CN112080154A - Three-dimensional printing material based on wood powder raw material and preparation and printing methods thereof - Google Patents

Abstract

The invention relates to the field of three-dimensional printing and forming, and provides a three-dimensional printing and forming printing material based on wood flour raw materials and a preparation method and a printing method thereof, wherein the printing material comprises composite wood flour, the composite wood flour consists of 100 parts of wood flour raw materials with the grain diameter within 200 meshes, 10-20 parts of PVA solution with the concentration of 70% or equivalent AR-level cold water-soluble PVA1788 powder with the grain diameter of 200-300 meshes, 5-10 parts of nano-silica powder with the grain diameter of 10-50nm, 5 parts of natural resin, 5-10 parts of AR-level soluble starch and 10-15 parts of auxiliary agents; printing ink the printing ink was prepared according to the following plasma water: surfactant Surfynol 465: the printing ink is prepared according to the proportion of diethylene glycol 87:5:8, the viscosity value is in the range of 1-10 mPa.s, and the surface tension value is in the range of 25-60 mN.m^‑1And (3) a range. The invention can effectively improve the indexes of the powder such as the particle size, the powder distribution condition, the fluidity and the like by modifying the powder, and meet the requirements of the 3DP forming process on materials.

Description

A kind of printing material formed by three-dimensional printing based on wood powder raw material and its preparation and printing method

technical field

The invention relates to the field of three-dimensional printing and forming, in particular to a wood powder material that can be used for three-dimensional printing and forming and a preparation and printing method thereof.

Background technique

Wood flour, which is ground and ground from wood, generally refers to the leftover waste from wood processing in sawmills, furniture factories, MDF factories, and multi-layer board factories. Although it is waste, it has a wide range of uses and is a new energy-saving and environmentally friendly material. It can be used as a raw material for mosquito coils, leather, clothing, papermaking, electrical appliances, daily necessities, coatings, cat litter, chemicals, insulation materials, outdoor decoration materials, building materials and other products. Red sandalwood, huanghuali, mahogany and other woods are extremely precious. The wood patterns are beautiful, the material is hard and durable. It is used for precious furniture and arts and crafts. The demand is large and the output is very small. more people's attention. Whether these corner scraps can continue to become furniture or handicrafts has become an important application.

Additive Manufacturing (AM) technology, also known as 3D printing (3D Printing) technology, is a fusion of computer-aided design, material processing and forming technology, based on digital model files, through software and CNC systems. The metal materials, non-metal materials and medical biological materials are piled up layer by layer according to extrusion, sintering, melting, light curing, spraying, etc., to produce the manufacturing technology of physical objects. According to different process principles, there are hundreds of specific forming processes. Among them, the three-dimensional printing (Three-Dimensional Printing, 3DP) technology, also known as the three-dimensional inkjet printing method, uses a binder (such as silica gel, PVA, PVP, etc.) to "print" the two-dimensional cross-section of a series of parts on the powder material through the nozzle. above.

Currently, 3DP technology uses widely used powder materials including gypsum powder, ceramic powder and metal powder, while wood powder is rarely used. The main reason for not being widely used is the powder characteristics of wood powder, such as large particle size, uneven particle size distribution, irregular powder shape, low sphericity, etc. Especially in the printing process, the poor fluidity of wood powder affects the application. important reason.

The purpose of the invention is to carry out deep processing of wood, especially the waste of precious woods such as red sandalwood, huanghuali, mahogany, etc., and to modify the powder, so that the particle size, powder distribution, fluidity and other indicators can be effectively improved , to meet the material requirements of the 3DP forming process, and then 3D print a variety of exquisite special-shaped furniture and exquisite handicrafts.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a three-dimensional printing material based on wood powder raw material and a preparation method thereof. Wood scrap is used as a raw material, and wood powder is modified to make its particle size, powder distribution, fluidity, etc. The indicators can be effectively improved to meet the material requirements of the 3DP forming process, and then 3D print a variety of exquisite special-shaped furniture and exquisite handicrafts.

