CN111995773A - Method for drying nylon powder suspension for selective laser sintering - Google Patents
Method for drying nylon powder suspension for selective laser sintering Download PDFInfo
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Abstract
The invention provides a drying method of nylon powder suspension for selective laser sintering, which comprises the following steps: mixing nylon resin and a solvent according to a mass ratio of 1: 3-10, preparing a nylon powder suspension by a solvent precipitation method, and performing centrifugal treatment and primary vibration screening on the nylon powder suspension to obtain nylon powder wet powder; carrying out primary microwave drying on the wet nylon powder, then crushing the wet nylon powder, and carrying out secondary vibration screening to obtain semi-dry nylon powder, wherein the drying pressure of the primary microwave drying is-0.75 MPa to-0.5 MPa, the drying temperature is 35 to 55 ℃, the vibration frequency of the secondary vibration screening is 500 to 1200RPM, and the mesh number of the screen is 60 to 120 meshes; and carrying out secondary microwave drying and screening on the semi-dry nylon powder to obtain nylon powder suitable for selective laser sintering, wherein the drying pressure of the secondary microwave drying is-0.95 to-0.7 MPa, and the drying temperature is 55 to 80 ℃. The method has the advantages of small equipment investment, simple process, good drying effect and high powder yield.
Description
Technical Field
The invention belongs to the technical field of additive manufacturing, and particularly relates to a drying method of nylon powder suspension for selective laser sintering.
Background
The selective laser sintering technique, which is a new manufacturing technique rapidly developed in recent years, is a method of manufacturing a three-dimensional object by selectively fusing a plurality of powder layers, which allows to obtain a three-dimensional entity by laser sintering a plurality of superposed layers of powder according to a three-dimensional image of the object to be produced without using tooling.
Currently, in the field of selective laser sintering, nylon powder materials are a very large class of materials, and the solvent precipitation method is the main method used in this field for manufacturing nylon powder. The solvent precipitation method is that nylon resin particles, a solvent and an auxiliary agent are added into a closed high-temperature high-pressure reaction kettle together, then the nylon resin particles are dissolved by heating, then the temperature of the materials is reduced, and the nylon is separated out from the solvent by controlling stirring and reducing the temperature, so as to obtain nylon powder suspension.
The negative pressure suction filtration re-drying, spray drying, fluidized bed drying and the like can be used for drying nylon powder suspension, wherein the negative pressure suction filtration nylon powder suspension has low efficiency and poor effect, the suspension needs to be integrally heated in the spray drying, the fluidized bed drying and the like, the energy consumption is greatly increased, and meanwhile, the equipment has large volume and high price, which undoubtedly causes the rise of the material manufacturing cost.
Disclosure of Invention
The invention aims to provide a drying method of nylon powder suspension for selective laser sintering, which obtains nylon powder with particle size and moisture content meeting requirements by controlling parameters of centrifugation, sieving and microwave drying, and enables the nylon powder to meet the requirements of selective laser sintering.
The invention provides a drying method of nylon powder suspension for selective laser sintering, which comprises the following steps:
(1) mixing nylon resin and a solvent according to a mass ratio of 1: 3-10, preparing a nylon powder suspension by a solvent precipitation method, and performing centrifugal treatment and primary vibration screening on the nylon powder suspension to obtain nylon powder wet powder;
(2) carrying out primary microwave drying on the wet nylon powder, then crushing the wet nylon powder, and carrying out secondary vibration screening to obtain semi-dry nylon powder, wherein the drying pressure of the primary microwave drying is-0.75 MPa to-0.5 MPa, the drying temperature is 35 to 55 ℃, the vibration frequency of the secondary vibration screening is 500 to 1200RPM, and the mesh number of the screen is 60 to 120 meshes;
(3) and carrying out secondary microwave drying and screening on the semi-dry nylon powder to obtain nylon powder suitable for selective laser sintering, wherein the drying pressure of the secondary microwave drying is-0.95 to-0.7 MPa, and the drying temperature is 55 to 80 ℃.
Further preferably, the centrifugal rotating speed and the centrifugal time of the centrifugal treatment are respectively 500-1200 RPM and 30-120 min.
