprise 1-3% of compatilizer, 1-3% of lubricant, 0.5-2% of ultraviolet-resistant antioxidant and 1-3% of toner;

s2, adding a foaming agent into the granulated material according to the proportion, and uniformly stirring by using a stirrer to generate raw materials of the extruder; 0.5% -2% of foaming agent;

s3, feeding the raw materials of the extruder into a barrel of the extruder, and extruding the raw materials of the extruder through the extruder to generate an extruded material;

s4, injecting the extrusion material into a foaming mold for micro-foaming molding, injecting the extrusion material into a cavity of the micro-foaming mold through a nozzle, stirring and extruding the extrusion material in the moving process through a core rod in the cavity, so that the extrusion material is slightly vibrated, and the extrusion material is condensed after being dispersed, so that the plate is molded;

s5, enabling the half-formed plate subjected to primary micro-foaming in the micro-foaming mold to enter a forming mold, wherein the forming mold is divided into two sections, the front section is a vacuumizing micro-foaming mold with the size ratio of 1:1.05, the board is more stable due to vacuumizing micro-foaming, the rear section is a shaping mold, and water circulation cooling is adopted;

and S6, shaping, heat transfer printing and embossing the raw material subjected to secondary micro-foaming molding, and finally cutting and blanking.

Further, the melt index of the modified copolymerized polyphenylene is less than 0.5g/min, and the mesh number of the fine wood powder is 25-135 meshes.

Further, in the steps S1 and S2, the stirrer is a high-speed mixer, the granulator is a parallel double-screw machine, and the granulation temperature is controlled to be 150-280 ℃.

Further, in step S3, the extruder is a conical twin-screw extruder, the temperature of the four sections of the extruder body is 150-250 ℃, the temperature of the six sections of the extruder body is 130-180 ℃, the extruder is provided with a cooling water tank and a cutting machine, and a tractor is synchronously arranged.

The mould for foaming the wood-plastic plate is used for foaming the novel wood-plastic plate, the foaming mould comprises a mould head, a bracket mould, an opening mould and a water jacket which are sequentially arranged, and a core rod is arranged in a cavity of the foaming mould.

Furthermore, the starting end of the core rod is positioned in a cavity of the die head, the tail end of the core rod is positioned in a cavity of the die head, and the starting end of the core rod is a flow guide section with a triangular section.

Further, a bracket is arranged in a cavity of the bracket die, and the core rod is fixed in the cavity of the foaming die by the bracket.

Furthermore, a cavity in the die head is a horizontal round table, and the inner diameter of the cavity on the end face is larger than that of the cavity in the die head.

Furthermore, a protruding insert is arranged on the end face of the water jacket, and the cavity extends to the end face of the insert.

The invention has the beneficial effects that: 1The modified copolymerized polyphenyl alkene is adopted, the product formula is perfected, and the high and low temperature use requirements are met; 2. a foaming mold with a special structure is adopted to fully foam and fully plasticize the material; 3. through surface treatment such as thermal transfer printing, the attractiveness of the plate is improved, and less colors, patterned paths and the like are met; 4. the density of the board prepared by the preparation method is 0.9-1.15 g/cm³The product has the advantages of small thermal deformation coefficient, good stability, texture and no weight bias, and is more stable and more heavy when being assembled on the tabletop of the finished outdoor furniture.

Drawings

FIG. 1 is an external structural view of a foaming mold;

