A biomass photosensitive material, its preparation method and application

Abstract

The present invention provides a biomass photosensitive material, a preparation method and an application thereof. The biomass photosensitive material comprises 30-50 parts of eucommia gum modified polyester, 45-75 parts of cardanol modified reactive diluent and 1-5 parts of photoinitiator by weight. The biomass photosensitive material provided by the present invention has the advantages of low shrinkage rate, high forming precision and good mechanical properties. At the same time, it can achieve rapid curing, has a self-healing function, and the main raw materials are derived from natural organisms, reducing the use of petroleum-based raw materials, and the product is more green and environmentally friendly.

Description

Technical Field

[0001] The present invention belongs to the technical field of 3D printing, and particularly relates to a biomass photosensitive material, a preparation method and an application thereof, and more particularly to a biomass photosensitive material with low shrinkage rate and high forming precision, a preparation method and an application thereof. Background Art

[0002] 3D printing belongs to additive manufacturing, and is an advanced manufacturing technology for manufacturing complex solid parts by layer-by-layer printing and stacking of materials. After years of development, 3D printing has been applied in the fields of aerospace, medical treatment, science and education, automobiles, etc. According to different application scenarios and equipment used, it can be divided into desktop 3D printing and industrial 3D printing.

[0003] Industrial 3D printing is mainly applied in some large national economic sectors such as aerospace and medical treatment, while desktop 3D printing is mainly applied in industries closely related to daily life such as science and education and makers. At present, most desktop 3D printing on the market adopts FDM and stereolithography technologies. FDM is thermal stacking, and a model is printed layer by layer with a nozzle by heating consumables; stereolithography 3D printing uses light to cure photosensitive materials to form the desired model. Stereolithography has much higher precision than ordinary FDM printing products, and the finished product of stereolithography has no obvious layer lines and is much smoother on the surface. Stereolithography is currently the most mature 3D printing technology. However, at present, whether it is FDM or stereolithography, desktop 3D printing can only be used to print smaller items, and is mostly used for prototype printing such as figurines and dolls. There is little desktop 3D printing that can directly print functional products with mechanical properties, which is mainly limited by printing technology and materials.

[0004] Photosensitive materials are the raw materials for stereolithography printing, and their properties directly affect the quality, mechanical properties and precision of the formed parts; usually, photosensitive materials for 3D printing need to have the following properties: low viscosity, high photosensitivity, small curing shrinkage, storage stability, and good properties after curing, etc. At present, most stereolithography materials use petroleum-based resins with higher hardness such as epoxy resins and acrylate resins. Most of them have mechanical defects such as insufficient toughness, poor impact resistance and tear resistance, and the accuracy decline caused by solid shrinkage limits the popularization of desktop 3D printing.

[0005] CN105175645A introduces a macromonomer synthesized from isoprene and ethylene oxide into the acrylic resin system, and the stress generated during shrinkage is released by the elastomer. After photocuring, the tensile strength and elongation at break of the product are greatly improved, and the brittleness of the material is improved. However, the application of phenyl lithium causes great harm to the environment and does not conform to the development trend of 3D printing in terms of environmental protection.

[0006] In the photosensitive material of acrylic resin, HDPE is introduced. By virtue of the toughness and high temperature resistance of the polymer, the mechanical properties and aging resistance of the photosensitive material after curing are improved. Finally, the elastic modulus, tensile strength, high temperature resistance, etc. of the cured product are all enhanced. However, the linear shrinkage of HDPE during curing is likely to cause a decrease in the accuracy of the product.

[0007] To solve the problems existing in the above-mentioned photosensitive materials applied in 3D printing, the purpose of the present invention is to provide a photosensitive material suitable for 3D printing and its preparation method. Summary of the Invention

[0008] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a biomass photosensitive material, its preparation method and application, in particular to provide a biomass photosensitive material with low shrinkage rate and high forming accuracy, its preparation method and application. The biomass photosensitive material provided by the present invention has the advantages of low shrinkage rate, high forming accuracy, good mechanical properties, and can achieve rapid curing, has a self-healing function, and the main raw materials are derived from natural organisms, reducing the use of petroleum-based raw materials, and the product is more environmentally friendly.

