阅读说明：本技术 用于3d打印的组合物、复合材料及其制备方法 (Composition, composite material and preparation method for 3D printing ) 是由 时留新 刘子月 胡健安 梁权峰 诸葛荣夏 梅璐雨 宋秀丽 于 2019-10-09 设计创作，主要内容包括：一种用于3D打印的组合物、复合材料及其制备方法,属于3D打印领域。复合材料以用于3D打印的组合物为主要成分制成,组合物包括微纳化的植物纤维和聚乳酸。复合材料的制备方法包括：将含有微纳化的植物纤维的分散液与聚乳酸混合,去除分散液中含有的溶剂后进行烘干。其能提高复合材料的力学性能,且能够提高复合材料的吸水性能,增加其降解速率、提高其生物相容性。(A kind of composition for 3D printing, composite material and preparation method, belong to 3D printing field.Composite material is made using the composition for 3D printing of main component, and composition includes the plant fiber and polylactic acid of micro-nano.The preparation method of composite material includes: to mix the dispersion liquid of the plant fiber containing micro-nano with polylactic acid, is dried after removing the solvent contained in dispersion liquid.Its mechanical property that can improve composite material, and can be improved the water absorbing properties of composite material, increase its degradation rate, improve its biocompatibility.)

1. a kind of composition for 3D printing, which is characterized in that the composition includes the plant fiber and poly- cream of micro-nano Acid.

2. the composition according to claim 1 for 3D printing, which is characterized in that the plant fiber of the micro-nano with The weight ratio of the polylactic acid is (1~4): (6~9)；

Optionally, the weight ratio of the plant fiber of the micro-nano and the polylactic acid is (2~3): (7~8)；

It optionally, include length is 300~800 μm, width is 25~40 μm micron order in the plant fiber of the micro-nano The nano level plant fiber that plant fiber and length are 100~900nm, width is 30~40nm；

Optionally, the plant fiber of the micro-nano is handled to obtain by poplar alkaline hydrogen peroxide chemical mechanical pulp through micro-nano.

3. the composition according to claim 1 or 2 for 3D printing, which is characterized in that the composition further includes idol Join agent；Optionally, the coupling agent includes silane coupling agent or titante coupling agent；Optionally, the coupling agent is described 0.5~3wt% of the plant fiber of micro-nano；Optionally, the coupling agent be the micro-nano plant fiber 1~ 2wt%.

4. the composition according to claim 3 for 3D printing, which is characterized in that the composition further includes plasticising Agent；Optionally, the total weight of the plant fiber of the micro-nano and the polylactic acid is A, and the weight of the plasticizer is B, In, B:A=2.5%~15%；

Optionally, the plasticizer is selected from polyethylene glycol or ester plasticizer；Optionally, the ester plasticizer is selected from citric acid Any one of tributyl and dioctyl terephthalate.

5. a kind of composite material for 3D printing, which is characterized in that the composite material is any with the Claims 1 to 4 The composition for 3D printing described in is made of main component.

6. a kind of preparation method of the composite material for 3D printing, which is characterized in that the composite material by claim 1~ 2 described in any item compositions for 3D printing are made of main component, and the preparation method includes: that will contain the micro-nano The dispersion liquid of the plant fiber of change is mixed with the polylactic acid, is dried after removing the solvent contained in the dispersion liquid.

7. the preparation method of the composite material according to claim 6 for 3D printing, which is characterized in that will be containing described Before the dispersion liquid of the plant fiber of micro-nano is mixed with the polylactic acid, first by the dispersion of the plant fiber containing the micro-nano Liquid and coupling agent are mixed to get mixed liquor, and the mixed liquor is mixed under conditions of 30~70 DEG C with the polylactic acid；

Optionally, the coupling agent includes silane coupling agent or titante coupling agent；Optionally, the coupling agent is described micro- 0.5~3wt% of the plant fiber for receiving；Optionally, the coupling agent is 1~2wt% of the plant fiber of the micro-nano.

8. the preparation method of the composite material according to claim 6 or 7 for 3D printing, which is characterized in that containing The preparation method for stating the dispersion liquid of the plant fiber of micro-nano includes:

Plant fibre slurry liquid is discongested in water, is then dehydrated, sized mixing and mashing obtains the first slurries；

The mass concentration of plant fiber in first slurries is adjusted to 0.8%~1.2%, and carries out ultra micron and crushes To the second slurries；

The water in second slurries is displaced using acetone, methylene chloride is recycled to displace the acetone.

