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Modified polyvinyl alcohol used as supporting material, preparation method and removal method

A polyvinyl alcohol and support material technology, applied in 3D object support structures, additive manufacturing, manufacturing tools, etc., can solve problems such as easy moisture absorption deformation, affecting the printing accuracy of solid structures, and damage to solid structures.

Active Publication Date: 2021-07-30
浙江柏明胜医疗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyvinyl alcohol has two defects when it is used as a support material for 3D printing: one is that polyvinyl alcohol has strong hygroscopicity, and it is easy to absorb moisture and deform in the air, which affects the printing accuracy of the solid structure; There is a swelling process, and the volume expands, causing a certain degree of damage to the solid structure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Sodium chloride is first dissolved in deionized water to form a saturated sodium chloride solution, and then sprayed and deposited on the surface of porous silica microspheres to obtain silica microspheres that adsorb sodium chloride; sodium chloride, porous silica The mass ratio of the microspheres is 2:1; then the silica microspheres adsorbing sodium chloride, polyvinyl alcohol PVA1799, and compound plasticizer (composed of magnesium chloride, caprolactam, and ethylene glycol in a mass ratio of 1:2:4 composition) into a high-speed mixer, raise the temperature to 120°C, and mix at a speed of 120r / min for 10 minutes to obtain a blend; The mass ratio is 30:100:30; and then the blend is extruded into a filamentous wire by twin-screw extruder (the heating temperature of each section is 180°C, 190°C, 200°C, 210°C, 200°C). A modified polyvinyl alcohol material is obtained.

[0035] The obtained modified polyvinyl alcohol material was printed by a 3D printer into a test bloc...

Embodiment 2

[0037] Sodium chloride is first dissolved in deionized water to form a saturated sodium chloride solution, and then sprayed and deposited on the surface of porous silica microspheres to obtain silica microspheres that adsorb sodium chloride; sodium chloride, porous silica The mass ratio of the microspheres is 3:1; then the silica microspheres adsorbing sodium chloride, polyvinyl alcohol PVA1799, and compound plasticizer (made of magnesium chloride, caprolactam, and ethylene glycol in a mass ratio of 1:1:5 composition) into a high-speed mixer, raise the temperature to 110°C, and mix at a speed of 90r / min for 20 minutes to obtain a blend; The mass ratio is 30:100:31; then the blend is extruded into a filamentous wire by using a twin-screw extruder (the heating temperature of each section is 180°C, 190°C, 200°C, 210°C, 200°C). A modified polyvinyl alcohol material is obtained.

[0038] The obtained modified polyvinyl alcohol material was printed by a 3D printer into a test block...

Embodiment 3

[0040] Sodium chloride is first dissolved in deionized water to form a saturated sodium chloride solution, and then sprayed and deposited on the surface of porous silica microspheres to obtain silica microspheres that adsorb sodium chloride; sodium chloride, porous silica The mass ratio of the microspheres is 2:1; then the silica microspheres adsorbing sodium chloride, polyvinyl alcohol PVA1799, and compound plasticizer (composed of magnesium chloride, caprolactam, and ethylene glycol in a mass ratio of 1:2:4 composition) into a high-speed mixer, raise the temperature to 110°C, and mix at a speed of 90r / min for 20 minutes to obtain a blend; The mass ratio is 35:100:32; then the blend is extruded into a filamentous wire by using a twin-screw extruder (the heating temperature of each section is 180°C, 190°C, 200°C, 210°C, 200°C). A modified polyvinyl alcohol material is obtained.

[0041] The obtained modified polyvinyl alcohol material was printed by a 3D printer into a test b...

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PUM

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Abstract

The invention relates to the technical field of high polymer material modification, and provides modified polyvinyl alcohol used as a supporting material, a preparation method and a removal method. The modified polyvinyl alcohol is prepared from silica microspheres adsorbing sodium chloride, polyvinyl alcohol and a compound plasticizer through high-speed blending and melt extrusion. Compared with traditional methods, by adding the silicon dioxide microspheres adsorbing sodium chloride into the polyvinyl alcohol, the hygroscopicity of the supporting material can be reduced, the hygroscopic deformation can be reduced, the printing precision of a solid structure can be improved, a space can be provided for swelling of the polyvinyl alcohol through rapid dissolution of sodium chloride, damage to the solid structure is reduced, and the obtained modified polyvinyl alcohol has good supporting capability.

Description

technical field [0001] The invention belongs to the technical field of polymer material modification, and provides a modified polyvinyl alcohol used as a supporting material, a preparation method and a removal method. Background technique [0002] 3D printing is a rapid prototyping technology, which has the advantages of saving materials, no need for molds, high degree of automation, and can prepare complex parts. . Polymer materials are used for 3D printing by fused deposition molding. First, the filamentary plastic is heated to a certain temperature by means of electric heating. Through the reasonable control of the computer, a certain amount of molten material is covered on the workbench and accumulated into a certain number of layers. Finally, a three-dimensional product is formed. Polymer materials that can be used for 3D printing include ABS, PLA, PC, etc. [0003] Fused deposition modeling is based on the principle of discrete-accumulation molding and the idea of ​...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08K13/06C08K9/12C08K3/16C08K7/26C08K5/053C08K5/3412B33Y70/10B33Y40/20B29C64/40
CPCC08K13/06C08K9/12C08K3/16C08K7/26C08K5/053C08K5/3412B33Y70/10B33Y40/20B29C64/40C08K2003/166C08L29/04
Inventor 阮媛媛
Owner 浙江柏明胜医疗科技有限公司
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