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3D printing high-molecular polyformaldehyde powder and preparation method

A 3D printing, high molecular weight technology, applied in the field of preparation of polyoxymethylene powder, can solve the problems of harsh control conditions, complicated process, increase the complexity and cost of production methods, and achieve the effect of good comprehensive performance of products

Inactive Publication Date: 2014-08-13
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

U.S. Patent No. 2994687 uses aliphatic anhydrides to end caps to prepare high-molecular-weight polyoxymethylene, but this method requires a large amount of acetic anhydride, which increases the complexity and expense of the production method
U.S. Patent No. 5,458,839 prepares linear high-molecular-weight copolymerized polyoxymethylene by controlling the polymerization process conditions, but due to the complex process and harsh control conditions, it is difficult to realize industrial production
[0006] On the other hand, polyoxymethylene has poor processing thermal stability, and it is prone to thermal degradation and thermo-oxidative degradation at the sintering temperature.

Method used

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  • 3D printing high-molecular polyformaldehyde powder and preparation method
  • 3D printing high-molecular polyformaldehyde powder and preparation method
  • 3D printing high-molecular polyformaldehyde powder and preparation method

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Experimental program
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Effect test

Embodiment 1

[0042] Using cyclohexane as a solvent, put 32g of refined paraformaldehyde and 0.64g of dioxolane in a reaction kettle, raise the temperature to 50°C, and add 0.0032g of boron trifluoride-diethyl ether complex under constant stirring. During the polymerization process, 25°C cooling water was introduced, and the temperature in the kettle was controlled at about 50°C for 2 hours. Put the reaction material into the termination kettle, add 0.032g of antioxidant 1098, 0.032g of melamine and 0.064g of sodium stearate in sequence, and stir for 1 hour to obtain a white polyoxymethylene powder with a weight average molecular weight of 100,000 and a particle size of 100 microns The mechanical properties of the 3D printed products are shown in Table 1.

Embodiment 2

[0044]Using petroleum ether as a solvent, put 64g of refined paraformaldehyde and 0.64g of dioxolane in a reaction kettle, raise the temperature to 60°C, and add a mixture of 0.0032g of paratungstic acid and 0.64g of dioxolane under constant stirring liquid. During the polymerization process, 30°C cooling water was introduced, and the temperature in the kettle was controlled at about 60°C for 1.5 hours. Put the reaction material into the termination tank, add 0.16g of antioxidant 1096, 0.064g of polyamide PA6 and 0.128g of calcium hydroxide in sequence, and stir for 0.5h to obtain a white polyamide with a weight average molecular weight of 120,000 and a particle size of 20 microns. The mechanical properties of formaldehyde powder and 3D printing products are shown in Table 1.

Embodiment 3

[0046] Using dichloroethane as a solvent, put 32g of refined paraformaldehyde and 0.64g of 1,4-butanediol formal in a reaction kettle, raise the temperature to 70°C, add 0.0032g of n-butyl phosphomolybdic acid under constant stirring base ether solution. During the polymerization process, 35°C cooling water was introduced, and the temperature in the kettle was controlled at about 70°C for 1 hour. Put the reaction material into the termination tank, add 0.16g of antioxidant 168, 0.064g of polyamide PA66 and 0.128g of magnesium hydroxide in sequence, and stir for 1 hour to obtain a white polyoxymethylene with a weight average molecular weight of 150,000 and a particle size of 60 microns. The mechanical properties of powder and 3D printing products are shown in Table 1.

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Abstract

The invention provides a 3D printing high-molecular polyformaldehyde powder which is characterized in that raw materials comprise, by weight, 100 parts of trioxymethylene, 2-5 parts of a comonomer, 0.005-1 part of an initiator, 0.1-0.5 part of a molecular weight modifier, 0.1-0.5 part of an antioxidant, 0.1-0.5 part of a formaldehyde absorbent, and 0.1-0.5 part of a formic acid absorbent. The polyformaldehyde powder provided by the invention has the following characteristics: weight-average molecular weight can reach 80-150 thousand; melting temperature is 160-180 DEG C; and partical size is 20-100 microns. The polyformaldehyde powder can be used in 3D printing molding, and a product has better integrated performance than a product prepared from a common polyformaldehyde powder.

Description

technical field [0001] The invention relates to a preparation method of polyoxymethylene powder, in particular to a high molecular weight polyoxymethylene powder used for 3D printing materials and a preparation method thereof. Background technique [0002] 3D printing technology (Three Dimensions Printing, three-dimensional printing technology, 3DP) is based on the computer three-dimensional design model, through the software layered discrete and numerical control molding system, using laser beams, hot-melt nozzles, etc. to process metal powder, ceramic powder, plastic , cell tissue and other special materials are piled up and bonded layer by layer, and finally superimposed to form a physical product. Unlike the traditional manufacturing industry, which shapes and cuts raw materials through mechanical processing methods such as moulds, turning and milling to finally produce finished products, 3D printing transforms a three-dimensional entity into several two-dimensional plan...

Claims

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Application Information

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IPC IPC(8): C08G2/22C08G2/24C08L59/04B29C67/00
Inventor 马永梅赵斌张京楠曹新宇赵宁董金勇李春成符文鑫林学春孙文华
Owner INST OF CHEM CHINESE ACAD OF SCI
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