[0009] To achieve the purpose of this invention, the following technical solutions are adopted by the present invention:

[0010] In the first aspect, the present invention provides a biomass photosensitive material, and the biomass photosensitive material includes 30-50 parts of eucommia gum modified polyester, 45-75 parts of cardanol modified reactive diluent and 1-5 parts of photoinitiator by weight.

[0011] Among them, the number of parts of eucommia gum modified polyester can be 30 parts, 32 parts, 34 parts, 36 parts, 38 parts, 40 parts, 42 parts, 44 parts, 46 parts, 48 parts or 50 parts, etc., the number of parts of cardanol modified reactive diluent can be 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts or 75 parts, etc., and the number of parts of photoinitiator can be 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts, etc., but not limited to the values listed above, and other unlisted values within the above numerical range are equally applicable.

[0012] The above-mentioned biomass photosensitive material adopts a specific compounding of eucommia gum modified polyester and cardanol modified reactive diluent, and through their synergistic effect, significantly shortens the curing time, realizes rapid curing, reduces the shrinkage rate during curing, and improves the forming accuracy; has excellent mechanical properties and heat resistance, and can achieve rapid self-healing; the main raw materials are derived from natural organisms, reducing the use of petroleum-based raw materials, and the product is more environmentally friendly.

[0013] Preferably, the biomass photosensitive material comprises 35-45 parts by weight of eucommia gum modified polyester, 55-65 parts by weight of cardanol modified reactive diluent, and 2-4 parts by weight of photoinitiator.

[0014] Preferably, the eucommia gum modified polyester is prepared by a method comprising the following steps:

[0015] Mix eucommia gum, a partial unsaturated dibasic acid and / or its anhydride for reaction, and then mix with a diol, the remaining unsaturated dibasic acid and / or its anhydride for reaction to obtain the eucommia gum modified polyester.

[0016] The eucommia gum modified polyester obtained by the above specific preparation method can endow the product with self-healing ability, and at the same time, when compounded with the cardanol modified reactive diluent, it can effectively shorten the curing time, reduce the shrinkage rate during curing, and improve the molding accuracy.

[0017] Preferably, the mixing reaction further includes mixing with an initiator.

[0018] Preferably, the initiator includes dicumyl peroxide.

[0019] Preferably, the unsaturated dibasic acid includes any one or at least two combinations of maleic acid, itaconic acid, pentenedioic acid, citraconic acid or trans, trans - hexadienedioic acid, such as the combination of maleic acid and itaconic acid, the combination of itaconic acid and pentenedioic acid, or the combination of pentenedioic acid and citraconic acid, etc., but is not limited to the combinations listed above, and other unlisted combinations within the above combination range are equally applicable.

[0020] Preferably, the diol includes any one or at least two combinations of pentanediol, 2 - methyl - 2 - propyl - 1,3 - propanediol, 2 - methyl - 1,3 - propanediol, 1,2 - propanediol, 1,2 - butanediol, 1,3 - butanediol, 2,3 - butanediol, 1,2 - octanediol, 1,2 - pentanediol, 1,2 - hexanediol, 3 - methyl - 1,3 - butanediol, 3 - methyl - 1,5 - pentanediol, 2 - methyl - 2,4 - pentanediol, 2,4 - diethyl - 1,5 - pentanediol, 2,2,4 - trimethyl - 1,3 - pentanediol, 2 - butyl - 2 - ethyl - 1,3 - propanediol, 2 - ethyl - 1,3 - hexanediol, 2,5 - dimethyl - 2,5 - hexanediol, 2 - methyl - 1,8 - octanediol, 2,2,7,7 - tetramethyl - 1,8 - octanediol, 2 - ethyl - 2 - isobutyl - 1,3 - propanediol, 2,4,4 - trimethyl - 1,6 - hexanediol, 2 - heptyl - 1,3 - propanediol, 2 - octyl - 1,3 - propanediol or 2 - hexyl - 1,4 - butanediol.

[0021] Preferably, the cardanol modified reactive diluent is prepared by a method comprising the following steps:

[0022] The cardanol and / or hydroxy cardanol are mixed and reacted with an unsaturated dibasic acid, and then capped to obtain the cardanol-modified reactive diluent.