The technical solution provided by the present invention is as follows: a printing material formed by three-dimensional printing based on wood powder raw materials, including composite wood powder, the composite wood powder is composed of 100 parts of wood powder raw materials with a particle size of wood powder within 200 mesh, 10 parts of wood powder -20 parts of PVA solution with a concentration of 70% or an equivalent amount of AR grade cold water-soluble PVA1788 powder with a particle size of 200-300 mesh, 5-10 parts of nano-silica powder with a particle size of 10-50nm, 5 parts It is composed of natural resin, 5-10 parts of AR grade soluble starch and 10-15 parts of auxiliary agent.

Further, the particle size of the composite wood powder is within 0.05mm.

Further, the auxiliary agent consists of 40% toughening agent, 35% antioxidant and 25% coupling agent.

Preferably, the toughening agent is chlorinated polyethylene, the antioxidant is vitamin E, and the coupling agent is titanate.

Preferably, the wood flour raw material is wood processing waste, and the wood flour raw material includes at least one of red sandalwood, huanghuali, and mahogany.

Further, it also includes printing ink, the viscosity value of the printing ink is in the range of 1-10 mPa·s, and the surface tension value is in the range of 25-60 mN·m ^-1 .

Preferably, the printing ink includes plasma water, surfactant Surfynol465 and diethylene glycol, and the ratio of the plasma water, surfactant Surfynol465 and diethylene glycol is 87:5:8.

The present invention also provides a method for preparing a printing material formed by three-dimensional printing based on wood flour raw materials, comprising the following steps:

(1) mechanically pulverize 100 parts of scraps of precious woods such as red sandalwood, huanghuali, mahogany, etc., and reduce the particle size to 50-80 mesh;

(2) For further machining, use grinding equipment and zirconia grinding balls and grinding jars with a ball diameter in the range of 10-30mm, 300-500 rpm, and 360 ° full grinding for 20-30 hours to make wood powder The particle size is within 200 mesh;

(3) In the grinding equipment, add 10-20 parts of PVA solution with a concentration of 70% or an equivalent amount of 200-300 mesh AR grade cold water-soluble PVA1788 powder; the particle size of the nano-silica powder is 10-50nm, 5 -10 parts; 5 parts of natural resin; 5-10 parts of AR grade soluble starch; 10-15 parts of auxiliary agent; the auxiliary agent is composed of 40% toughening agent, 35% antioxidant and 25% coupling agent by weight percentage , the toughening agent is chlorinated polyethylene; the antioxidant is vitamin E; the coupling agent is titanate; 1 minute speed, 360° all-round grinding for 5-8 hours;

(4) Dry the above-mentioned modified composite wood powder in an electric heating blast drying oven for 3-5 hours, at a temperature of 40-60 °C, and then continue to grind, using zirconia grinding balls in the range of 3-8 mm, 300-500 rpm Rotation speed per minute, 360° all-round grinding for 5-8 hours, and dispersing with a high-speed disperser for 10-15 minutes;

(5) further sieve, use 280-300 mesh screen to make the particle size of wood powder within 0.05mm, and be in a normal distribution, and then carry out vacuum packaging;

(6) The printing ink is prepared according to the ratio of plasma water: Surfactant Surfynol465: Diethylene glycol = 87:5:8, so that the viscosity value is in the range of 1-10mPa·s, and the surface tension value is in the range of 87:5:8. 25-60mN·m ^-1 range.

The present invention also provides a method for printing a printing material formed by the above-mentioned three-dimensional printing based on wood flour raw material, comprising the following steps:

S1. Mix 100 parts of wood powder raw materials with a particle size of wood powder within 200 mesh, 10-20 parts of PVA solution with a concentration of 70% or an equivalent amount of AR grade cold water-soluble PVA1788 powder with a particle size of 200-300 mesh, 5-10 parts of nano-silica powder with a particle size of 10-50nm, 5 parts of natural resin, 5-10 parts of AR grade soluble starch and 10-15 parts of auxiliary agents are mixed and processed. The particle size is 0.05. The composite wood powder within mm is added to the powder box of the 3D printing forming equipment;

S2, inject the printing ink prepared by plasma water, surfactant Surfynol465 and diethylene glycol in a ratio of 87:5:8 into the ink tank of the three-dimensional printing forming equipment;

S3. Import the designed three-dimensional model into the slicing software to generate a nozzle motion trajectory file, and after loading it into the three-dimensional printing forming equipment, the nozzle inkjet is bonded to the composite wood powder for printing;

S4. After printing, post-processing is carried out. After printing, let stand for 3 hours, take out the printing blank, clean up the residual wood powder, soak or spray the blank in UV glue, and then put it in UV curing equipment for 3-5 minutes. Finally, the outer surface is hand-polished to shape.