9. the preparation method of the composite material according to claim 7 for 3D printing, which is characterized in that the polylactic acid It is mixed as a solution with mixed liquor, the solvent of the solution is methylene chloride；

And/or the temperature of baking step is 50~90 DEG C.

10. the preparation method of the composite material according to claim 7 for 3D printing, which is characterized in that will be described mixed It further include that plasticizer is added to be mixed when conjunction liquid mixes under conditions of 30~70 DEG C with the polylactic acid；Optionally, described The total weight of the plant fiber of micro-nano and the polylactic acid is A, and the weight of the plasticizer is B, wherein B:A=2.5%~ 15%；Optionally, plasticizer is selected from polyethylene glycol or ester plasticizer.

Technical field

This application involves 3D printing field, in particular to it is a kind of for the composition of 3D printing, composite material and its Preparation method.

Background technique

3D printing material is the material base of 3D printing, and the technical bottleneck that limitation 3D printing further develops.Just Under the conditions of normal temperature and humidity, polylactic acid (English abbreviation PLA, full name in English polylactide) and its product are pole Its is stable；Certain environment and under the conditions of, polylactic acid can be completely decomposed into carbon dioxide and water, not cause to bear to environment Load.In recent years, polylactic acid is favored due to its good biodegradability by people, especially wide in medical field application It is general.Since it is with good thermal stability and melt flowability, fusion sediment type print form can be satisfied with.It therefore can The polylactic acid finished product of designated shape is prepared in conjunction with CAD software and 3D printer.But there are certain disadvantages for this technology: (1) gathering cream Acid is linear condensation product, and relative molecular weight distribution range is wider, and the mechanical property that will lead to 3D printing finished product is slightly worse.(2) There are a large amount of hydrophobic ester bonds in polylactic acid, hydrophilicity is poor, and the degradation cycle of printed material is long.

Summary of the invention

This application provides a kind of compositions for 3D printing, composite material and preparation method, can improve compound The mechanical property of material, and can be improved the water absorbing properties of composite material, increase its degradation rate, improve its biocompatibility.

Embodiments herein is achieved in that

In a first aspect, the embodiment of the present application provides a kind of composition for 3D printing, composition includes the plant of micro-nano Fibres and polylactic acid.

In the above-mentioned technical solutions, since there are a large amount of hydroxyls and carboxyl for the plant fibre surface of micro-nano, so that micro- There is the plant fiber for receiving highly polar and hydrophily and higher surface energy, the plant fiber and polylactic acid of micro-nano to be made After composite material, the plant fiber of micro-nano is distributed in polylactic acid, and when by external force, nanoscale fiber can hinder Hinder the dislocation motion of polylactic acid matrix, micron-sized plant fiber may act as entity and skeleton, is effectively transmitted, is held to external force By by matrix transmitting Lai payload, so as to improve the mechanical property of composite material.And the plant fiber of micro-nano Hydrophily can be improved the water absorbing properties of composite material, increases its degradation rate, improves its biocompatibility.

In a kind of possible embodiment, the plant fiber of micro-nano and the weight ratio of polylactic acid are (1~4): (6~ 9)。

In the above-mentioned technical solutions, after composite material is made in the plant fiber of the micro-nano of above-mentioned weight ratio and polylactic acid, The mechanical property and water absorbing properties of composite material can more efficiently be improved.Optionally, the plant fiber of micro-nano with it is described The weight ratio of polylactic acid is (2~3): (7~8).

In a kind of possible embodiment, in the plant fiber of micro-nano include length be 300~800 μm, width is The nano level plant fiber that 25~40 μm of micron order plant fiber and length is 100~900nm, width is 30~40nm.

In the above-mentioned technical solutions, the nanoscale fiber of above-mentioned size can preferably hinder the dislocation of polylactic acid matrix Movement, the micron-sized plant fiber of above-mentioned size preferably can effectively transmit external force, receiving by matrix transmitting Lai Payload.Optionally, the plant fiber of micro-nano is handled by poplar alkaline hydrogen peroxide chemical mechanical pulp through micro-nano It arrives.

In a kind of possible embodiment, composition further includes coupling agent.

In the above-mentioned technical solutions, coupling agent can connect the plant fiber of micro-nano and polylactic acid, so that micro- The plant fiber and polylactic acid for receiving combine well.The mechanical property and water imbibition of composite material can more efficiently be improved Can, increase its degradation rate, improve its biocompatibility.