[0023] Preferably, the unsaturated dibasic acid includes any one or a combination of at least two of maleic acid, itaconic acid, glutaconic acid, citraconic acid or trans, trans - hexadienoic acid, such as a combination of maleic acid and itaconic acid, a combination of itaconic acid and glutaconic acid, or a combination of glutaconic acid and citraconic acid, etc., but is not limited to the combinations listed above, and other unlisted combinations within the above combination range are equally applicable.

[0024] The cardanol-modified reactive diluent prepared by the above specific method can be compounded with the gutta-percha-modified polyester to effectively shorten the curing time, reduce the shrinkage rate during curing, improve the forming accuracy, and can effectively improve the mechanical properties and heat resistance of the product.

[0025] Preferably, the capping agent for capping includes any one or a combination of at least two of methacrylamide, N - methylallylamine, diallylamine, 2 - methylallylamine, allylamine, cyclohexanol, ethanol, butanol, phenol, and methacrylamide is preferred.

[0026] The above preferably capped cardanol-modified reactive diluent can act together with the gutta-percha-modified polyester to significantly shorten the self-healing time.

[0027] Preferably, the photoinitiator includes any one or a combination of at least two of TPO, photoinitiator 1173, photoinitiator 184, photoinitiator 651 or photoinitiator 819.

[0028] Preferably, the biomass photosensitive material further includes 20 - 30 parts by weight of a color filler.

[0029] Preferably, the biomass photosensitive material further includes 0.1 - 0.5 parts by weight of an auxiliary agent.

[0030] Among them, the number of parts of the color filler can be 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts or 30 parts, etc., and the number of parts of the auxiliary agent can be 0.1 part, 0.2 part, 0.3 part, 0.4 part or 0.5 part, etc., but is not limited to the values listed above, and other unlisted values within the above value range are equally applicable.

[0031] Preferably, the auxiliary agent includes a leveling agent and / or an antifoaming agent.

[0032] In a second aspect, the present invention provides a preparation method of the biomass photosensitive material as described above, and the preparation method includes the following steps:

[0033] Mix eucommia gum modified polyester and cardanol modified reactive diluent, and then mix and stir with a photoinitiator to obtain the biomass photosensitive material.

[0034] Preferably, the mixing with the photoinitiator further includes mixing with a color filler and an auxiliary agent.

[0035] In the third aspect, the present invention also provides an application of the biomass photosensitive material as described above in the preparation of 3D printing raw materials.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] The present invention provides a biomass photosensitive material. By using a specific compound of eucommia gum modified polyester and cardanol modified reactive diluent, through their synergistic effect, the curing time is significantly shortened, rapid curing is achieved, the shrinkage rate during curing is reduced, and the forming accuracy is improved; it has excellent mechanical properties and heat resistance, and can achieve rapid self-healing; the main raw materials are derived from natural organisms, reducing the use of petroleum-based raw materials, and the product is more green and environmentally friendly. Specific Embodiments

[0038] To further elaborate on the technical means and effects adopted by the present invention, the following further illustrates the technical solutions of the present invention in combination with the preferred embodiments of the present invention, but the present invention is not limited to the scope of the embodiments.

[0039] In the following examples, all parts are in terms of weight parts.

[0040] Preparation Example 1

[0041] This preparation example provides a eucommia gum modified polyester, and the specific preparation process is as follows:

[0042] Dissolve 100 parts of eucommia gum (EUR), 14 parts of maleic acid (MA), and 5 parts of diisopropylbenzene peroxide in 300 parts of 1,2-dichlorobenzene solution, fill with nitrogen, control the reaction temperature at 190 °C and react for 1 h, then add the above solution to an acetone solution for vacuum drying to obtain 84 parts of EUR-MA;

[0043] Dissolve 115 parts of 3-methyl-1,5-pentanediol, 65 parts of itaconic acid, and 84 parts of EUR-MA in a tetrahydrofuran solution, then add the catalyst antimony trioxide (the concentration reaches 100 ppm of the total reactants), raise the temperature to 180 °C, and slowly reduce the pressure to below 100 Pa, and react for 20 h; finally, eliminate the vacuum to obtain the eucommia gum modified polyester.

[0044] Preparation Example 2

[0045] This preparation example provides a modified polyester of eucommia gum. The specific preparation process is the same as that of Preparation Example 1, except that 3-methyl-1,5-pentanediol is replaced with an equimolar amount of 2,2,7,7-tetramethyl-1,8-octanediol.