Further preferably, the vibration frequency of the first vibration sieving is 500-1500 RPM, and the aperture of the sieve is 2-8 mm.
Further preferably, the moisture content of the wet nylon powder is 30-55%.
Further preferably, the moisture content of the nylon powder semi-dry powder is 2-12%.
Further preferably, the nylon powder for selective laser sintering has a moisture content of 0.1 to 0.6%.
Further preferably, the nylon powder for selective laser sintering has a particle size ranging from 30 to 120 μm.
Further preferably, the screening process is specifically air classification after vibrating screening, the vibration frequency of the screening is 1000-.
Further preferably, the solvent is an alcohol solvent, a ketone solvent or water.
Further preferably, the nylon resin is PA12, PA1212, PA1012, PA1010, PA612, PA610, PA6, PA46, PA66, PA56, PA513 or PA514
According to the method for drying the nylon powder suspension for selective laser sintering, provided by the invention, the nylon powder suspension is processed through the steps of centrifugation, sieving, microwave drying, crushing and sieving, microwave drying, sieving, air classification and the like, the drying efficiency and effect are improved by reasonably controlling parameters of each stage in the processing process, the waste caused by powder agglomeration in the drying process is reduced, and the nylon powder particles suitable for the field of selective laser sintering are finally obtained.
Detailed Description
The invention relates to a drying method of nylon powder suspension for laser sintering, which comprises the steps of firstly carrying out centrifugal treatment on the nylon powder suspension to remove most of solvent in the suspension so as to obtain nylon wet powder, then sieving the nylon wet powder to reduce agglomeration of the wet powder, then carrying out microwave drying to remove the solvent in the wet powder so as to reduce the moisture content of the powder to a certain value so as to obtain semi-dry powder, crushing the semi-dry powder by a crusher, sieving the semi-dry powder by a vibrating sieve, carrying out microwave drying to obtain dry powder, and carrying out sieving treatment on the dry powder so as to obtain powder particles with the particle size range of 30-120 micrometers.
The inventor of the invention thinks that the nylon powder suspension prepared by the solvent precipitation method contains a large amount of solvent, the mass of the solvent is often several times of that of the nylon resin, if the powder suspension is directly dried, a large amount of heat is consumed, most of the solvent is removed by centrifugally treating the suspension, so that the energy is saved, and the drying efficiency is improved; the 'wet powder' obtained after centrifugation is often agglomerated to a certain degree, if the 'wet powder' is directly subjected to microwave drying without treatment, the agglomerates are adhered together along with the rise of temperature and the volatilization of a solvent to generate 'hard blocks' during microwave drying, the 'hard blocks' are often difficult to be crushed into powder particles below 150 microns at normal temperature, so that the powder particles cannot be used for selective laser sintering, the material waste is caused, the 'wet powder' agglomeration phenomenon is improved after the 'wet powder' is treated by a vibrating screen, and the 'hard blocks' generated during microwave drying are obviously reduced; however, the powder has high humidity and still has strong adhesion, a large amount of fine hard blocks can be generated during microwave drying, in order to further eliminate the hard blocks, two-step microwave drying is adopted in the invention, the first step of microwave drying controls the humidity of the powder within a certain range to obtain semi-dry powder, the semi-dry powder can be crushed at normal temperature and can not be adhered during subsequent microwave drying, then the semi-dry powder is crushed and sieved, the particle sizes of all the semi-dry powder are below a reasonable value, and finally the semi-dry powder is further subjected to microwave drying to obtain the required powder. The method of the invention has high drying efficiency, is simple, effectively avoids the loss of materials in the process from suspension to powder, and is very suitable for industrially drying nylon powder suspension materials.
The present invention will be described in further detail below with reference to specific examples.