Optionally, coupling agent includes silane coupling agent or titante coupling agent.

In the above-mentioned technical solutions, silane coupling agent can occur to hydrolyze the active polyhydroxy-alcohol of generation of reactive, polyhydroxy Base alcohol can be acted on by hydrogen bond and the hydroxyl of the plant fibre surface of micro-nano, and reduce the hydroxyl value of plant fibre surface Amount, reduces the polarity of plant fiber, the other end of silane coupling agent be can dissolve and be spread in the interface of polylactic acid, in plant Fiber and polylactic acid form stable covalent bond between the two, so that plant fiber and polylactic acid preferably combine.Titanate esters What the alkoxy of class coupling agent can capture the plant fiber of micro-nano forms chemical bond in conjunction with water, titante coupling agent The other end can be in conjunction with polylactic acid, so that the plant fiber of micro-nano and polylactic acid preferably combine.

Optionally, coupling agent is 0.5~3wt% of the plant fiber of micro-nano；Optionally, coupling agent is the plant of micro-nano 1~2wt% of fibres.

In the above-mentioned technical solutions, the coupling agent of aforementioned proportion is added, can preferably by the plant fiber of micro-nano and Polylactic acid combines.

In a kind of possible embodiment, composition further includes plasticizer.

In the above-mentioned technical solutions, when the plant fiber in composite material containing micro-nano, the addition meeting of plant fiber So that the melt flow rate (MFR) of composite material declines, material flows out incoherent problem when easily appearing in 3D printing, passes through addition Plasticizer can be improved the mobility of composite material.

Optionally, the total weight of the plant fiber of micro-nano and polylactic acid is A, and the weight of plasticizer is B, wherein B:A= 2.5%~15%.

In the above-mentioned technical solutions, the plasticizer of aforementioned proportion is added, can preferably improve the mobility of composite material.

Optionally, plasticizer is selected from polyethylene glycol or ester plasticizer.

In the above-mentioned technical solutions, polyethylene glycol can increase the mobility of composite material.In addition, the plant of micro-nano is fine Dimension improves the water absorbing properties of composite material, is easy to cause the mechanical properties decrease of composite material in a humid environment, esters Plasticizer can reduce the water absorption rate of composite material, increase its moisture-proof ability while improving the mobility of composite material. Optionally, ester plasticizer is selected from any one of tributyl citrate and dioctyl terephthalate.

Second aspect, the embodiment of the present application provide a kind of composite material for 3D printing, and composite material is with the application reality The composition that example is applied for 3D printing is made of main component.

In the above-mentioned technical solutions, the plant fiber of micro-nano is distributed in polylactic acid, when by external force, nanometer The fiber of grade can hinder the dislocation motion of polylactic acid matrix, and micron-sized plant fiber may act as entity and skeleton, to external force Effectively transmitted, bear by matrix transmitting Lai payload, so as to improve the mechanical property of composite material.And micro-nano The hydrophily of the plant fiber of change can be improved the water absorbing properties of composite material, increases its degradation rate, improves its bio-compatible Property.

The third aspect, the embodiment of the present application provide a kind of preparation method of composite material for 3D printing, composite material It is made of the composition for 3D printing of the embodiment of the present application of main component, preparation method includes: will be containing micro-nano The dispersion liquid of plant fiber is mixed with polylactic acid, is dried after removing the solvent contained in dispersion liquid.

In the above-mentioned technical solutions, the plant fiber of micro-nano is easy to mix with polylactic acid relatively to divide equally, so that micro-nano Plant fiber is preferably distributed in polylactic acid.When by external force, nanoscale fiber can hinder polylactic acid matrix Dislocation motion, micron-sized plant fiber may act as entity and skeleton, effectively transmitted to external force, and receiving is transmitted by matrix The payload come, so as to improve the mechanical property of composite material.And the hydrophily of the plant fiber of micro-nano can mention The water absorbing properties of high composite material increase its degradation rate, improve its biocompatibility.

In a kind of possible embodiment, the dispersion liquid of the plant fiber containing micro-nano is mixed with the polylactic acid Before, the dispersion liquid of the plant fiber containing micro-nano and coupling agent are first mixed to get mixed liquor, mixed liquor and polylactic acid are existed It is mixed under conditions of 30~70 DEG C.

