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Preparation method of in-situ polymerized type halogen-free flame retardant nylon material for selective laser sintering

A flame retardant nylon and laser sintering technology, applied in the field of additive manufacturing, can solve problems such as inability to form and process, poor flame retardant effect, and difficulty in preparing workpieces, and achieve the effects of reducing impact, saving reaction time, and protecting the environment

Inactive Publication Date: 2017-12-26
HUNAN FARSOON HIGH TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the flame retardant modification of nylon materials generally directly mixes flame retardants with nylon substrates by means of melt blending. Although this method can prepare nylon materials with flame retardant effects, the nylon materials can only be used in traditional injection molding industries. It cannot be applied to selective laser sintering, because it has many disadvantages as follows: 1. Poor mechanical properties and poor flame retardant effect; 2. When the synthetic material is used for selective laser sintering, it will not melt during sintering, and basically cannot be formed and processed. and other problems, that is, it is difficult to prepare workpieces

Method used

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  • Preparation method of in-situ polymerized type halogen-free flame retardant nylon material for selective laser sintering

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preparation example Construction

[0022] The invention provides a method for preparing an in-situ polymerization type halogen-free flame-retardant nylon material for selective laser sintering, comprising the following steps:

[0023] In-situ polymerization of nylon monomer, melamine, cyanuric acid, light absorber, molecular weight regulator, and primary antioxidant to obtain a halogen-free flame-retardant nylon material;

[0024] The halogen-free flame-retardant nylon material obtained above is pulverized to obtain halogen-free flame-retardant nylon powder for selective laser sintering.

[0025] In order to make the halogen-free flame-retardant nylon powder obtained above be better applied to selective laser sintering, that is, it has better light absorption effect and flame-retardant effect, and the mechanical properties of sintered parts are better. Preferably, the above-mentioned nylon Monomer, melamine, cyanuric acid, light absorber, molecular weight regulator, and first antioxidant are also added with wat...

Embodiment 1

[0033] (1) Add the raw materials caprolactam, melamine, cyanuric acid, benzoxazine, molecular weight regulator, antioxidant and deionized water into the reaction kettle. Wherein each component and its percentage by weight are as follows: the content of caprolactam is 88%, the content of melamine is 5%, the content of cyanuric acid is 5%, the content of benzoxazine is 0.1%, and the content of molecular weight regulator is 0.3%. The antioxidant content is 1%, and the deionized water content accounts for 20% of the total mass of the above raw materials; the reaction kettle is sealed and the gas in the kettle is removed, and then carbon dioxide gas is introduced to protect the pressure in the kettle to 0.15Mpa, and the temperature in the kettle is controlled to rise to 245°C , pressure to 1.6MPa, keep the pressure for 1 hour, then slowly release the air to normal pressure, raise the temperature in the kettle to 280°C and keep the reaction for 1 hour, stop heating, water-cool the st...

Embodiment 2

[0037] (1) Add raw materials PA66 salt, melamine, cyanuric acid, benzotriazole, molecular weight modifier, antioxidant and deionized water into the reaction kettle. Wherein each component and its percentage by weight are: PA66 salt content is 82%, melamine content is 8%, cyanuric acid content is 8%, benzotriazole content is 0.2%, molecular weight regulator is 0.6%, The antioxidant is 1.2%, and the deionized water content accounts for 30% of the total mass of the above-mentioned raw materials. Close the reaction kettle and remove the gas in the kettle, and then pass in carbon dioxide gas protection until the pressure in the kettle is 0.1MPa. Control the temperature in the kettle to 210°C, the air pressure to 1.5MPa, keep the pressure for 1.5 hours, then slowly release the gas to normal pressure, raise the temperature in the kettle to 270°C and keep the reaction for 1.5 hours, stop heating, water-cool the strips to discharge, cut pellets to obtain in-situ polymerized halogen-fr...

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Abstract

A preparation method of an in-situ polymerized type halogen-free flame retardant nylon material for selective laser sintering comprises the following steps: carrying out in-situ polymerization of nylon monomers, melamine, cyanuric acid, a light absorbent, a molecular weight regulator and a first antioxidant to obtain a halogen-free flame retardant nylon material; and crushing the halogen-free flame retardant nylon material to obtain a halogen-free flame retardant nylon powder. The prepared in-situ polymerized type halogen-free flame retardant nylon material for selective laser sintering not only makes a flame retardant chemically bonded into the nylon monomers or uniformly dispersed in the nylon monomers, so as to achieve a good flame retardant effect, namely meet the requirements of the aviation flame retardant standard FAR25.853; and because the light absorbent is added in the polymerization process and the light absorbent can be uniformly dispersed in a base material, the laser energy in the selective laser sintering process can be better absorbed, melt processing of materials can be effectively promoted, and thus the utilization rate of laser energy and the mechanical performance of sintering parts are improved.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing, and in particular relates to a preparation method of an in-situ polymerization type halogen-free flame-retardant nylon material for selective laser sintering. Background technique [0002] 3D printing technology is a general term for additive manufacturing technology. It is an advanced manufacturing technology with distinctive features such as digital manufacturing, high flexibility and adaptability, direct CAD model drive, fast speed, and rich and diverse material types. Establish a digital description model based on the combination information of structure, structure and selected materials, and then output this information to the computer-controlled electromechanical integrated manufacturing system for point-by-point, line-by-line, and surface-by-surface three-dimensional stacking to produce three-dimensional entities. Compared with the traditional subtractive manufacturing proce...

Claims

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Application Information

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IPC IPC(8): C08G69/16C08G69/26C08L77/02C08L77/06C08K5/3492C08K5/3475C08K5/357C08K3/36C08K3/22C08K5/13C08K5/20C08K5/526
CPCC08G69/16C08G69/26C08K3/22C08K3/36C08K5/13C08K5/20C08K5/3475C08K5/34922C08K5/357C08K5/526C08L77/02C08L77/06C08L2201/02C08L2201/22
Inventor 杨云龙陈礼文杰斌黄敏谭锐彭博
Owner HUNAN FARSOON HIGH TECH CO LTD
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