Compared with the prior art, the present invention has the following beneficial effects:

(1) A printing material based on three-dimensional printing of wood powder raw materials of the present invention, by using wood waste as a raw material, the wood powder is modified to make its particle size, powder distribution, fluidity and other indicators It can be effectively improved to meet the material requirements of the 3DP forming process, and then 3D print a variety of exquisite special-shaped furniture and exquisite handicrafts.

(2) A kind of printing material based on wood powder raw material three-dimensional printing of the present invention, the use of modified wood powder not only has a suitable particle size, but also after adding various preparations and contacting with ink, the bonding performance is further improved, and the fluidity is improved. It is also greatly improved and is suitable for powder spreading in the printing process of 3D printing forming equipment.

(3) A preparation method of a printing material based on three-dimensional printing and forming of wood powder raw materials of the present invention is to give full play to the advantages of three-dimensional printing forming technology, is suitable for complex forming, and meets the modeling needs of precious handicrafts, and most This method can be used for powder materials that can be formed by bonding with a binder.

(4) A preparation method of a printing material formed by three-dimensional printing based on wood powder raw materials of the present invention, the wood powder prepared by the method has suitable particle size, uniform distribution and good fluidity, and the modified wood powder has a certain degree of It retains the essence of wood powder, ensures the compactness of the powder, and the formed parts have better mechanical properties. The prepared ink is economical and applicable, and the effect is good. The parts after UV glue post-treatment can be remanufactured or recreated, fully demonstrating the advantages of precious wood powder.

Detailed ways

The present invention will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

Example 1

A printing material formed by three-dimensional printing based on wood powder raw materials, including composite wood powder, the composite wood powder is composed of 100 parts of wood powder raw materials with a particle size of wood powder within 200 meshes, and 10 parts of PVA with a concentration of 70% Solution or equivalent amount of AR grade cold water soluble PVA1788 powder with particle size of 200-300 mesh, 10 parts of nano-silica powder with particle size of 10-50nm, 5 parts of natural resin, 5 parts of AR grade soluble starch and 15 parts of the auxiliary composition.

The particle size of the composite wood powder is within 0.05mm.

The auxiliary agent consists of 40% toughening agent, 35% antioxidant and 25% coupling agent.

The toughening agent is chlorinated polyethylene, the antioxidant is vitamin E, and the coupling agent is titanate.

The wood powder raw material is wood processing corner waste, and the wood powder raw material is selected from red sandalwood.

The printing material further includes printing ink, the viscosity value of the printing ink is in the range of 1-10 mPa·s, and the surface tension value is in the range of 25-60 mN·m ^-1 .

The printing ink includes plasma water, surfactant Surfynol465 and diethylene glycol, and the ratio of the plasma water, surfactant Surfynol465 and diethylene glycol is 87:5:8.

The present invention also provides a method for preparing a printing material formed by three-dimensional printing based on wood flour raw materials, comprising the following steps:

(1) 100 parts of corner wastes of red sandalwood are mechanically pulverized, and the particle size is reduced to 50-80 mesh;

(2) For further machining, use grinding equipment and zirconia grinding balls and grinding jars with a ball diameter in the range of 10-30mm, 300-500 rpm, and 360 ° full grinding for 20-30 hours to make wood powder The particle size is within 200 mesh;

(3) In the grinding equipment, add 10 parts of PVA solution with a concentration of 70% or an equivalent 200-300 purpose AR grade cold water-soluble PVA1788 powder; the particle size of the nano-silica powder is 10-50nm, 10 parts; 5 parts of natural resin; 5 parts of AR grade soluble starch; 15 parts of adjuvant; the adjuvant is composed of 40% toughening agent, 35% antioxidant and 25% coupling agent by weight percentage, and the toughening agent is Chlorinated polyethylene; the antioxidant is vitamin E; the coupling agent is titanate; and use zirconia grinding balls in the range of 3-8mm, 300-500 rpm, 360° omnidirectional Grind for 5-8 hours;