In the above-mentioned technical solutions, the plant fiber of micro-nano is scattered in dispersion liquid, and dispersion liquid is mixed with coupling agent, then Mixed liquor is mixed under conditions of 30~70 DEG C with polylactic acid so that the plant fiber of micro-nano under the action of coupling agent with Polylactic acid is combined together well, dries the composite wood that can be obtained for 3D printing after removing the solvent contained in dispersion liquid Material.Optionally, coupling agent includes silane coupling agent or titante coupling agent.Optionally, coupling agent is that the plant of micro-nano is fine 0.5~3wt% of dimension；Optionally, coupling agent is 1~2wt% of the plant fiber of micro-nano.

In a kind of possible embodiment, the preparation method of the dispersion liquid of the plant fiber containing micro-nano include: by Plant fibre slurry liquid is discongested in water, is then dehydrated, is sized mixing and mashing obtains the first slurries；It will be in the first slurries The mass concentration of plant fiber is adjusted to 0.8%~1.2%, and carries out ultra micron and crush to obtain the second slurries；It is set using acetone The water to swap out in the second slurries recycles methylene chloride to displace acetone.

In the above-mentioned technical solutions, it by carrying out discongesting available plant fiber in water to plant fibre slurry liquid, passes through The solution containing plant fiber can be obtained after being dehydrated, sizing mixing, and the cell wall of plant fiber is made to become loose after beating.It will The mass concentration of plant fiber in first slurries is adjusted to 0.8%~1.2%, avoids because of the too high blocking ultra micron of concentration of slurry Disintegrating apparatus, the first slurries make plant fiber micro-nano after ultra micron crushes.It is displaced in the second slurries using acetone Water recycles methylene chloride to displace acetone and to contain methylene chloride in dispersion liquid, and the plant fiber of micro-nano can be preferable Ground is scattered in methylene chloride, it is not easy to which wadding is poly-.When addition has coupling agent, coupling agent can be also dissolved in methylene chloride, so that The plant fiber and polylactic acid for obtaining micro-nano can be preferably combined together with methylene chloride.

In a kind of possible embodiment, polylactic acid is mixed with mixed liquor as a solution, and the solvent of solution is two Chloromethanes.

In the above-mentioned technical solutions, coupling agent can be dissolved in methylene chloride so that polylactic acid can preferably with micro-nano The plant fiber of change reacts.

In a kind of possible embodiment, the temperature of baking step is 50~90 DEG C.

In the above-mentioned technical solutions, it can preferably be dried under the conditions of 50~90 DEG C of temperature.

In a kind of possible embodiment, when mixed liquor is mixed under conditions of 30~70 DEG C with polylactic acid, also wrap Addition plasticizer is included to be mixed.

In the above-mentioned technical solutions, it can be improved the mobility of composite material by the way that plasticizer is added.

Optionally, the total weight of the plant fiber of micro-nano and polylactic acid is A, and the weight of plasticizer is B, wherein B:A= 2.5%~15%.

In the above-mentioned technical solutions, it can be improved the mobility of composite material by the way that the plasticizer of aforementioned proportion is added.

Optionally, plasticizer is selected from polyethylene glycol or ester plasticizer.

In the above-mentioned technical solutions, polyethylene glycol can increase the mobility of composite material.In addition, the plant of micro-nano is fine Dimension improves the water absorbing properties of composite material, is easy to cause the mechanical properties decrease of composite material in a humid environment, esters Plasticizer can reduce the water absorption rate of composite material, increase its moisture-proof ability while improving the mobility of composite material.

Detailed description of the invention

Technical solution in ord to more clearly illustrate embodiments of the present application, below will be to needed in the embodiment attached Figure is briefly described, it should be understood that the following drawings illustrates only some embodiments of the application, therefore is not construed as pair The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this A little attached drawings obtain other relevant attached drawings.

Fig. 1 is the composite material of 1~embodiment of the embodiment of the present application 5 and the mechanical experimental results figure of polylactic acid；

Fig. 2 is the SEM figure of the composite material of the embodiment of the present application 3；

Fig. 3 is the SEM figure of the polylactic acid of the embodiment of the present application 3；

Fig. 4 is the result figure of the composite material of the embodiment of the present application 1~5 and the water absorption rate of polylactic acid；

Fig. 5 is the TGA test chart of the plant fiber of the composite material of the embodiment of the present application 3, polylactic acid and micro-nano；

Fig. 6 is the DTG test chart of the plant fiber of the composite material of the embodiment of the present application 3, polylactic acid and micro-nano；

Fig. 7 is the mechanical experimental results figure of the composite material of 6~embodiment of the embodiment of the present application 11；