Example 1
Adding 10kg of nylon 1212 resin and 80kg of ethanol into a closed reaction kettle, heating and cooling to obtain nylon 1212 powder suspension; centrifuging the powder suspension, and treating with a vibrating screen to obtain wet nylon 1212 powder, wherein the centrifuging speed is 1000RPM, the time is 60min, the vibration frequency of the vibrating screen is 1000RPM, and the mesh opening diameter is 3mm, and the moisture content of the wet nylon 1212 powder is tested; carrying out first microwave drying, crushing and vibrating screen treatment on the wet nylon 1212 powder to obtain semi-dry nylon 1212 powder, wherein the microwave drying pressure is-0.7 MPa, the highest temperature is 45 ℃, the vibrating frequency of a vibrating screen is 800RPM, the mesh number of a screen is 80 meshes, and the humidity of the semi-dry nylon 1212 powder is tested; and (3) carrying out secondary microwave drying and vibrating screen treatment on the semi-dry powder of the nylon 1212 to obtain dry powder of the nylon 1212, wherein the microwave drying pressure is-0.9 MPa, the highest temperature is 70 ℃, the vibrating frequency of a vibrating screen is 1200RPM, the mesh number of the screen is 120 meshes, the humidity of the dry powder of the nylon 1212 is tested, and the weight of the dry powder of the nylon 1212 is weighed.
Comparative example 1
Adding 10kg of nylon 1212 resin and 80kg of ethanol into a closed reaction kettle, heating and cooling to obtain nylon 1212 powder suspension; centrifuging the powder suspension to prepare nylon 1212 wet powder, and testing the moisture content of the nylon 1212 wet powder at a centrifugal rotation speed of 1000RPM for 60 min; carrying out first microwave drying, crushing and vibrating screen treatment on the wet nylon 1212 powder to obtain semi-dry nylon 1212 powder, wherein the microwave drying pressure is-0.7 MPa, the highest temperature is 45 ℃, the vibrating frequency of a vibrating screen is 800RPM, the mesh number of a screen is 80 meshes, and the humidity of the semi-dry nylon 1212 powder is tested; and (3) carrying out secondary microwave drying and vibrating screen treatment on the semi-dry powder of the nylon 1212 to obtain dry powder of the nylon 1212, wherein the microwave drying pressure is-0.9 MPa, the highest temperature is 70 ℃, the vibrating frequency of a vibrating screen is 1200RPM, the mesh number of the screen is 120 meshes, the humidity of the dry powder of the nylon 1212 is tested, and the weight of the dry powder of the nylon 1212 is weighed.
Comparative example 2
Adding 10kg of nylon 1212 resin and 80kg of ethanol into a closed reaction kettle, heating and cooling to obtain nylon 1212 powder suspension; centrifuging the powder suspension, and treating with a vibrating screen to obtain wet nylon 1212 powder, wherein the centrifuging speed is 1000RPM, the time is 60min, the vibration frequency of the vibrating screen is 1000RPM, and the mesh opening diameter is 3mm, and the moisture content of the wet nylon 1212 powder is tested; and (3) carrying out microwave drying, crushing and vibrating screen treatment on the wet nylon 1212 powder to obtain dry nylon 1212 powder, wherein the microwave drying pressure is-0.9 MPa, the highest temperature is 70 ℃, the vibrating frequency of a vibrating screen is 1200RPM, the mesh number of the vibrating screen is 120 meshes, the humidity of the dry nylon 1212 powder is tested, and the weight of the dry nylon 1212 powder is weighed.
Comparative example 3
Adding 10kg of nylon 1212 resin and 80kg of ethanol into a closed reaction kettle, heating and cooling to obtain nylon 1212 powder suspension; centrifuging the powder suspension, and treating with a vibrating screen to obtain wet nylon 1212 powder, wherein the centrifuging speed is 1000RPM, the time is 60min, the vibration frequency of the vibrating screen is 1000RPM, and the mesh opening diameter is 3mm, and the moisture content of the wet nylon 1212 powder is tested; carrying out first microwave drying, crushing and vibrating screen treatment on the wet nylon 1212 powder to obtain semi-dry nylon 1212 powder, wherein the microwave drying pressure is-0.7 MPa, the highest temperature is 45 ℃, the vibrating frequency of a vibrating screen is 800RPM, the mesh number of a screen is 80 meshes, and the humidity of the semi-dry nylon 1212 powder is tested; and (3) carrying out secondary microwave drying and vibrating screen treatment on the semi-dry powder of the nylon 1212 to obtain dry powder of the nylon 1212, wherein the microwave drying pressure is-0.9 MPa, the highest temperature is 60 ℃, the vibration frequency of a vibrating screen is 1200RPM, the mesh number of the screen is 120 meshes, the humidity of the dry powder of the nylon 1212 is tested, and the weight of the dry powder of the nylon 1212 is weighed.