FIG. 2 is a cross-sectional view of a foaming mold;

the attached drawings are marked with: 1. the device comprises a die head, 2, a support die, 3, a neck die, 4, a water jacket, 5, a core rod, 21, a support, 41, an insert, 51 and a flow guide section.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a method for manufacturing a wood-plastic plate, which comprises the following manufacturing procedures:

s1, mixing the main material and the auxiliary material through a stirrer, transferring the mixture into a metering type feeder through an automatic feeding machine, and then feeding the mixture into a granulator for granulation to generate granulated materials; the main materials are modified copolymerized polyphenyl alkene and fine wood powder, wherein the modified copolymerized polyphenyl alkene accounts for 20% -45%, and the fine wood powder accounts for 50% -80%; the auxiliary materials comprise 1-3% of compatilizer, 1-3% of lubricant, 0.5-2% of ultraviolet-resistant antioxidant and 1-3% of toner;

s2, adding a foaming agent into the granulated material according to the proportion, and uniformly stirring by using a stirrer to generate raw materials of the extruder; 0.5% -2% of foaming agent, and stirring for about 15 minutes by common mixing and stirring;

s4, injecting the extrusion material into a foaming mold for micro-foaming molding, injecting the extrusion material into a cavity of the micro-foaming mold through a nozzle, stirring and extruding the extrusion material in the moving process through a core rod in the cavity, so that the extrusion material is slightly vibrated, and the extrusion material is condensed after being dispersed, so that the plate is molded; the extruded materials are continuously stirred and vibrated in the moving process in the cavity, so that the plasticizing effect is enhanced;

and S6, shaping, heat transfer printing and embossing the raw material subjected to secondary micro-foaming molding, and finally cutting and blanking. The thermal transfer printing process is realized on a thermoprinting machine, the embossing process is completed on an embossing wheel, the surface of the plate is embossed with grains, and meanwhile, the flatness of the plate is improved;

according to the production amount of the plate, the thermal transfer printing process and the embossing process can be selected to be processed on line or not;

the on-line surface processing comprises the following steps: extruder → micro-foaming molding → secondary micro-foaming molding → shaping mold shaping → thermoprinting machine (special for heat transfer film) → embossing → cooling → cutting → blanking; after blanking, turning to a finish machining process with plate specification requirements;

the off-line surface processing comprises the following steps: extruding machine → micro-foaming molding → secondary micro-foaming molding → shaping mold molding → cooling → cutting → blanking; after blanking, turning to a finish machining process with plate specification requirements;

the temperature of a roller of the embossing machine is set to be 70-130 ℃, the grain depth is extruded by the transmission of a wrench rotating screw, and the flatness of the plate is improved by extrusion.

As a further description of the above technical solution: the melt index of the modified copolymerized polyphenylene is less than 0.5g/min, and the mesh number of the fine wood powder is 25-135 meshes.

As a further description of the above technical solution: in the steps S1 and S2, the stirrer is a high-speed mixer, the granulator is a parallel double-screw machine, and the granulation temperature is controlled to be 150-280 ℃.

As a further description of the above technical solution: in the step S3, the extruder is a conical double-screw extruder, the temperature of the four sections of the extruder body is 150-250 ℃, the temperature of the six sections of the extruder body is 130-180 ℃, the extruder is provided with a cooling water tank and a cutting machine, and a tractor is synchronously matched with the extruder. The tractor is used for improving the propelling force, and a larger propelling force is needed when a wider wood-plastic plate is made.

The invention also provides a foaming mould for the wood-plastic plate, which is used for foaming the wood-plastic plate, the foaming mould comprises a mould head 1, a support mould 2, a mouth mould 3 and a water jacket 4 which are sequentially arranged, and a core rod 5 is arranged in a cavity of the foaming mould. The extruded material enters the cavity from the die head 1, and enters the shaping die through the water jacket 4 after the secondary micro-foaming is finished.

As a further description of the above technical solution: the starting end of the core rod 5 is positioned in the cavity of the die head 1, the tail end of the core rod is positioned in the cavity of the die head 3, and the starting end of the core rod 5 is a flow guide section 51 with a triangular section. The extruded material enters the die cavity through the die head 1 and is cut when contacting with the guide section 51 of the core rod 5 to form a plurality of strands of feeding materials, and the plurality of strands of feeding materials in the die cavity are stirred in moving to strengthen the plasticizing effect.