Fig. 8 is the mechanical experimental results figure of the composite material of 12~embodiment of the embodiment of the present application 17；

Fig. 9 is the mechanical experimental results figure of the composite material of 18~embodiment of the embodiment of the present application 23；

Figure 10 is the mechanical experimental results figure of the composite material of 24~embodiment of the embodiment of the present application 29；

Figure 11 is the survey of the water absorption rate of the composite material of the embodiment of the present application 3, embodiment 14, embodiment 19 and embodiment 24 Test result figure；

Figure 12 is mechanical experimental results of the composite material of the embodiment of the present application 14 before immersion and after immersion immersion Figure；

Figure 13 is mechanical experimental results of the composite material of the embodiment of the present application 19 before immersion and after immersion immersion Figure；

Figure 14 is mechanical experimental results of the composite material of the embodiment of the present application 24 before immersion and after immersion immersion Figure；

Figure 15 is the SEM figure for the plant fiber that the embodiment of the present application 1 prepares micro-nano；

Figure 16 is the mechanical experimental results figure of the composite material of 30~embodiment of the embodiment of the present application 34.

Specific embodiment

It is described in detail below in conjunction with embodiment of the embodiment to the application, but those skilled in the art will Understand, the following example is merely to illustrate the application, and is not construed as limitation scope of the present application.It is not specified in embodiment specific Condition person carries out according to conventional conditions or manufacturer's recommended conditions.Reagents or instruments used without specified manufacturer is The conventional products that can be obtained by commercially available purchase.

A kind of below for the embodiment of the present application carries out for the composition of 3D printing, composite material and preparation method It illustrates:

The embodiment of the present application provides a kind of composition for 3D printing, and composition includes the plant fiber of micro-nano and gathers Lactic acid.Wherein, plant fiber can be lumber fibre, be also possible to non-wood-fiber；Such as lumber fibre can be poplar fibre Dimension, is also possible to other plant fibers；Such as non-wood-fiber can be reclaimed waste paper fiber.The embodiment of the present application is to plant The type of fiber does not limit specifically.

In a kind of possible embodiment, the plant fiber of micro-nano and the weight ratio of polylactic acid are (1~4): (6~ 9).Illustratively, the weight ratio of the plant fiber of micro-nano and polylactic acid is 1:9,2:8,3:7 or 4:6.A kind of possible In embodiment, the weight ratio of the plant fiber of micro-nano and the polylactic acid is (2~3): (7~8).

It should be noted that the plant fiber of micro-nano is referred to containing micron order and nanoscale plant fiber, micro-nano The plant fiber of change not necessarily all micron orders and nanoscale.When in the plant fiber of micro-nano contain micron order and nanometer When the plant fiber of grade is more, the mechanical property for improving composite material can be better played.

It illustratively, include length is 300~800 μm, width is 25~40 μm micron in the plant fiber of micro-nano Grade plant fiber and the nano level plant fiber that length is 100~900nm, width is 30~40nm.

In a kind of possible embodiment, the length of micron order plant fiber is 300 μm, 350 μm, 400 μm, 450 μm, Any one of 500 μm, 550 μm, 600 μm, 650 μm, 700 μm, 750 μm and 800 μm or appoint range between the two；Micron The width of grade plant fiber is in 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, 30 μm, 32 μm, 34 μm, 36 μm, 38 μm and 40 μm Any one appoints range between the two.

Optionally, the plant fiber of micro-nano is by poplar alkaline hydrogen peroxide chemical mechanical pulp (Aspen APMP paper pulp) through micro- Receiving handles to obtain.

In a kind of possible embodiment, the length of nano level plant fiber is 100nm, 200nm, 300nm, 400nm, Any one of 500nm, 600nm, 700nm, 800nm and 900nm appoint range between the two；Nano level plant fiber Width is any one of 30nm, 32nm, 34nm, 36nm, 38nm and 40nm or appoints range between the two.

In a kind of possible embodiment, composition further includes coupling agent.Optionally, coupling agent is the plant of micro-nano 0.5~3wt% of fiber.

Illustratively, coupling agent be 0.5wt%, 0.8wt% of plant fiber of micro-nano, 1.0wt%, 1.2wt%, Any one of 1.5wt%, 2wt%, 2.5wt% and 3wt% appoint range between the two.In a kind of possible embodiment party In case, coupling agent is 1~2wt% of the plant fiber of micro-nano

In a kind of possible embodiment, coupling agent includes silane coupling agent or titante coupling agent.Illustratively, Silane coupling agent is KH-550, KH-560 or KH-570.Illustratively, titante coupling agent is titanate coupling agent CT- 928, titanate coupling agent NDZ-201 or titanate coupling agent KR-38S.