(4) Dry the above-mentioned modified composite wood powder in an electric heating blast drying oven for 3-5 hours, at a temperature of 40-60 °C, and then continue to grind, using zirconia grinding balls in the range of 3-8 mm, 300-500 rpm Rotation speed per minute, 360° all-round grinding for 5-8 hours, and dispersing with a high-speed disperser for 10-15 minutes;

(5) further sieve, use 280-300 mesh screen to make the particle size of wood powder within 0.05mm, and be in a normal distribution, and then carry out vacuum packaging;

(6) The printing ink is prepared according to the ratio of plasma water: Surfactant Surfynol465: Diethylene glycol = 87:5:8, so that the viscosity value is in the range of 1-10mPa·s, and the surface tension value is in the range of 87:5:8. 25-60mN·m ^-1 range.

Example 2

A printing material formed by three-dimensional printing based on wood powder raw materials, comprising composite wood powder, the composite wood powder is composed of 100 parts of wood powder raw materials with a particle size of wood powder within 200 meshes, and 15 parts of PVA with a concentration of 70% Solution or equivalent amount of AR grade cold water soluble PVA1788 powder with particle size of 200-300 mesh, 8 parts of nano-silica powder with particle size of 10-50nm, 5 parts of natural resin, 8 parts of AR grade soluble starch and 12 parts of adjuvant composition.

The particle size of the composite wood powder is within 0.05mm.

The auxiliary agent consists of 40% toughening agent, 35% antioxidant and 25% coupling agent.

The toughening agent is chlorinated polyethylene, the antioxidant is vitamin E, and the coupling agent is titanate.

The wood flour raw material is wood processing corner waste, and the wood flour raw material is huanghuali.

The printing material further includes printing ink, the viscosity value of the printing ink is in the range of 1-10 mPa·s, and the surface tension value is in the range of 25-60 mN·m ^-1 .

The printing ink includes plasma water, surfactant Surfynol465 and diethylene glycol, and the ratio of the plasma water, surfactant Surfynol465 and diethylene glycol is 87:5:8.

The present invention also provides a method for preparing a printing material formed by three-dimensional printing based on wood flour raw materials, comprising the following steps:

(1) mechanically pulverize 100 parts of huanghuali's corner waste, reduce particle diameter to 50-80 mesh;

(2) For further machining, use grinding equipment and zirconia grinding balls and grinding jars with a ball diameter in the range of 10-30mm, 300-500 rpm, and 360 ° full grinding for 20-30 hours to make wood powder The particle size is within 200 mesh;

(3) In the grinding equipment, add 15 parts of PVA solution with a concentration of 70% or an equivalent amount of 200-300 purpose AR grade cold water-soluble PVA1788 powder; the particle size of the nano-silica powder is 10-50nm, 8 parts; 5 parts of natural resin; 8 parts of AR grade soluble starch; 12 parts of adjuvant; the adjuvant is composed of 40% toughening agent, 35% antioxidant and 25% coupling agent by weight, and the toughening agent is Chlorinated polyethylene; the antioxidant is vitamin E; the coupling agent is titanate; and use zirconia grinding balls in the range of 3-8mm, 300-500 rpm, 360° omnidirectional Grind for 5-8 hours;

(4) Dry the above-mentioned modified composite wood powder in an electric heating blast drying oven for 3-5 hours, at a temperature of 40-60 °C, and then continue to grind, using zirconia grinding balls in the range of 3-8 mm, 300-500 rpm Rotation speed per minute, 360° all-round grinding for 5-8 hours, and dispersing with a high-speed disperser for 10-15 minutes;

(5) further sieve, use 280-300 mesh screen to make the particle size of wood powder within 0.05mm, and be in a normal distribution, and then carry out vacuum packaging;

(6) The printing ink is prepared according to the ratio of plasma water: Surfactant Surfynol465: Diethylene glycol = 87:5:8, so that the viscosity value is in the range of 1-10mPa·s, and the surface tension value is in the range of 87:5:8. 25-60mN·m ^-1 range.

Example 3

A printing material formed by three-dimensional printing based on wood powder raw materials, comprising composite wood powder, the composite wood powder is composed of 100 parts of wood powder raw materials with a particle size of wood powder within 200 meshes, and 20 parts of PVA with a concentration of 70% Solution or equivalent amount of AR grade cold water soluble PVA1788 powder with particle size of 200-300 mesh, 5 parts of nano-silica powder with particle size of 10-50nm, 5 parts of natural resin, 10 parts of AR grade soluble starch and 10 parts of adjuvant composition.