As a further description of the above technical solution: a bracket 21 is arranged in the cavity of the bracket die 2, and the core rod 5 is fixed in the cavity of the foaming die by the bracket 21. The support 21 is connected to the inner wall of the support die 2 so that the mandrel 5 is not affected by the oscillation when the extrudate enters.

As a further description of the above technical solution: the die cavity in the die head 1 is a horizontal round table, and the inner diameter of the end face of the die cavity is larger than that of the die cavity in the die head.

As a further description of the above technical solution: the end face of the water jacket 4 is provided with a protruding insert 41, and the cavity extends to the end face of the insert 41. The insert 41 is embedded into a material inlet of the sizing die to realize butt joint, and the extruded material subjected to secondary micro foaming is guided into a cavity of the sizing die.

The invention has the advantages that: 1. the modified copolymerized polyphenyl alkene is adopted, the product formula is perfected, and the use requirements of high temperature and low temperature are met; 2. a foaming mold with a special structure is adopted to fully foam and fully plasticize the material; 3. through surface treatment such as thermal transfer printing, the attractiveness of the plate is improved, and less colors, patterned paths and the like are met; 4. the density of the board prepared by the preparation method is 0.9-1.15 g/cm³The product has the advantages of small thermal deformation coefficient, good stability, texture and no weight bias, and is more stable and more heavy when being assembled on the tabletop of the finished outdoor furniture.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A manufacturing method of a novel wood-plastic plate is characterized by comprising the following steps: the method comprises the following manufacturing procedures: s1, mixing the main material and the auxiliary material through a stirrer, transferring the mixture into a metering type feeder through an automatic feeding machine, and then feeding the mixture into a granulator for granulation to generate granulated materials; the main materials are modified copolymerized polyphenyl alkene and fine wood powder, wherein the modified copolymerized polyphenyl alkene accounts for 20% -45%, and the fine wood powder accounts for 50% -80%; the auxiliary materials comprise 1-3% of compatilizer, 1-3% of lubricant, 0.5-2% of ultraviolet-resistant antioxidant and 1-3% of toner;

2. The manufacturing method of the novel wood-plastic panel as claimed in claim 1, wherein: the melt index of the modified copolymerized polyphenylene is less than 0.5g/min, and the mesh number of the fine wood powder is 25-135 meshes.

3. The manufacturing method of the novel wood-plastic panel as claimed in claim 1, wherein: in the steps S1 and S2, the stirrer is a high-speed mixer, the granulator is a parallel double-screw machine, and the granulation temperature is controlled to be 150-280 ℃.

4. The manufacturing method of the novel wood-plastic panel as claimed in claim 1, wherein: in the step S3, the extruder is a conical double-screw extruder, the temperature of the four sections of the extruder body is 150-250 ℃, the temperature of the six sections of the extruder body is 130-180 ℃, the extruder is provided with a cooling water tank and a cutting machine, and a tractor is synchronously matched with the extruder.

5. A mold for foaming a wood-plastic panel, for foaming the novel wood-plastic panel according to any one of claims 1 to 5, wherein: the foaming mold comprises a mold head, a bracket mold, an opening mold and a water jacket which are sequentially arranged, and a core rod is arranged in a cavity of the foaming mold.

6. The mold for foaming a wood-plastic panel according to claim 5, wherein: the starting end of the core rod is positioned in a cavity of the die head, the tail end of the core rod is positioned in a cavity of the die head, and the starting end of the core rod is a flow guide section with a triangular section.

7. The mold for foaming a wood-plastic panel according to claim 5, wherein: and a bracket is arranged in the cavity of the bracket die, and the core rod is fixed in the cavity of the foaming die by the bracket.

8. The mold for foaming a wood-plastic panel according to claim 5, wherein: the die cavity in the die head is a horizontal round table, and the inner diameter of the end face of the die cavity is larger than that of the die cavity in the die head.

9. The mold for foaming a wood-plastic panel according to claim 5, wherein: the end face of the water jacket is provided with a convex insert, and the cavity extends to the end face of the insert.