3D printing support material based on MJP technology and preparation method thereof

Abstract

The invention provides a 3D printing support material based on an MJP technology and a preparation method thereof, and relates to the technical field of 3D printing, the support material comprises the following components by mass: 55-70 parts of higher aliphatic alcohol, 1-5 parts of a plasticizer, 25-45 parts of tackifying resin, and 0.1-2 parts of an auxiliary agent; the higher fatty alcohol comprises at least one of cetanol, octadecanol, docosanol, hexacosanol and octacosanol; the tackifying resin comprises high hydroxyl resin; and the hydroxyl value of the high hydroxyl resin is 30-130 mgKOH / g. The technical problems that an existing supporting material is low in cleaning speed, and the delivery speed of customers is affected are solved, and the technical effects that the dissolving speed of the supporting material in an alcohol cleaning solution is increased, the cleaning and removing speed of the supporting material in the 3D printing model is greatly increased, the delivery speed of the customers is increased, and the manufacturing cost is reduced are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of 3D printing, and in particular to a 3D printing support material based on MJP technology and a preparation method thereof. Background Art

[0002] 3D printing, also known as additive manufacturing, is a technology that uses digital model files (usually STL or CAD files) to construct objects layer by layer using materials such as plastic, wax, ceramic, and metal. Compared to traditional technologies, 3D printing offers advantages such as time savings, rapid customization, the ability to design highly complex structures, the elimination of molds, and the ability to conduct repeated testing. 3D printing has been widely used in high-precision casting applications such as jewelry processing, dental prosthesis processing, and aerospace.

[0003] At present, 3D printing technologies include stereolithography (SLA), selective laser sintering (SLS), digital light processing (DLP), and multi-jet printing (MJP). Among them, printers using MJP and DLP technologies have already occupied a certain market share in the high-precision casting industry. MJP 3D printing technology using wax materials has been favored by the market due to its higher precision and more reliable casting performance.

[0004] MJP 3D printing technology typically requires support materials for overhanging areas of parts. After printing, the support materials are removed using cleaning fluids such as alcohol and water to obtain the desired model. However, existing support materials have many problems, such as slow cleaning speed, which seriously affects customer delivery speed and increases shipping costs.

[0005] In view of this, the present invention is proposed. Summary of the Invention

[0006] One of the purposes of the present invention is to provide a 3D printing support material based on MJP technology, which solves the technical problem of slow cleaning speed of existing support materials.

[0007] The second object of the present invention is to provide a method for preparing 3D printing support materials based on MJP technology, which has a simple process, high efficiency, high success rate, and is suitable for factory production.

[0008] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are adopted:

[0009] In a first aspect, a 3D printing support material based on MJP technology comprises the following components in parts by mass:

[0010] 55-70 parts of higher fatty alcohol, 1-5 parts of plasticizer, 25-45 parts of tackifying resin, and 0.1-2 parts of auxiliary agent;

[0011] The higher fatty alcohol includes at least one of cetyl alcohol, stearyl alcohol, behenyl alcohol, hexacosanol and octacosanol;

[0012] The tackifying resin includes a high hydroxyl resin;

[0013] The high hydroxyl resin has a hydroxyl value of 30-130 mgKOH / g.

[0014] Furthermore, the higher fatty alcohol includes the following components in parts by mass:

[0015] 50-60 parts of stearyl alcohol, 1-8 parts of docosanol, 1-5 parts of hexacosanol, and 1-2 parts of octacosanol.

[0016] Furthermore, the plasticizer includes at least one of dicyclohexyl phthalate, glyceryl tribenzoate, dioctyl phthalate, dibutyl phthalate and diisobutyl phthalate;

[0017] Preferably, the plasticizer is at least one of dioctyl phthalate and glyceryl tribenzoate.

[0018] Furthermore, the tackifying resin is a rosin resin and a high hydroxyl resin;

[0019] Preferably, the softening point of the rosin resin is 70-110°C;

[0020] Preferably, the rosin resin includes at least one of hydrogenated rosin glycerol ester, hydrogenated rosin resin and modified rosin resin;

[0021] Preferably, the rosin-based resin is at least one of hydrogenated rosin glycerol ester and hydrogenated rosin resin.

[0022] Furthermore, the high hydroxy resin includes at least one of aldehyde-ketone resin, polyaldehyde resin, rosin alcohol and hydroxy acrylic resin;

[0023] Preferably, the high hydroxyl resin is at least one of aldehyde-ketone resin and rosin alcohol.