The particle size of the composite wood powder is within 0.05mm.

The auxiliary agent consists of 40% toughening agent, 35% antioxidant and 25% coupling agent.

The toughening agent is chlorinated polyethylene, the antioxidant is vitamin E, and the coupling agent is titanate.

The wood flour raw material is wood processing edge waste, and the wood flour raw material includes at least one of red sandalwood, huanghuali and mahogany.

The printing material further includes printing ink, the viscosity value of the printing ink is in the range of 1-10 mPa·s, and the surface tension value is in the range of 25-60 mN·m ^-1 .

The printing ink includes plasma water, surfactant Surfynol465 and diethylene glycol, and the ratio of the plasma water, surfactant Surfynol465 and diethylene glycol is 87:5:8.

The present invention also provides a method for preparing a printing material formed by three-dimensional printing based on wood flour raw materials, comprising the following steps:

(1) mechanically pulverize 100 parts of the corner waste of mahogany, and reduce the particle size to 50-80 mesh;

(2) For further machining, use grinding equipment and zirconia grinding balls and grinding jars with a ball diameter in the range of 10-30mm, 300-500 rpm, and 360 ° full grinding for 20-30 hours to make wood powder The particle size is within 200 mesh;

(3) In the grinding equipment, add 20 parts of PVA solution with a concentration of 70% or an equivalent amount of 200-300 purpose AR grade cold water-soluble PVA1788 powder; the particle size of the nano-silica powder is 10-50nm, 5 parts; 5 parts of natural resin; 10 parts of AR grade soluble starch; 10 parts of auxiliary agent; the auxiliary agent is composed of 40% toughening agent, 35% antioxidant and 25% coupling agent by weight. The toughening agent is Chlorinated polyethylene; the antioxidant is vitamin E; the coupling agent is titanate; and use zirconia grinding balls in the range of 3-8mm, 300-500 rpm, 360° omnidirectional Grind for 5-8 hours;

(4) Dry the above-mentioned modified composite wood powder in an electric heating blast drying oven for 3-5 hours, at a temperature of 40-60 °C, and then continue to grind, using zirconia grinding balls in the range of 3-8 mm, 300-500 rpm Rotation speed per minute, 360° all-round grinding for 5-8 hours, and dispersing with a high-speed disperser for 10-15 minutes;

(5) further sieve, use 280-300 mesh screen to make the particle size of wood powder within 0.05mm, and be in a normal distribution, and then carry out vacuum packaging;

(6) The printing ink is prepared according to the ratio of plasma water: Surfactant Surfynol465: Diethylene glycol = 87:5:8, so that the viscosity value is in the range of 1-10mPa·s, and the surface tension value is in the range of 87:5:8. 25-60mN·m ^-1 range.

The purpose of the preliminary pulverization in step (1) in the above embodiment 1-3 is to facilitate the grinding of the grinding machine, reduce the grinding time, and improve the grinding efficiency and quality.

The step (2) in the above embodiment 1-3 is to finely grind the wood powder and make the particle size of the wood powder within 200 meshes, in order to basically reach the required range of the particle size of the powder by the 3DP process.

In the above-mentioned embodiment 1-3, step (3) is to add composite material to the grinding equipment, wherein the use of PVA solution or powder has better interfacial activity and bonding performance, and plays an indirect bonding role in the modified wood powder. On the one hand, starch enhances the bonding performance of the modified wood powder, and on the other hand, it improves the fluidity of the modified wood powder. During the grinding process, the nano-silica powder will evenly cover the surface of the wood powder, which can effectively prevent the Direct contact causes agglomeration and acts as a fluidity modifier.

The step (4) in the above-mentioned embodiment 1-3 is the secondary grinding and dispersion of the wood powder after drying and forming, in order to make the wood powder particles bound with various additives uniform, so as to facilitate spreading and printing on the three-dimensional printing forming equipment. .

In the step (5) of the above examples 1-3, through further screening and separation, the composite wood powder that meets the printing accuracy is selected, which further ensures that the obtained modified wood powder particles have good fluidity.