[0046] Preparation Example 3

[0047] This preparation example provides a cardanol-modified reactive diluent. The specific preparation process is as follows:

[0048] 165 parts of hydroxy cardanol and 116 parts of maleic acid were added dropwise to a reaction vessel containing 200 parts of toluene. Then, 0.04 parts (the concentration reached 100 ppm of the total reactants) of the catalyst niobium pentoxide was added. The temperature was raised to 100 °C, and the pressure was slowly reduced to below 100 Pa, and the reaction was carried out for 20 h. Finally, the unreacted maleic acid was removed, the vacuum was eliminated, and after cooling to 20 °C, 93.5 parts of methacrylamide was added, and the temperature was further raised to 100 °C, and the reaction was refluxed and maintained for 24 h to obtain the cardanol-modified reactive diluent.

[0049] Preparation Example 4

[0050] This preparation example provides a cardanol-modified reactive diluent. The specific preparation process is the same as that of Preparation Example 3, except that it is not capped with methacrylamide and is capped with an equimolar amount of phenol.

[0051] Preparation Example 5

[0052] This preparation example provides a cardanol-modified reactive diluent. The specific preparation process is the same as that of Preparation Example 3, except that it is not capped with methacrylamide and is capped with an equimolar amount of cyclohexanol.

[0053] Example 1

[0054] This example provides a biomass photosensitive material, and the composition is as follows:

[0055] 40 parts of the modified polyester of eucommia gum provided by Preparation Example 1, 60 parts of the cardanol-modified reactive diluent provided by Preparation Example 3, 3 parts of photoinitiator 184 (from Kayin Chemical Industry), 0.1 part of leveling agent BYK333 (from Kunshan Daiquan), 0.1 part of defoaming agent BYK037 (from Kunshan Daiquan), and 25 parts of titanium dioxide.

[0056] The preparation method is as follows:

[0057] The modified polyester of eucommia gum, the cardanol-modified reactive diluent, the photoinitiator, the leveling agent, and the defoaming agent were mixed and dispersed at a rotation speed of 100 rpm for 1 h. Then the rotation speed was increased to 1500 rpm, and titanium dioxide was added in batches. The rotation speed was increased to 2500 rpm and dispersed for 2 h to obtain the biomass photosensitive material.

[0058] Example 2

[0059] This embodiment provides a biomass photosensitive material, which is composed of the following:

[0060] 35 parts of eucommia gum modified polyester provided by Preparation Example 2, 55 parts of cashew phenol modified active diluent provided by Preparation Example 3, 2 parts of photoinitiator 184, 0.05 part of leveling agent BYK333, 0.05 part of defoaming agent BYK037, and 20 parts of titanium dioxide.

[0061] The preparation method refers to Example 1.

[0062] Example 3

[0063] This embodiment provides a biomass photosensitive material, which is composed of the following:

[0064] 45 parts of eucommia gum modified polyester provided by Preparation Example 2, 65 parts of cashew phenol modified active diluent provided by Preparation Example 3, 4 parts of photoinitiator 184, 0.25 part of leveling agent BYK333, 0.25 part of defoaming agent BYK037, and 30 parts of titanium dioxide.

[0065] The preparation method refers to Example 1.

[0066] Example 4

[0067] This embodiment provides a biomass photosensitive material, which is composed of the following:

[0068] 30 parts of eucommia gum modified polyester provided by Preparation Example 2, 45 parts of cashew phenol modified active diluent provided by Preparation Example 3, 1 part of photoinitiator 184, 0.05 part of leveling agent BYK333, 0.05 part of defoaming agent BYK037, and 20 parts of titanium dioxide.

[0069] The preparation method refers to Example 1.

[0070] Example 5

[0071] This embodiment provides a biomass photosensitive material, which is composed of the following:

[0072] 50 parts of eucommia gum modified polyester provided by Preparation Example 2, 75 parts of cashew phenol modified active diluent provided by Preparation Example 3, 5 parts of photoinitiator 184, 0.25 part of leveling agent BYK333, 0.25 part of defoaming agent BYK037, and 30 parts of titanium dioxide.

[0073] The preparation method refers to Example 1.