[0024] Furthermore, the auxiliary agent includes at least one of an antioxidant, a leveling agent and a dispersant;

[0025] Preferably, the auxiliary agent is an antioxidant.

[0026] In a second aspect, a method for preparing the support material according to any one of the above items comprises the following steps:

[0027] The components are mixed in proportion to obtain the support material.

[0028] The preparation method comprises the following steps:

[0029] The higher fatty alcohol and the plasticizer are mixed and melted to obtain a basic phase change material solution. The basic phase change material solution is added with a tackifying resin to dissolve, and then an auxiliary agent is added to dissolve, and filtered to obtain the support material.

[0030] Furthermore, the melting temperature is 100-125°C.

[0031] Furthermore, the stirring speed of the dissolution is 550-900 r / min.

[0032] Compared with the prior art, the present invention has at least the following beneficial effects:

[0033] The 3D printing support material based on MJP technology provided by the present invention, by embedding high-molecular, high-melting-point, high-freezing-point phase change materials, hinders the combination and crystallization between the main body's lower-molecular, low-melting-point, low-freezing-point phase change material molecules, disrupts the crystal structure of the phase change material, and reduces the interaction force between its molecules, thereby increasing the dissolution rate of the alcohol cleaning solution; at the same time, by introducing high-hydroxyl resin as a thickening resin, according to the similar dissolution mechanism, the high-hydroxyl resin and alcohol solvents have good miscibility, so it is beneficial to accelerate the solubility of the thickening resin in the support material, thereby further increasing the cleaning speed; in addition, the wettability of the plasticizer is used to increase the dissolution rate inside the material, thereby further increasing the cleaning speed of the material; in short, with the coordinated cooperation of each component and its proportion, the present invention improves the dissolution rate of the support material in the alcohol cleaning solution, greatly improves the cleaning and removal speed of the support material in the 3D printed model, not only improves the customer's delivery speed, but also reduces the manufacturing cost.

[0034] The method for preparing 3D printing support materials based on MJP technology provided by the present invention has a simple process, high efficiency, high success rate, and is suitable for factory production. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] According to a first aspect of the present invention, there is provided a 3D printing support material based on MJP technology, comprising the following components in parts by mass:

[0037] 55-70 parts of higher fatty alcohol, 1-5 parts of plasticizer, 25-45 parts of tackifying resin, and 0.1-2 parts of auxiliary agent;

[0038] Typical but non-limiting mass parts of higher fatty alcohols are, for example, 55 parts, 60 parts, 65 parts, and 70 parts; typical but non-limiting mass parts of plasticizers are, for example, 1 part, 2 parts, 3 parts, 4 parts, and 5 parts; typical but non-limiting mass parts of tackifying resins are, for example, 25 parts, 30 parts, 35 parts, 40 parts, and 45 parts; typical but non-limiting mass parts of auxiliary agents are, for example, 0.1 parts, 0.5 parts, 1 part, 1.5 parts, and 2 parts;

[0039] Higher fatty alcohols include, but are not limited to, at least one of cetyl alcohol, stearyl alcohol, behenyl alcohol, hexacosanol, and octacosanol;

[0040] Tackifying resins include, but are not limited to, high hydroxyl resins;

[0041] The hydroxyl value of the high hydroxyl resin can be 30-130 mgKOH / g, for example, 30 mgKOH / g, 40 mgKOH / g, 50 mgKOH / g, 60 mgKOH / g, 70 mgKOH / g, 80 mgKOH / g, 90 mgKOH / g, 100 mgKOH / g, 110 mgKOH / g, 120 mgKOH / g, 130 mgKOH / g, but is not limited thereto.

[0042] The present invention embeds a high-molecular-weight, high-melting-point, high-freezing-point phase-change material to hinder the crystallization between the molecules of the main body's lower-molecular-weight, low-melting-point, low-freezing-point phase-change material, disrupt the crystal structure of the phase-change material, and reduce the interaction force between its molecules, thereby increasing the dissolution rate of the alcohol cleaning solution; at the same time, by introducing a high-hydroxyl resin as a tackifying resin, according to the similar dissolution mechanism, the high-hydroxyl resin has good miscibility with alcohol solvents, which is conducive to accelerating the solubility of the tackifying resin in the supporting material, thereby further increasing the cleaning speed; in addition, the wettability of the plasticizer is used to increase the dissolution rate inside the material, thereby further increasing the cleaning speed of the material.