In the above grinding and processing steps, according to different preparation schemes, the HYL-1001 multifunctional powder physical property testing instrument is used to test the powder flow characteristics, and the BT-9300ST laser particle size distribution analyzer is used to test its particle size and range. And the test results are shown in Table 1.

Table 1 Characteristic experiment of modified wood flour

It can be seen from the comparison of the above four schemes that with the reduction of the quality of wood flour and the increase of the quality of other additives, the bulk density of the mixed powder increases, the angle of repose and the degree of compression decrease, indicating that the fluidity becomes better. Among them, the bulk density is large, indicating that the powder is more compact in the natural packing state, and the compact powder is conducive to the improvement of the forming quality. The angle of repose has the greatest influence on the fluidity of the powder. The smaller the angle of repose, the better the fluidity of the powder. The smaller the compressibility of the material, the better the fluidity of the material powder. It can be seen from the comparison of schemes 2 and 3 that the increase of the rotational speed has a great influence on the fluidity. When the rotational speed is 500r/min, the angle of repose of the grinding time is basically unchanged for 3h and 5h, and the fluidity is basically stable. The particle size and range decrease correspondingly with the increase of the rotation speed of the ball mill, and a properly reduced particle size helps to enhance the bonding effect. According to the comprehensive analysis of Table 1, the modified wood powder prepared by No. 3 is more suitable for three-dimensional printing.

Step (6) in the above-mentioned embodiment 1-3 is prepared for the ink used for printing. This proportioning scheme is not only conducive to the ejection of the inkjet print head, the ink discharge is smooth, the nozzle hole is not easily blocked after long-term use, and the utilization rate of the nozzle is improved. It is easy to bond with the above modified wood powder materials.

The specific experimental scheme and test results are as follows:

①Under the condition that the content of surfactant Surfynol465 remains unchanged, refer to the industry standard QB/T 2730.1-2013 of "ink for inkjet printers" to study the effect of diethylene glycol content on the viscosity, surface tension, bonding effect and nozzle life of the binder. Impact. The viscosity of the adhesive in this experiment was tested with the HAAKE ViscotesterE rotational viscometer from Thermo Fisherscientific, and the surface tension of the adhesive was tested with the BZY-1 automatic meter/interfacial tension meter produced by Shanghai Hengping Instrument Factory. . The specific formula and test results are shown in Table 2.

Table 2 Binder preparation test and results

As can be seen from Table 2, as the content of diethylene glycol increases, the viscosity value also increases, and the surface tension changes. The viscosity values of No. 1, No. 2 and No. 3 adhesives are all within the reference range. The surface tension of No. 2 adhesive is suitable, the ink discharge is smooth and the printing quality can be guaranteed. The test results show that increasing the content of diethylene glycol helps to increase the viscosity of the binder, but it will affect the surface tension of the mixed solution, thereby affecting the service life of the nozzle.

② Under the condition of constant diethylene glycol content, the influence of surfactant Surfynol465 on the viscosity value, surface tension, bonding effect and nozzle life of the adhesive was studied. The specific formula and test results are shown in Table 3.

Table 3 Binder preparation test

It can be known from Table 3 that when the content of diethylene glycol remains unchanged, when the content of surfactant increases, the surface tension value of the mixed solution decreases, but the decrease is not obvious. At the same time, as the viscosity value increases, the bonding effect increases. The test results show that an appropriate increase in a small amount of surfactant can reduce the surface tension of the mixed solution and effectively improve the life of the nozzle, but the more the better, the surface tension value will not always decrease after reaching a certain amount, but will increase slightly. Increasing the surfactant content will also slightly increase the viscosity value, which can improve the printing quality to a limited extent.

To sum up, according to the viscosity value, surface tension, bonding effect and the service life of the nozzle, the No. 2 (No. 5) binder formula, namely plasma water: Surfactant Surfynol465: Diethylene glycol = 87:5:8, its viscosity The value (room temperature) is 3.505mPa·s, the surface tension is 54.72mN·m ^-1 , the bonding effect is good, and the service life of the nozzle is the longest. This formula is selected for subsequent blank printing.