Comparative example 4
Adding 10kg of nylon 1212 resin and 80kg of ethanol into a closed reaction kettle, heating and cooling to obtain nylon 1212 powder suspension; centrifuging the powder suspension, and treating with a vibrating screen to obtain wet nylon 1212 powder, wherein the centrifuging speed is 1000RPM, the time is 40min, the vibration frequency of the vibrating screen is 1000RPM, and the mesh opening diameter is 3mm, and the moisture content of the wet nylon 1212 powder is tested; carrying out first microwave drying, crushing and vibrating screen treatment on the wet nylon 1212 powder to obtain semi-dry nylon 1212 powder, wherein the microwave drying pressure is-0.7 MPa, the highest temperature is 45 ℃, the vibrating frequency of a vibrating screen is 800RPM, the mesh number of a screen is 80 meshes, and the humidity of the semi-dry nylon 1212 powder is tested; and (3) carrying out secondary microwave drying and vibrating screen treatment on the semi-dry powder of the nylon 1212 to obtain dry powder of the nylon 1212, wherein the microwave drying pressure is-0.9 MPa, the highest temperature is 70 ℃, the vibrating frequency of a vibrating screen is 1200RPM, the mesh number of the screen is 120 meshes, the humidity of the dry powder of the nylon 1212 is tested, and the weight of the dry powder of the nylon 1212 is weighed.
Comparative example 5
Adding 10kg of nylon 1212 resin and 80kg of ethanol into a closed reaction kettle, heating and cooling to obtain nylon 1212 powder suspension; centrifuging the powder suspension, and treating with a vibrating screen to obtain wet nylon 1212 powder, wherein the centrifuging speed is 1000RPM, the time is 80min, the vibration frequency of the vibrating screen is 1000RPM, and the mesh opening diameter is 3mm, and the moisture content of the wet nylon 1212 powder is tested; carrying out first microwave drying, crushing and vibrating screen treatment on the wet nylon 1212 powder to obtain semi-dry nylon 1212 powder, wherein the microwave drying pressure is-0.7 MPa, the highest temperature is 45 ℃, the vibrating frequency of a vibrating screen is 800RPM, the mesh number of a screen is 80 meshes, and the humidity of the semi-dry nylon 1212 powder is tested; and (3) carrying out secondary microwave drying and vibrating screen treatment on the semi-dry powder of the nylon 1212 to obtain dry powder of the nylon 1212, wherein the microwave drying pressure is-0.9 MPa, the highest temperature is 70 ℃, the vibrating frequency of a vibrating screen is 1200RPM, the mesh number of the screen is 120 meshes, the humidity of the dry powder of the nylon 1212 is tested, and the weight of the dry powder of the nylon 1212 is weighed.
Comparative example 6
Adding 10kg of nylon 1212 resin and 80kg of ethanol into a closed reaction kettle, heating and cooling to obtain nylon 1212 powder suspension; centrifuging the powder suspension, performing vibration sieve treatment to obtain nylon 1212 wet powder, performing centrifugation at 600RPM for 60min, vibrating at 1000RPM with a vibration sieve, and testing the moisture content of the nylon 1212 wet powder, wherein the sieve mesh diameter is 3 mm; carrying out first microwave drying, crushing and vibrating screen treatment on the wet nylon 1212 powder to obtain semi-dry nylon 1212 powder, wherein the microwave drying pressure is-0.7 MPa, the highest temperature is 45 ℃, the vibrating frequency of a vibrating screen is 800RPM, the mesh number of a screen is 80 meshes, and the humidity of the semi-dry nylon 1212 powder is tested; and (3) carrying out secondary microwave drying and vibrating screen treatment on the semi-dry powder of the nylon 1212 to obtain dry powder of the nylon 1212, wherein the microwave drying pressure is-0.9 MPa, the highest temperature is 70 ℃, the vibrating frequency of a vibrating screen is 1200RPM, the mesh number of the screen is 120 meshes, the humidity of the dry powder of the nylon 1212 is tested, and the weight of the dry powder of the nylon 1212 is weighed.