[0043] In a preferred embodiment, the higher fatty alcohol as the main phase change material can be a combination of octadecyl alcohol, docosanol, hexacosanol and octacosanol, which is more conducive to changing the internal crystal structure of the phase change material and reducing the interaction force between its molecules, thereby further improving the dissolution rate of the alcohol cleaning solution.

[0044] In the present invention, the higher fatty alcohol can be composed of the following components in parts by mass:

[0045] 50-60 parts of stearyl alcohol, 1-8 parts of docosanol, 1-5 parts of hexacosanol, and 1-2 parts of octacosanol.

[0046] Typical but non-limiting weight portions of octadecanol are, for example, 50 parts, 55 parts, and 60 parts; typical but non-limiting weight portions of docosanol are, for example, 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, and 8 parts; typical but non-limiting weight portions of hexacosanol are, for example, 1 part, 2 parts, 3 parts, 4 parts, and 5 parts; and typical but non-limiting weight portions of octacosanol are, for example, 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, and 2 parts.

[0047] In a preferred embodiment, the plasticizer includes but is not limited to at least one of dicyclohexyl phthalate, glyceryl tribenzoate, dioctyl phthalate, dibutyl phthalate and diisobutyl phthalate, and may be further preferably at least one of dioctyl phthalate and glyceryl tribenzoate, which is more conducive to improving the wettability of the material, making it easier for the cleaning liquid to enter the interior of the support material, and further accelerating the dissolution rate inside the material.

[0048] In a preferred embodiment, the tackifying resin, which serves as a material adhesive and a main frame structure, may be a combination of a rosin resin and a high hydroxyl resin.

[0049] It should be noted that the rosin resin may have a softening point of 70-110° C., including but not limited to at least one of hydrogenated rosin glycerol ester (such as Yoshida Chemical BZ05, Xintema Foralyn 90, and Eastman Foral85-E), hydrogenated rosin resin (such as Guangdong Hongtai HR-6, Shanghai Xingan AE-80, and Pinova Foral DX), and modified rosin resin (such as SUNTACKRE 100S, Yoshida SZ8219-F, and Arakawa Chemical 610), and may further preferably be at least one of hydrogenated rosin glycerol ester and hydrogenated rosin resin.

[0050] It should be noted that high hydroxyl resins have a hydroxyl value of 30-130 (mgKOH / g), including but not limited to at least one of aldehyde-ketone resins (such as CT130, KR120 and CT-120A), polyaldehyde resins (such as CT-A81, A81 and A81G), rosin alcohol (such as Arakawa Chemical 6011) and hydroxy acrylic resins (such as BASF 587). It can be further preferably at least one of aldehyde-ketone resins and rosin alcohol, which has better solubility with alcohol cleaning agents, is more conducive to accelerating the dissolution of the resin, and further improves the cleaning and dissolution speed of the material.

[0051] In a preferred embodiment, the additive includes but is not limited to at least one of an antioxidant (such as BASF 1010, 1098 and 168), a leveling agent (such as BYK361), and a dispersant (such as Lubrizol 24000), and may further preferably be an antioxidant.

[0052] In summary, with the synergistic cooperation of various components and their proportions, the present invention increases the dissolution rate of support materials in alcohol cleaning solutions, greatly improving the cleaning and removal speed of support materials in 3D printed models. The support material cleaning speed is more than 30% higher than the current support material cleaning speed.

[0053] According to a second aspect of the present invention, there is provided a method for preparing any one of the above-mentioned support materials, comprising the following steps:

[0054] The components are mixed in proportion to obtain a supporting material.

[0055] The preparation method of the present invention has simple process, high efficiency, high success rate and is suitable for factory production.

[0056] In a preferred embodiment, the preparation method of the present invention comprises the following steps:

[0057] The higher fatty alcohol and the plasticizer are mixed and melted to obtain a basic phase change material solution. The basic phase change material solution is added with a tackifying resin to dissolve, and then an auxiliary agent is added to dissolve, and filtered to obtain a supporting material.

[0058] A typical method for preparing 3D printing support materials based on MJP technology includes the following steps:

[0059] The first step is to mix 55-70 parts by mass of a higher fatty alcohol and 1-5 parts by mass of a plasticizer, and heat and melt them at a melting temperature of 100° C. to obtain a basic phase change material solution;

[0060] The second step is to add 25-45 parts of tackifying resin to the basic phase change material solution according to the weight ratio, and stir to dissolve at a stirring speed of 550-900 r / min and a stirring time of 60-120 min;

[0061] Step 3: Add 0.1-2 parts of the additive by weight and continue stirring to dissolve for 30-60 minutes.