Example 4

The present invention also provides a method for printing a printing material formed by the above-mentioned three-dimensional printing based on wood flour raw material, comprising the following steps:

S1. Mix 100 parts of wood powder raw materials with a particle size of wood powder within 200 mesh, 10-20 parts of PVA solution with a concentration of 70% or an equivalent amount of AR grade cold water-soluble PVA1788 powder with a particle size of 200-300 mesh, 5-10 parts of nano-silica powder with a particle size of 10-50nm, 5 parts of natural resin, 5-10 parts of AR grade soluble starch and 10-15 parts of auxiliary agents are mixed and processed. The particle size is 0.05. The composite wood powder within mm is added to the powder box of the 3D printing forming equipment;

S2, inject the printing ink prepared by plasma water, surfactant Surfynol465 and diethylene glycol in a ratio of 87:5:8 into the ink tank of the three-dimensional printing forming equipment;

S3. Import the designed three-dimensional model into the slicing software to generate a nozzle motion trajectory file, and after loading it into the three-dimensional printing forming equipment, the nozzle inkjet is bonded to the composite wood powder for printing;

S4. After printing, post-processing is carried out. After printing, let stand for 3 hours, take out the printing blank, clean up the residual wood powder, soak or spray the blank in UV glue, and then put it in UV curing equipment for 3-5 minutes. Finally, the outer surface is hand-polished to shape.

The innovations and beneficial effects of the present invention include but are not limited to the following aspects:

(1) Maximize the use of precious wood waste resources to make the best use of resources, rational and effective use of resources, and reduce the cost of raw materials.

(2) Give full play to the advantages of 3D printing forming technology, suitable for complex forming, and meet the needs of precious handicraft modeling. In theory, this method can be used for most powder materials that can be formed by bonding with adhesives. But the key is that the powder material should be suitable for powder coating, and the ink should be suitable for the jetting of the inkjet print head, and the powder material should be effectively bonded. Powder preparation and ink preparation are key technologies.

(3) The modified wood powder not only has a suitable particle size, but also after adding various preparations and contacting the ink, the bonding performance is further improved, and the fluidity is also greatly improved, which is suitable for powder spreading in the printing process of 3D printing forming equipment.

(4) UV glue post-processing solves the actual problem of low strength of the printed body, which is convenient for re-creation. In the additive manufacturing technology, non-high-energy laser beams are used as energy sources, and the strength of the parts is not high.

To sum up, the present invention provides a printing material based on wood powder raw material for three-dimensional printing and its preparation and printing method. The wood powder prepared by the preparation method has suitable particle size, uniform distribution and good fluidity. The wood powder retains the essence of wood powder to a certain extent, ensures the compactness of the powder, and the formed parts have better mechanical properties. The prepared ink is economical and applicable, and the effect is good. The parts after UV glue post-treatment can be remanufactured or recreated, fully showing the advantages of precious wood powder, meeting the material requirements of the 3DP forming process, and then 3D printing various exquisite special-shaped furniture and exquisite handicrafts.

The foregoing specification illustrates and describes preferred embodiments of the present invention, and as previously stated, it should be understood that the present invention is not limited to the form disclosed herein, and should not be construed as an exclusion of other embodiments, but may be used in a variety of other Combinations, modifications and environments are possible within the scope of the inventive concepts described herein, from the above teachings or from skill or knowledge in the relevant fields. However, modifications and changes made by those skilled in the art do not depart from the spirit and scope of the present invention, and should all fall within the protection scope of the appended claims of the present invention.

Claims (9)

1. The three-dimensional printing and forming printing material based on the wood powder raw material comprises composite wood powder, wherein the composite wood powder consists of 100 parts of wood powder raw material with the wood powder grain size within 200 meshes, 10-20 parts of PVA solution with the concentration of 70% or equivalent AR-level cold water-soluble PVA1788 powder with the grain size of 200-300 meshes, 5-10 parts of nano-silica powder with the grain size of 10-50nm, 5 parts of natural resin, 5-10 parts of AR-level soluble starch and 10-15 parts of auxiliary agent.

2. The three-dimensional print-formed printing material based on wood flour raw material as claimed in claim 1, characterized in that the particle size of the composite wood flour is within 0.05 mm.

3. Three-dimensional print formed printed material based on wood flour feedstock according to claim 2 characterised in that the auxiliaries consist of 40% toughening agent, 35% antioxidant and 25% coupling agent.

4. The three-dimensional printed formed printing material based on wood flour as raw material of claim 3, wherein the toughening agent is chlorinated polyethylene, the antioxidant is vitamin E, and the coupling agent is titanate.