Comparative example 7
Adding 10kg of nylon 1212 resin and 80kg of ethanol into a closed reaction kettle, heating and cooling to obtain nylon 1212 powder suspension; centrifuging the powder suspension, performing vibration sieve treatment to obtain nylon 1212 wet powder, performing centrifugation at 1000RPM for 60min, vibrating at 1000RPM with a vibration sieve, and testing the moisture content of the nylon 1212 wet powder, wherein the sieve mesh diameter is 6 mm; carrying out first microwave drying, crushing and vibrating screen treatment on the wet nylon 1212 powder to obtain semi-dry nylon 1212 powder, wherein the microwave drying pressure is-0.7 MPa, the highest temperature is 45 ℃, the vibrating frequency of a vibrating screen is 800RPM, the mesh number of a screen is 80 meshes, and the humidity of the semi-dry nylon 1212 powder is tested; and (3) carrying out secondary microwave drying and vibrating screen treatment on the semi-dry powder of the nylon 1212 to obtain dry powder of the nylon 1212, wherein the microwave drying pressure is-0.9 MPa, the highest temperature is 70 ℃, the vibrating frequency of a vibrating screen is 1200RPM, the mesh number of the screen is 120 meshes, the humidity of the dry powder of the nylon 1212 is tested, and the weight of the dry powder of the nylon 1212 is weighed.
Comparative example 8
Adding 10kg of nylon 1212 resin and 80kg of ethanol into a closed reaction kettle, heating and cooling to obtain nylon 1212 powder suspension; centrifuging the powder suspension, and treating with a vibrating screen to obtain wet nylon 1212 powder, wherein the centrifuging speed is 1000RPM, the time is 60min, the vibration frequency of the vibrating screen is 1000RPM, and the mesh opening diameter is 3mm, and the moisture content of the wet nylon 1212 powder is tested; carrying out first microwave drying, crushing and vibrating screen treatment on the wet nylon 1212 powder to obtain semi-dry nylon 1212 powder, wherein the microwave drying pressure is-0.7 MPa, the highest temperature is 55 ℃, the vibrating frequency of a vibrating screen is 800RPM, the mesh number of a screen is 80 meshes, and the humidity of the semi-dry nylon 1212 powder is tested; and (3) carrying out secondary microwave drying and vibrating screen treatment on the semi-dry powder of the nylon 1212 to obtain dry powder of the nylon 1212, wherein the microwave drying pressure is-0.9 MPa, the highest temperature is 70 ℃, the vibrating frequency of a vibrating screen is 1200RPM, the mesh number of the screen is 120 meshes, the humidity of the dry powder of the nylon 1212 is tested, and the weight of the dry powder of the nylon 1212 is weighed.
Comparative example 9
Adding 10kg of nylon 1212 resin and 80kg of ethanol into a closed reaction kettle, heating and cooling to obtain nylon 1212 powder suspension; centrifuging the powder suspension, and treating with a vibrating screen to obtain wet nylon 1212 powder, wherein the centrifuging speed is 1000RPM, the time is 60min, the vibration frequency of the vibrating screen is 1000RPM, and the mesh opening diameter is 3mm, and the moisture content of the wet nylon 1212 powder is tested; carrying out first microwave drying, crushing and vibrating screen treatment on the wet nylon 1212 powder to obtain semi-dry nylon 1212 powder, wherein the microwave drying pressure is-0.7 MPa, the highest temperature is 35 ℃, the vibrating frequency of a vibrating screen is 800RPM, the mesh number of a screen is 80 meshes, and the humidity of the semi-dry nylon 1212 powder is tested; and (3) carrying out secondary microwave drying and vibrating screen treatment on the semi-dry powder of the nylon 1212 to obtain dry powder of the nylon 1212, wherein the microwave drying pressure is-0.9 MPa, the highest temperature is 70 ℃, the vibrating frequency of a vibrating screen is 1200RPM, the mesh number of the screen is 120 meshes, the humidity of the dry powder of the nylon 1212 is tested, and the weight of the dry powder of the nylon 1212 is weighed.