[0062] Step 4: After heating and stirring to completely dissolve, filter and can to obtain the support material.

[0063] The present invention is further described below by way of examples. Unless otherwise specified, the materials in the examples were prepared according to existing methods or directly purchased from the market.

[0064] Examples 1-5

[0065] Examples 1-5 provide a 3D printing support material based on MJP technology, and the components and their mass fractions are shown in Table 1.

[0066] Example 6

[0067] This embodiment is a method for preparing the supporting material of embodiments 1-5, comprising the following steps:

[0068] The first step is to mix the higher fatty alcohol and the plasticizer according to the mass fraction, heat and melt them, and the melting temperature is 110° C. After melting, a basic phase change material solution is obtained;

[0069] The second step is to add the tackifying resin to the basic phase change material solution according to the mass fraction, and stir to dissolve at a stirring speed of 700 r / min and a stirring time of 90 min;

[0070] The third step is to add the additive according to the mass fraction and continue to stir and dissolve for 45 minutes;

[0071] Step 4: After heating and stirring to completely dissolve, filter and can to obtain the support material.

[0072] Comparative Examples 1-3

[0073] Comparative Examples 1-3 provide a 3D printing support material based on MJP technology, and the components and their mass fractions are shown in Table 1;

[0074] The preparation method is referred to Example 6.

[0075] Table 1

[0076]

[0077] Test example

[0078] The cleaning speed of the support materials obtained in Examples 1-5 and Comparative Examples 1-3 was tested, and the results are shown in Table 2.

[0079] Table 2

[0080]

[0081] It can be seen that the present invention solves the technical problem of slow cleaning speed of existing support materials, achieves the purpose of increasing the dissolution rate of support materials in alcohol cleaning solutions and significantly improving the cleaning and removal speed of support materials in 3D printed models.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A 3D printing support material based on MJP technology, characterized in that: It includes the following components in parts by mass: 55-70 parts of higher fatty alcohol, 1-5 parts of plasticizer, 25-45 parts of tackifying resin, and 0.1-2 parts of auxiliary agent; The higher fatty alcohol includes at least one of cetyl alcohol, stearyl alcohol, behenyl alcohol, hexacosanol and octacosanol; The tackifying resin includes a high hydroxyl resin; The high hydroxyl resin has a hydroxyl value of 30-130 mgKOH / g.

2. The support material according to claim 1, characterized in that The higher fatty alcohol comprises the following components in parts by mass: 50-60 parts of stearyl alcohol, 1-8 parts of docosanol, 1-5 parts of hexacosanol, and 1-2 parts of octacosanol.

3. The support material according to claim 1, characterized in that The plasticizer includes at least one of dicyclohexyl phthalate, glyceryl tribenzoate, dioctyl phthalate, dibutyl phthalate and diisobutyl phthalate; Preferably, the plasticizer is at least one of dioctyl phthalate and glyceryl tribenzoate.

4. The support material according to claim 1, characterized in that The tackifying resin is rosin resin and high hydroxyl resin; Preferably, the softening point of the rosin resin is 70-110°C; Preferably, the rosin resin includes at least one of hydrogenated rosin glycerol ester, hydrogenated rosin resin and modified rosin resin; Preferably, the rosin-based resin is at least one of hydrogenated rosin glycerol ester and hydrogenated rosin resin.

5. The supporting material according to any one of claims 1 to 4, characterized in that: The high hydroxy resin includes at least one of aldehyde-ketone resin, polyaldehyde resin, rosin alcohol and hydroxy acrylic resin; Preferably, the high hydroxyl resin is at least one of aldehyde-ketone resin and rosin alcohol.

6. The supporting material according to any one of claims 1 to 4, characterized in that: The auxiliary agent includes at least one of an antioxidant, a leveling agent and a dispersant; Preferably, the auxiliary agent is an antioxidant.

7. A method for preparing the support material according to any one of claims 1 to 6, characterized in that: The following steps are involved: The components are mixed in proportion to obtain the support material.

8. The preparation method according to claim 7, characterized in that The preparation method comprises the following steps: The higher fatty alcohol and the plasticizer are mixed and melted to obtain a basic phase change material solution. The basic phase change material solution is added with a tackifying resin to dissolve, and then an auxiliary agent is added to dissolve, and filtered to obtain the support material.

9. The preparation method according to claim 8, characterized in that The melting temperature is 100-125°C.

10. The preparation method according to claim 8, characterized in that The stirring speed of the dissolution is 550-900 r / min.

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