5. The three-dimensional print formed printing material based on wood flour raw material as claimed in claim 4, wherein the wood flour raw material is wood processing leftover waste, and the wood flour raw material comprises at least one of rosewood, rose wood and redwood.

6. The three-dimensional print-formed printing material based on wood flour raw material as claimed in claim 5, further comprising a printing ink having a viscosity value in the range of 1 to 10mPa s and a surface tension value in the range of 25 to 60 mN-m^-1。

7. The three-dimensional printed shaped printing material based on wood flour raw material as claimed in claim 6, characterized in that the printing ink comprises plasma water, surfactant Surfynol465 and diethylene glycol, wherein the ratio of the plasma water, the surfactant Surfynol465 and the diethylene glycol is 87:5: 8.

8. A preparation method of a three-dimensional printing and forming printing material based on wood flour raw materials comprises the following steps:

(1) mechanically pulverizing 100 parts of leftover materials of precious wood such as red sandalwood, yellow rose, rosewood and the like, and reducing the particle size to 50-80 meshes;

(2) further machining, grinding equipment, zirconia grinding balls with the ball diameter of 10-30mm and a grinding tank are used, the rotation speed is 300-500 r/min, and the wood powder is fully ground for 20-30 hours in a 360-degree all-round mode, so that the particle size of the wood powder is within 200 meshes;

(3) adding 10-20 parts of PVA solution with the concentration of 70% or equivalent AR grade cold water soluble PVA1788 powder with 200-300 meshes into grinding equipment; the grain diameter of the nano silicon dioxide powder is 10-50nm, and 5-10 parts; 5 parts of natural resin; 5-10 parts of AR-grade soluble starch; 10-15 parts of an auxiliary agent; the auxiliary agent consists of 40 wt% of a toughening agent, 35 wt% of an antioxidant and 25 wt% of a coupling agent, wherein the toughening agent is chlorinated polyethylene; the antioxidant is vitamin E; the coupling agent is titanate; and using zirconia grinding balls with the range of 3-8mm, 300-500 rpm of rotation speed, 360 degrees of all-round grinding for 5-8 hours;

(4) drying the modified composite wood powder in an electric heating air blast drying oven for 3-5h at 40-60 ℃, then continuously grinding, using zirconium oxide grinding balls with the range of 3-8mm, rotating at the speed of 300 plus 500r/min at 360 ℃ for 5-8 h in an all-dimensional way, and dispersing for 10-15 min by using a high-speed dispersion machine;

(5) further sieving, namely using a 280-300-mesh sieve to ensure that the particle size of the wood powder is within 0.05mm and normally distributed, and then carrying out vacuum packaging;

(6) preparing ink for printing according to the following steps of: surfactant Surfynol 465: the printing ink is prepared according to the proportion of diethylene glycol 87:5:8, the viscosity value is in the range of 1-10 mPa.s, and the surface tension value is in the range of 25-60 mN.m^-1And (3) a range.

9. A printing method of a three-dimensional printing formed printing material based on wood flour raw materials comprises the following steps:

s1, adding composite wood flour with the grain diameter within 0.05mm, which is prepared by mixing and processing 100 parts of wood flour raw material with the grain diameter within 200 meshes, 10-20 parts of PVA solution with the concentration of 70 percent or equivalent AR grade cold water soluble PVA1788 powder with the grain diameter of 200-300 meshes, 5-10 parts of nano-silica powder with the grain diameter of 10-50nm, 5 parts of natural resin, 5-10 parts of AR grade soluble starch and 10-15 parts of auxiliary agent, into a powder box of three-dimensional printing forming equipment;

s2, injecting printing ink prepared from plasma water, surfactant Surfynol465 and diethylene glycol according to the ratio of 87:5:8 into an ink tank of three-dimensional printing forming equipment;

s3, importing the designed three-dimensional model into slicing software to generate a spray head motion trail file, and after loading the spray head motion trail file into three-dimensional printing forming equipment, enabling the spray head to jet ink and the composite wood powder to be bonded for printing;

and S4, performing post-treatment after printing, standing for 3 hours after printing, taking out a printed blank, cleaning residual wood powder, soaking or spraying the blank in UV glue, putting the blank into UV curing equipment for 3-5 minutes, and finally manually polishing and forming the outer surface.