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A kind of flame retardant composite material for 3D printing and preparation method thereof

A flame-retardant composite material and 3D printing technology, applied in the field of 3D printing, can solve problems such as fire hazards, release of halogen flame retardants, threats to human health, etc., to improve appearance quality and surface finish, and improve flame-retardant performance and toughness , Improve the effect of free flow

Active Publication Date: 2017-12-01
陈梓煜
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unmodified nylon has poor flame retardancy. Its vertical combustion can only reach UL94V-2 level, its oxygen index is about 24, and it will drip during combustion. It is a flammable material and is very easy to burn during use start a fire
Especially in the field of electronic products, there are countless fires caused by nylon, causing great losses. However, some important nylon resins such as PA6, PA66, PA11, PA12, etc., have certain self-extinguishing properties, but in most In some cases, in order to meet the flame retardancy requirements of electrical appliances and transportation and communication equipment, it is still necessary to add flame retardants to modify the flame retardancy of nylon.
However, most of the flame retardants added to general-purpose flame-retardant nylon are halogen-based flame retardants. Although this flame retardant can play a good flame-retardant effect, it will produce a large amount of acidic smoke when the material is burned, which will cause secondary pollution. secondary hazard
At the same time, the 3D printing temperature of nylon materials is relatively high. During the 3D printing process of halogen flame retardant nylon, some halogen flame retardants will release harmful substances, causing environmental pollution and threatening human health.
Moreover, the current general-purpose flame-retardant nylon has low toughness and is not suitable for 3D printing consumables. The consumables are prone to brittle fracture during the printing process, interrupting the 3D printing molding process, and the barely completed 3D printed products have many defects, are easy to crack, and have low performance. Dimensional stability is low, which does not meet the actual use requirements

Method used

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  • A kind of flame retardant composite material for 3D printing and preparation method thereof

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preparation example Construction

[0039] The present invention also provides a method for preparing a flame-retardant composite material for 3D printing, comprising the following steps:

[0040] Nylon resin, ABS resin, flame retardant, compatibilizer, antioxidant and lubricant are mixed and stirred to obtain a mixture; the mixture is sequentially melt-extruded and wire-drawn to obtain a flame-retardant composite material for 3D printing.

[0041] The present invention first mixes each raw material, and before mixing, preferably nylon resin and ABS resin are carried out pretreatment, concrete method is:

[0042] The nylon resin and the ABS resin are dried in a drying oven, wherein the drying temperature is 90-110° C., and the drying time is 4-8 hours.

[0043] The dried nylon resin and ABS resin are mixed to obtain a mixed resin. Add lubricant, compatibilizer, antioxidant and amorphous red phosphorus to the mixed resin and stir to obtain the mixture. Wherein, the rotation speed of the stirring is 700-1500r / mi...

Embodiment 1

[0052] Weigh respectively 1000g of nylon 6 resin, 400g of ABS resin, 128g of amorphous red phosphorus, 200g of acrylonitrile-butadiene-styrene copolymer grafted with maleic anhydride, tetrakis[β-(3,5-di-tert-butyl -4-hydroxyphenyl)propionic acid]pentaerythritol ester, 5.4g of tris[2.4-di-tert-butylphenyl]phosphite, and 18g of ultra-high molecular weight polysiloxane were put into a high-speed mixer and mixed for 5min. Then it is extruded with a screw extruder and shaped by wire drawing forming equipment. The six stages of melt extrusion temperature are 200°C, 220°C, 225°C, 230°C, 235°C, 240°C respectively, and the screw speed is 80 rpm. The consumables wound into rolls are vacuum-dried and sealed for storage.

[0053] The impact strength and flame retardancy of the obtained flame-retardant composite materials for 3D printing were measured, and the results are shown in Table 1. Table 1 shows the properties of the flame-retardant composite materials for 3D printing provided in ...

Embodiment 2

[0055] Weigh 1000g of nylon 6 resin, 300g of ABS resin, 145g of amorphous red phosphorus, 150g of styrene-maleic anhydride copolymer, N,N'-bis-[3-(3,5-di-tert-butyl-4- Hydroxyphenyl)propionyl]hexamethylenediamine, 4.4g of tris[2.4-di-tert-butylphenyl]phosphite, and 14.5g of stearic acid were put into a high-speed mixer and mixed for 5min. Then it is extruded with a screw extruder and shaped by wire drawing forming equipment. The temperature of the six stages of melt extrusion is 200°C, 220°C, 225°C, 232°C, 237°C, and 245°C, respectively, and the screw speed is 80 rpm. The extruded filament is granulated by pelletizing equipment, and its particle size is adjustable, which is determined by the diameter of the raw silk and the parameters of the pelletizing equipment. Generally, the diameter is 1-3mm, and the length is between 0.5mm-5mm.

[0056] The impact strength and flame retardancy of the obtained flame-retardant composite materials for 3D printing were measured, and the res...

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Abstract

The invention provides a flame-retardant composite material for 3D printing, which comprises the following raw materials in parts by weight: 60-95 parts of nylon resin, 5-40 parts of ABS (acrylonitrile-butadiene-styrene) resin, 0.3-2 parts of lubricant, 5-20 parts of compatilizer, 0.2-1 part of antioxidant and 5-30 parts of amorphous red phosphorus. The flame-retardant composite material for 3D printing is free of halogen, and can not pollute the environment in the material combustion and use process; and under the interactions among the amorphous red phosphorus, ABS resin and other raw materials, the flame retardancy and toughness of the material are enhanced. The added lubricant lowers the friction factor of the composite material, improves the free mobility of the composite material, avoids the material decomposition caused by local overheating and enhances the appearance quality and surface smoothness of the product. When the flame-retardant composite material for 3D printing is used for 3D printing, the wire sprayed by the sprayer is smooth, and the printed product has high precision and favorable surface quality.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a flame-retardant composite material for 3D printing and a preparation method thereof. Background technique [0002] 3D printing is a popular name for additive manufacturing technology. It is a technology that produces three-dimensional entities by adding materials layer by layer through continuous physical layer superposition. Different from the traditional material removal processing technology, 3D printing technology can directly produce objects of any shape by adding materials based on computer graphics data without the need for original embryos and molds, which can effectively simplify the manufacturing process of products and shorten the development of products. cycles, improving efficiency and reducing costs. 3D printing technology has been widely used in product prototypes, mold manufacturing, artistic creation, jewelry making, bioengineering and medicine...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L77/02C08L77/06C08L55/02C08L51/00C08L83/04C08L35/06C08K13/02C08K3/02C08K5/09
CPCC08L77/02C08L77/06C08L2201/02C08L2205/02C08L2205/03C08L2205/035C08L55/02C08L51/003C08L83/04C08K13/02C08K2003/026C08L35/06C08K5/09
Inventor 陈梓煜邓世捷
Owner 陈梓煜
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