Example 2
Adding 10kg of nylon 6 resin, 40kg of methanol and 40kg of deionized water into a closed reaction kettle, heating and cooling to obtain nylon 6 powder suspension; centrifuging the powder suspension, performing vibration sieve treatment to obtain nylon 6 wet powder, performing centrifugation at 1000RPM for 60min, vibrating at 1000RPM with a vibration sieve, and testing the moisture content of the nylon 6 wet powder, wherein the mesh diameter of the sieve is 3 mm; carrying out first microwave drying, crushing and vibrating screen treatment on the nylon 6 wet powder to obtain nylon 6 semi-dry powder, testing the humidity of the nylon 6 semi-dry powder under the microwave drying pressure of-0.7 MPa, the highest temperature of 45 ℃, the vibration frequency of a vibrating screen of 800RPM and the mesh number of a screen of 80 meshes; and (3) carrying out secondary microwave drying and vibrating screen treatment on the nylon 6 semi-dry powder to obtain nylon 6 dry powder, testing the humidity of the nylon 6 dry powder, and weighing the weight of the nylon 6 dry powder, wherein the microwave drying pressure is-0.9 MPa, the highest temperature is 70 ℃, the vibration frequency of a vibrating screen is 1200RPM, and the mesh number of the screen is 120 meshes.
Example 3
Adding 10kg of nylon 46 resin, 40kg of ethanol, 40kg of methanol and an inorganic nucleating agent into a closed reaction kettle, and heating and cooling to obtain nylon 46 powder suspension; centrifuging the powder suspension, performing vibration sieve treatment to obtain nylon 46 wet powder, performing centrifugation at 1000RPM for 60min, vibrating at 1000RPM with a vibration sieve, and testing the moisture content of the nylon 46 wet powder, wherein the mesh diameter of the sieve is 3 mm; carrying out first microwave drying, crushing and vibrating screen treatment on the nylon 46 wet powder to obtain nylon 46 semi-dry powder, testing the humidity of the nylon 46 semi-dry powder under the microwave drying pressure of-0.7 MPa and the highest temperature of 45 ℃, with the vibrating frequency of a vibrating screen of 800RPM and the mesh number of a screen of 80 meshes; and (3) carrying out secondary microwave drying and vibrating screen treatment on the nylon 46 semi-dry powder to obtain nylon 46 dry powder, testing the humidity of the nylon 46 dry powder, and weighing the weight of the nylon 46 dry powder, wherein the microwave drying pressure is-0.9 MPa, the highest temperature is 70 ℃, the vibration frequency of a vibrating screen is 1200RPM, and the mesh number of the screen is 120 meshes.
Example 4
Adding 10kg of nylon 612 resin, 70kg of ethanol and 10kg of butanone into a closed reaction kettle, heating and cooling to obtain nylon 612 powder suspension; centrifuging the powder suspension, performing vibration sieve treatment to obtain nylon 612 wet powder, performing centrifugation at 1000RPM for 60min, vibrating at 1000RPM with a vibration sieve, and testing the moisture content of the nylon 612 wet powder, wherein the mesh diameter of the sieve is 3 mm; carrying out first microwave drying, crushing and vibrating screen treatment on the nylon 612 wet powder to obtain nylon 612 semi-dry powder, wherein the microwave drying pressure is-0.7 MPa, the highest temperature is 45 ℃, the vibrating frequency of a vibrating screen is 800RPM, the mesh number of a screen is 80 meshes, and the humidity of the nylon 612 semi-dry powder is tested; and (3) carrying out secondary microwave drying and vibrating screen treatment on the nylon 612 semi-dry powder to obtain nylon 612 dry powder, testing the humidity of the nylon 612 dry powder, and weighing the weight of the nylon 612 dry powder, wherein the microwave drying pressure is-0.9 MPa, the highest temperature is 70 ℃, the vibration frequency of a vibrating screen is 1200RPM, and the mesh number of the vibrating screen is 120 meshes.