[0074] Example 6

[0075] This embodiment provides a biomass photosensitive material. Except that the cardanol-modified reactive diluent provided in Preparation Example 3 is replaced with an equal amount of the cardanol-modified reactive diluent provided in Preparation Example 4, the rest is the same as in Example 1.

[0076] The preparation method refers to Example 1.

[0077] Example 7

[0078] This embodiment provides a biomass photosensitive material. Except that the cardanol-modified reactive diluent provided in Preparation Example 3 is replaced with an equal amount of the cardanol-modified reactive diluent provided in Preparation Example 5, the rest is the same as in Example 1.

[0079] The preparation method refers to Example 1.

[0080] Comparative Example 1

[0081] This comparative example provides a biomass photosensitive material. Except that the amount of eucommia gum-modified polyester is 20 parts, and part of it is reduced and allocated to the cardanol-modified reactive diluent, the rest is the same as in Example 1.

[0082] Comparative Example 2

[0083] This comparative example provides a biomass photosensitive material. Except that the amount of cardanol-modified reactive diluent is 20 parts, and part of it is reduced and allocated to the eucommia gum-modified polyester, the rest is the same as in Example 1.

[0084] Comparative Example 3

[0085] This comparative example provides a biomass photosensitive material. Except that the eucommia gum-modified polyester is replaced with an equal amount of Bluecol L-6211 (from Guangdong Bluecol New Materials Co., Ltd.), the rest is the same as in Example 1.

[0086] Comparative Example 4

[0087] This comparative example provides a biomass photosensitive material. Except that the cardanol-modified reactive diluent is replaced with an equal amount of HDDA (from Cyanchem), the rest is the same as in Example 1.

[0088] Effect test:

[0089] The biomass photosensitive materials provided in Examples 1-7 and Comparative Examples 1-4 were tested. The test items and methods are as follows:

[0090] Determination of curing time: The test method refers to GB / T 1728-1979 (1989) "Determination Method for Drying Time of Paint Film and Putty Film". The photosensitive material was coated on a glass slide, and the coating amount was controlled at 50 ± 1 gsm. Then it was sent into the ultraviolet working area for curing, and the lowest light irradiation time when there was no coating sticking to the hand was recorded as the curing time.

[0091] Shrinkage rate test: JIS K 6941-2019 "Continuous measurement method for shrinkage rate of UV-curable resins and thermosetting resins", 100 mW / cm 2 Cure for 40 s and test the change in shrinkage rate;

[0092] Printing precision dimensions: DB35 / T 1933-2020 Specification for geometric precision evaluation of fused deposition 3D printed products;

[0093] Heat distortion temperature; GB / T 1699-2003 Determination of Martens heat resistance temperature of hard rubber;

[0094] Self-healing time test: Use a utility knife to make a scratch with a depth of 2 mm on the surface of the photocured material. Place the side of the object on a heat sealer. The pressure of the upper and lower knives of the heat sealer makes the two sides of the scratch contact. Set the pressure to 0.3 MPa and the heat sealing temperature to 50 °C, and record the time when the scratch disappears.

[0095] The physical properties of the photosensitive material are the properties of the photocured product. The product is prepared according to the following process:

[0096] Using the 3D additive printing method, use a 3D printer with an LED UV light source to print 3D three-dimensional patterns on a glass slide with the biomass photosensitive materials provided in Examples 1-7 and Comparative Examples 1-4. In the 3D printing, the LED UV light source is turned on, the wavelength is set to 405 nm, the nozzle temperature is set to 60 °C, the printing speed is set to 30 mm / s, and the printing table temperature is set to 40 °C. The nozzle uses a No. 17 needle with a diameter of 1.0 mm, and the filling angle is set to be perpendicular to the surface of the glass slide. Print a cuboid with a length, width and height of 15 cm × 5 cm × 1 cm respectively.