Further, composition further includes plasticizer, and the plant fiber of micro-nano and the total weight of polylactic acid are A, plasticising The weight of agent is B, wherein B:A=2.5%~15%.

Illustratively, B:A=2.5%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, Any one of 14% and 15% or any range between the two.

Wherein, plasticizer is selected from polyethylene glycol (English abbreviation PEG, full name in English are Polyethylene glycol) Or ester plasticizer.Optionally, selected from tributyl citrate, (English abbreviation TBC, full name in English are ester plasticizer Tributyl citrate) and dioctyl terephthalate (English abbreviation DOTP, full name in English Dioctyl Any one of terephthalate).

The embodiment of the present application also provides a kind of composite material for 3D printing, and composite material is with the combination for 3D printing Object is made of main component.

The embodiment of the present application also provides a kind of preparation method of composite material for 3D printing, and composite material is by being used for 3D The composition of printing is made of main component, and preparation method includes: by the dispersion liquid of the plant fiber containing micro-nano and poly- cream Acid-mixed is closed, and is dried after removing the solvent contained in dispersion liquid.

Further, in a kind of possible embodiment, by the dispersion liquid of the plant fiber containing micro-nano and poly- cream Before acid-mixed is closed, the dispersion liquid of the plant fiber containing micro-nano and coupling agent are first mixed to get mixed liquor, by mixed liquor and gathered Lactic acid mixes under conditions of 30~70 DEG C.

Illustratively, mixed liquor and polylactic acid are in 30 DEG C, 32 DEG C, 35 DEG C, 38 DEG C, 40 DEG C, 43 DEG C, 45 DEG C, 46 DEG C, 47 DEG C, 48 DEG C, 49 DEG C, 50 DEG C, 51 DEG C, 52 DEG C, 53 DEG C, 54 DEG C, 55 DEG C, 58 DEG C, 60 DEG C, 63 DEG C, 65 DEG C, 68 DEG C, 70 DEG C or 75 It is mixed under conditions of DEG C.

In a kind of possible embodiment, the temperature of baking step is 50~90 DEG C.Illustratively, the temperature of baking step Degree is in 50 DEG C, 52 DEG C, 55 DEG C, 58 DEG C, 60 DEG C, 62 DEG C, 65 DEG C, 68 DEG C, 70 DEG C, 72 DEG C, 75 DEG C, 80 DEG C, 85 DEG C and 90 DEG C Any one or any range between the two.

Wherein, the description before the selection of coupling agent and dosage can be found in, details are not described herein.

Further, the preparation method of the dispersion liquid of the plant fiber containing micro-nano includes: that plant fibre slurry liquid exists It is discongested in water, is then dehydrated, is sized mixing and mashing obtains the first slurries；By the quality of the plant fiber in the first slurries Concentration is adjusted to 0.8%~1.2%, and carries out ultra micron and crush to obtain the second slurries；It is displaced in the second slurries using acetone Water, recycle methylene chloride displace acetone.

Illustratively, the mass concentration of the plant fiber in the first slurries is adjusted to 0.8%, 0.9%, 1.0%, 1.1% or 1.2%.

Wherein, the mass concentration of the plant fiber of the micro-nano in the second slurries can measure by the following method: take quality For M₁The drying of the second slurries, then available M₂Micro-nano plant fiber, then the plant of the micro-nano in the second slurries is fine The concentration of dimension is M₂/M₁。

In a kind of possible embodiment, polylactic acid is mixed with mixed liquor as a solution, and the solvent of solution is two Chloromethanes.

It is understood that polylactic acid can also directly be mixed with mixed liquor when containing methylene chloride in dispersion liquid.

Further, when mixed liquor being mixed under conditions of 30~70 DEG C with polylactic acid, further include be added plasticizer into Row mixing, the plant fiber of micro-nano and the total weight of polylactic acid are A, and the weight of plasticizer is B, wherein B:A=2.5%~ 15%.

Illustratively, B:A=2.5%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, Any one of 14% and 15% or any range between the two.

It should be noted that the selection of plasticizer and dosage can be found in front of description, details are not described herein.

The a kind of of the application is made for the composition of 3D printing, composite material and preparation method with reference to embodiments It is described in further detail.