Example 1 is to dry the suspension of nylon 1212 powder according to the preferred embodiment of the present invention, and it can be seen that the yield of nylon 1212 powder material can reach 98.1% (nylon 1212 has a certain dissolution in ethanol, and cannot be completely precipitated from the solvent in the form of solid powder); comparative example 1, in which the process of sieving wet powders was removed, the powder yield was reduced by 16.3%, a large amount of wet powders agglomerated together after centrifugation, and the agglomerated wet powders were directly dried without sieving and agglomerated (could not be pulverized by a conventional process), resulting in powder waste; in comparative example 2, only one microwave drying is performed, the powder yield is reduced by 24.2%, and the wet powder is dried in place in one step to generate a large amount of nylon blocks (which cannot be crushed by the conventional process), so that the powder is wasted; comparative examples 1, 2 illustrate that the effect of "wet powder" sieving and secondary microwave drying on the yield of the powder material in the present invention is very critical; in examples 3 to 9, parameters such as centrifugal time, centrifugal rotation speed, screen mesh size of wet powder sieving, first microwave drying temperature, second microwave drying and the like are adjusted, and it is found that the parameters can affect the yield of powder and the final drying effect of the powder, and both efficiency and effect are considered, the inventor thinks that the drying agent is used for drying nylon 1212 powder suspension, and the scheme shown in example 1 is a preferable scheme; in examples 2-4, powders with low moisture and high yield were obtained by drying with PA6, PA46, and PA612, respectively, using the preferred embodiment of the present invention.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations and modifications can be made on the basis of the above description, and not exhaustive enumeration of all embodiments, and obvious variations and modifications of the present invention may be made without departing from the scope of the present invention.
Claims (10)
1. A drying method of nylon powder suspension for selective laser sintering is characterized by comprising the following steps:
(1) mixing nylon resin and a solvent according to a mass ratio of 1: 3-10, preparing a nylon powder suspension by a solvent precipitation method, and performing centrifugal treatment and primary vibration screening on the nylon powder suspension to obtain nylon powder wet powder;
(2) carrying out primary microwave drying on the wet nylon powder, then crushing the wet nylon powder, and carrying out secondary vibration screening to obtain semi-dry nylon powder, wherein the drying pressure of the primary microwave drying is-0.75 MPa to-0.5 MPa, the drying temperature is 35 to 55 ℃, the vibration frequency of the secondary vibration screening is 500 to 1200RPM, and the mesh number of the screen is 60 to 120 meshes;
(3) and carrying out secondary microwave drying and screening on the semi-dry nylon powder to obtain nylon powder suitable for selective laser sintering, wherein the drying pressure of the secondary microwave drying is-0.95 to-0.7 MPa, and the drying temperature is 55 to 80 ℃.
2. The method for drying a nylon powder suspension according to claim 1, wherein the centrifugation rotation speed and the centrifugation time of the centrifugation treatment are 500 to 1200RPM and 30 to 120min, respectively.
3. The method for drying the nylon powder suspension according to claim 2, wherein the first vibrating screen has a vibration frequency of 500 to 1500RPM and a screen aperture of 2 to 8 mm.
4. The method for drying a nylon powder suspension according to claim 3, wherein the wet powder of the nylon powder has a moisture content of 30 to 55%.
5. The method for drying the nylon powder suspension according to claim 4, wherein the moisture content of the semi-dry nylon powder is 2-12%.
6. The method for drying a nylon powder suspension according to claim 5, wherein the nylon powder for selective laser sintering has a moisture content of 0.1 to 0.6%.
7. The method for drying the nylon powder suspension according to claim 6, wherein the nylon powder for selective laser sintering has a particle size in the range of 30 to 120 μm.
8. The method for drying the nylon powder suspension as claimed in claim 7, wherein the screening process is air classification after vibrating screening, the vibration frequency of the screening is 1000-1500RPM, and the mesh number of the screening is 120-200 mesh.
9. The method for drying a nylon powder suspension according to claim 8, wherein the solvent is an alcohol solvent, a ketone solvent or water.
10. The method for drying a nylon powder suspension according to claim 9, wherein the nylon resin is PA12, PA1212, PA1012, PA1010, PA612, PA610, PA6, PA46, PA66, PA56, PA513 or PA 514.
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