[0097] The results are as follows:

[0098] Group Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Curing time / s 2.5 2.5 2.1 2.7 3.0 3.0 Shrinkage rate / % 3.5 3.8 4.0 4.2 4.3 3.9 Precision dimension / μm 170 175 180 183 187 177 Heat distortion temperature / °C 75 78 86 70 71 72 Self-healing time / h 10 11 11 12 12 19

[0099] Group Example 7 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Curing time / s 3.5 4.0 5.0 6.0 5.0 Shrinkage rate / % 4.1 6 7.8 7 7.5 Precision dimension / μm 182 210 300 270 285 Heat distortion temperature / °C 69 52 70 62 71 Self-healing time / h 21 28 13 >48 30

[0100] The above data fully demonstrate that the biomass photosensitive material provided by the present invention has the advantages of short curing time, low shrinkage rate, excellent precision, good heat resistance, and short self-healing time. By comparing Examples 1-5 with Comparative Examples 1-2, it can be found that by controlling the ratio between each component and strictly controlling the ratio between gutta-percha modified polyester and cardanol modified active diluent, the curing time and shrinkage rate of the product are further shortened, the precision is improved, the heat resistance is enhanced, and the self-healing time is shortened. By comparing Example 1 with Examples 6-7, it can be found that by selecting a specific end-capping agent and compounding it with gutta-percha modified polyester, the self-healing time is effectively shortened. By comparing Example 1 with Comparative Examples 3-4, it can be found that by compounding gutta-percha modified polyester and cardanol modified active diluent and through their synergistic effect, the curing time and shrinkage rate of the product are significantly shortened compared with other existing raw materials, the precision and heat resistance are improved, and the self-healing time is shortened.

[0101] The applicant declares that the present invention uses the above examples to illustrate the biomass photosensitive material, its preparation method and application of the present invention, but the present invention is not limited to the above examples, that is, it does not mean that the present invention must rely on the above examples to be implemented. Those skilled in the art should understand that any improvement to the present invention, the equivalent substitution of each raw material of the product of the present invention, the addition of auxiliary components, and the selection of specific methods, etc., all fall within the protection scope and the disclosure scope of the present invention.

[0102] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0103] In addition, it should be noted that in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

Claims

1. A biomass photosensitive material, characterized in that, The biomass photosensitive material comprises 30-50 parts by weight of eucommia gum modified polyester, 45-75 parts by weight of cardanol modified reactive diluent and 1-5 parts by weight of photoinitiator; The eucommia gum modified polyester is prepared by a method comprising the following steps: Mix eucommia gum, partial unsaturated dibasic acid and / or its anhydride for reaction, and then mix with diol, remaining unsaturated dibasic acid and / or its anhydride for reaction to obtain the eucommia gum modified polyester; The cardanol modified reactive diluent is prepared by a method comprising the following steps: Mix cardanol and / or hydroxy cardanol, unsaturated dibasic acid for reaction, and then carry out end-capping to obtain the cardanol modified reactive diluent; In the preparation method of the eucommia gum modified polyester or the preparation method of the cardanol modified reactive diluent, the unsaturated dibasic acid independently includes any one or a combination of at least two of maleic acid, itaconic acid, citraconic acid or trans, trans - hexadiene diacid.

2. The biomass photosensitive material according to claim 1, characterized in that, The biomass photosensitive material comprises 35-45 parts by weight of eucommia gum modified polyester, 55-65 parts by weight of cardanol modified reactive diluent and 2-4 parts by weight of photoinitiator.

3. The biomass photosensitive material according to claim 1, wherein The end-capping agent for end-capping includes any one or a combination of at least two of methacrylamide, N-methylallylamine, diallylamine, 2-methylallylamine, allylamine, cyclohexanol, ethanol, butanol, phenol.

4. The biomass photosensitive material according to claim 3, characterized in that, The end-capping agent for end-capping is methacrylamide.

5. The biomass photosensitive material according to any one of claims 1-4, characterized in that, The biomass photosensitive material further comprises 20-30 parts by weight of color filler.

6. The biomass photosensitive material according to any one of claims 1-4, characterized in that, The biomass photosensitive material further comprises 0.1-0.5 parts by weight of additive.

7. The biomass photosensitive material according to claim 6, characterized in that, The additive includes a leveling agent and / or an antifoaming agent.

8. A method for preparing the biomass photosensitive material according to any one of claims 1-4, characterized in that, The preparation method includes the following steps: Mix the eucommia gum modified polyester and the cardanol modified reactive diluent, and then mix and stir with the photoinitiator to obtain the biomass photosensitive material.

9. The preparation method according to claim 8, characterized in that, The mixing with the photoinitiator further includes mixing with the color filler and the additive.

10. Use of the biomass photosensitive material according to any one of claims 1-7 in the preparation of 3D printing raw materials.